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Vernalisation - class-XI

Description: vernalisation
Number of Questions: 53
Created by:
Tags: growth and development plant growth biology plant growth and development
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Vernalization can remove Kernel wrinkles in:

  1. Wheat

  2. Petkus rye

  3. Maize

  4. Rice


Correct Option: A
Explanation:
  • Vernalisation is defined as the qualitative or quantitative dependence of plants on exposure to a low temperature to flower. Temperature affects flowering, metabolic activities, and germination of seeds in plants. Plants that grow in mild weather germinate at low temperatures whereas those that grow in hot regions germinate at high temperatures. 
  • Some plants need exposure to a low temperature to germinate. Furthermore, a plant can be induced to flower in a growing season by exposing it to low temperature. Therefore, it shortens the vegetative phase and hastens flowering in plants. 

So, the correct answer is A.

Vernalization is subjected to plants growing in 

  1. Tropical areas

  2. Sub tropical

  3. Temperate areas

  4. Hot areas/Arctic region


Correct Option: C
Explanation:
Vernalization refers to the phenomenon of inducing flowering in plants by subjecting them to prolonged cold temperatures. After vernalization, plants acquire the ability to flower. Vernalization is subjected to plants growing in Temperate(temperature in these regions is moderate) areas.
So, the correct answer is 'Temperate areas'.

Which of the following is not true regarding vernalisation

  1. Its a temperature dependent phenomenon

  2. Its a light dependent phenomenon

  3. It prevents precocious reproductive development

  4. Its an aerobic process


Correct Option: B
Explanation:

The process of induction of flowering in plants, by exposing seeds at low temperature for prolonged periods is called Vernalisation. It is an aerobic, temperature dependent phenomena, prevents precocious reproductive development. It does not depend on light.

So, the correct answer to the question is ‘vernalisation is not a light dependent phenomena’.

Vernalization is a phenomenon which concerns 

  1. Low temperature requirement for flowering in plants

  2. Migration of birds from their winter homes to summer habitats

  3. Immunization of infants against the common infectious diseases

  4. Entering of cold blooded animals into an inactive state in winter


Correct Option: A
Explanation:

Vernalization is the acquisition of a plant's ability to flower in the spring by exposure to the prolonged cold of winter, or by an artificial equivalent. Many plants grown in temperate climates require vernalization and must experience a period of low winter temperature to initiate or accelerate the flowering process. This ensures that reproductive development and seed production occurs in spring and summer, rather than in autumn.

Chemical agent that has important role in flowering is

  1. Fluorocarbon

  2. GA${ _3}$

  3. Florigen

  4. Auxins


Correct Option: C
Explanation:
a) Fluorocarbon is a compound containing only carbon and fluorine. These compounds can be used as refrigerants, solvents, and anesthetics.
b) Gibberellic Acid or GA$ _3$ is a plant hormone which regulates various developmental processes, including stem elongation, germination, dormancy, flowering, flower development and leaf and fruit senescence.
c) Florigen also called flowering hormone is the hypothesized hormone-like molecule responsible for flowering in plants.
d) Auxins are a class of plant hormones responsible for stem elongation and maintaining apical dominance.
So the correct answer is C.

What is vernalisation?

  1. Growth curve in response to light

  2. Recurrence of day and night

  3. Effect of day length on plant growth

  4. Acceleration of the ability to flower by low temperature treatment


Correct Option: D
Explanation:

 Vernalization is the process of induction of flower by prolonged exposure to cold temperature. It is an adaptation shown by plants which are exposed to harsh winter followed by relatively short growing seasons. Vernalization is practiced artificially too.

Vernalization treatment can convert

  1. A biennial into an annual

  2. A spring variety into a winter variety

  3. An annual into a perennial

  4. All of these


Correct Option: D
Explanation:

Vernalization is the process of inducing flowering to a plant by exposing the plant to cold of winter or through artificial processes. The process of Vernalization converts a biennial into an annual and spring variety into a winter variety and an annual into a perennial.

So the correct option is 'All of these.'

Vernalization is

  1. Growth curve related to light

  2. Effect of photoperiods on plant growth

  3. Speeding up ability to flower by low temperature

  4. Diurnal photoperiodicty


Correct Option: C
Explanation:

In many plants, the temperature has a profound effect on flowering. Some plants do not flower under the inductive photoperiod conditions but flower when a cold temperature treatment is given to them. This acquisition or acceleration of the ability to flower by a chilling treatment is said to be vernalization. It is the method of inducing early flowering in plants by pretreatments of their seeds at a very low temperature. Thus option C is the correct answer. 

The pathway leading to flowering for plants that requires vernalization is the

  1. Seasonal pathway

  2. Light dependent pathway

  3. Temperature dependent pathway

  4. None of the above


Correct Option: C

Which of the following can shorten the vegetative period of plants?

  1. Vernalization

  2. Apical meristem

  3. Germination

  4. All of the above


Correct Option: A

Vernalization stimulates flowering in

  1. Turmeric

  2. Carrot

  3. Yam

  4. Ginger


Correct Option: B

The application of vernalization is

  1. Crop improvement

  2. Resistant to fungal disease

  3. Reduces cost of production

  4. All of the above


Correct Option: D
Explanation:


Vernalization (from Latin vernus, "of the spring") is the induction of a plant's flowering process by exposure to the prolonged cold of winter. After vernalization, plants have acquired the ability to flower. Through this process the quality of the crops can be improved, it helps to keep away the plants from the fungal disease and also helps to reduce the cost of the production.
So, the correct answer is option D.

The phenomena of vernalization is discovered by the

  1. Gassner

  2. Lysenko

  3. Pristely

  4. None of the above


Correct Option: A

Which of the following can converts winter variety crop plants into spring variety?

  1. Photoperiodism

  2. Vernalization

  3. Differentiation

  4. Sacrification


Correct Option: B
Explanation:

During spring season the cool-season crops plants have enough time to reach maturity before the weather turns warm. Vernalization if the process of cooling the seed to germinate and induce flowering process.

So the correct option is 'Vernalization.'

Flowering time can be changed through

  1. Vernalization

  2. Apical meristem

  3. Germination

  4. All of the above


Correct Option: A
Explanation:

Vernalization if the process of artificial induction of plant's flowering process which is discovered by Gassner and flowering time also changed by external factors.

So the correct option is 'Vernalization.'

The duration of cold treatment in vernalisation varies from

  1. Four days to four weeks

  2. Four days to ten days

  3. Four days to three months

  4. One month to three months


Correct Option: C
Explanation:

The acquisition or acceleration of the ability to flower by a chilling treatment is said to be vernalization. It is the method of inducing early flowering in plants by pretreatments of their seeds at a very low temperature. Low-temperature effects may be obtained at any stage of plant development. The most effective temperature for vernalization is between 0 to 5 degree C. The duration of cold treatment for effective vernalization varies from four days to eight weeks. Thus option C is the correct answer. 

Which of the following hormones can replace vernalization?

  1. Auxin

  2. Ethylene

  3. Gibberellins

  4. Cytokinins


Correct Option: C
Explanation:

Vernalization is the acquisition of a plant's ability to flower in the spring by exposure to the prolonged cold of winter, or by an artificial equivalent. It can also refer to herbal plants requiring a cold dormancy to produce new shoots and leaves. The stimulus of vernalization is known as vernalin. The stimulus of vernalization that induce flowering could be a particular gibberellin or a mixture of gibberellins.

The physiological process that compensate the effect of thermophase in plant is

  1. Vernalization

  2. Apical meristem

  3. Germination

  4. All of the above


Correct Option: A

The term vernalization was first introduced by

  1. G. Haberlandt

  2. T D. Lysenko

  3. Kurosawa

  4. Dickens


Correct Option: B
Explanation:
  • Vernalization is a method in which the seeds or the plants are exposed to certain treatments in order to initiate the process of flowering. 
  • Generally, the plants are exposed to cold treatment, which induces the plants to produce flowers. 
  • This term was introduced by T. D. Lysenko in the year 1920.
  • Thus, the correct answer is option B. 

Perianth in the spike let of jawar  is represented by

  1. Lodicules

  2. Sepals and petals

  3. Glumes

  4. Lemma and palea


Correct Option: A
Explanation:

Lodicules are two scale like structures that lie at the  base of the ovary of  a grass flower including jawar .

Flowering dependent on cold treatment is

  1. Cryotherapy

  2. Cryogenics

  3. Cryoscopy

  4. Vernalisation


Correct Option: D
Explanation:

Vernalization is the process by which plant can be induced to flower by exposing it to the prolonged cold or winter. The term was coined by Lysenko in 1928. He stated that certain plants can be made to flower by providing cold treatment to young plants or moistened seeds.

Thus, the correct answer is option D.

Vernalisation is

  1. Growth curve related to light

  2. Effect of photoperiods on plant growth

  3. Speeding up ability to flower by low temperature treatment

  4. Diurnal photoperiodicity


Correct Option: C
Explanation:

Vernalization is the process by which plant can be induced to flower by exposing it to the prolonged cold of winter. The term was coined by Lysenko in 1928. He stated that certain plants can be made to flower by providing low temperature treatment to young plants or moistened seeds. Other terms like jarovization, springification were also coined for the same phenomenon. However, today the most accepted term is vernalization.

Thus, the correct answer is option C.

Low temperature treatment of some semigerminated seeds for some period often induces subsequently quicker flowering in plants. This process is called

  1. Vernalization

  2. Thermolysis

  3. Wintering

  4. Devernalization


Correct Option: A
Explanation:

Vernalization is the process by which plant can be induced to flower by exposing it to the prolonged period of low temperature or cold. After this, plants show quicker flowering. The term was coined by Lysenko in 1928. He stated that certain plants can be made to flower by providing low temperature treatment to young plants or semigerminated seeds.

Thus, the correct answer is option A.

The practice of subjecting seeds to low temperatures for a period of time in order to cause growth and flowering during summer season is called as 

  1. Wintering

  2. Vernalization

  3. Devernalization

  4. Thermolysis


Correct Option: B
Explanation:

Vernalization is the artificial exposure of plants to low temperatures in order to stimulate flowering or to enhance seed production. By satisfying the cold requirement of many temperate zone plants, flowering can be induced to occur earlier than normal or in warm climates lacking the requisite seasonal chilling.

The process of vernalisation is

  1. Aerobic

  2. Anaerobic

  3. Unaffected by aerobic or unaerobic conditions

  4. Dependent upon starvation conditions


Correct Option: A
Explanation:

Vernalization is the process by which plant can be induced to flower by exposing it to the prolonged cold or winter. The term was coined by Lysenko in 1928. He stated that certain plants can be made to flower by providing low temperature treatment to young plants or moistened seeds. It is an aerobic process and requires metabolic energy obtained from oxygen.

Thus, the correct answer is 'Aerobic'.

Vernalisation promotes flowering in response to

  1. High light intensity

  2. Low temperature

  3. High temperature

  4. Low light intensity


Correct Option: B
Explanation:

Vernalization is the process by which plant can be induced to flower by exposing it to the prolonged cold of winter. The term was coined by Lysenko in 1928.  He stated that certain plants can be made to flower by providing low temperature treatment to young plants or moistened seeds. Other terms like jarovization, springification were also coined for the same phenomenon. 

Thus, the correct answer is option B.

The term "vernalisation" was coined by

  1. Garner and Allard

  2. Darwin

  3. Geoffery

  4. Lysenko


Correct Option: D
Explanation:

Vernalization is the process by which plant can be induced to flower by exposing it to the prolonged cold or winter. The term was coined by Lysenko in 1928. He stated that certain plants can be made to flower by providing low temperature treatment to young plants or moistened seeds.

Thus, the correct answer is option D.

Hormone responsible for vernalization is

  1. Florigen

  2. Colchicine

  3. Abscisin

  4. Vernalin


Correct Option: D
Explanation:

Vernalization is the process by which plant can be induced to flower by exposing it to the prolonged cold of winter. Plants can be made to flower by providing low temperature treatment to young plants or moistened seeds. Vernalin is a plant hormone that is produced on vernalization. It induces flowering in plants.

Thus, the correct answer is option D.

Low temperature treatment to speed up the process of flowering is referred to as

  1. Photoperiodism

  2. Vernalisation

  3. Thermoperiodism

  4. Hydroponics


Correct Option: B
Explanation:
Vernalisation is the process of shortening of the juvenile or vegetative phase and hastening flowering by a previous cold treatment. In vernalization by cold treatment, winter varieties are transferred into spring or summer varieties. The site of vernalization is apical meristem or all the meristematic cells e.g., shoot tip, embryo tips, root apex etc.  The low temperature required for vernalization is usually $0^o-5^oC$. As a result of vernalization, a flowering hormone called vernalin is formed (reported by Melchers), but vernalin has never been isolated.
So the correct option is 'vernalization'.

Which one hastens flowering in plants?

  1. Stratification

  2. Scarification

  3. Vernalisation

  4. Water deficit


Correct Option: C
Explanation:

Vernalisation is the process of that hastens to flower in plants by cold treatment. With the help of artificial cold treatment, winter wheat seeds can be induced to flower. 

Thus, the correct answer is option C.

Which of the following statements regarding photoperiodism is false?

  1. The response of plants to periods of light/day is termed as photoperiodism

  2. The shoot apices cannot perceive photoperiods

  3. In day neutral plants there is no correlation between exposure to light duration and induction of flowering response

  4. Shoot apices modify themselves into flowering apices prior to flowering

  5. The site of perception of light/dark duration is the flower


Correct Option: E
Explanation:
Photoperiodism is the response of plants to photoperiods, that is the length of day and night. During photoperiodism, shoot apices modify themselves into flowering apices prior to flowering. However, they do not perceive photoperiods. Rather, the site of perception of light and dark duration are leaves. In day-neutral plants, induction of flowering response does not depend on exposure to light duration. The site of perception of light/dark duration is the leaves.
So, the correct answer is 'The site of perception of light/dark duration is the flower'.

Which is incorrect statement?

  1. There are no mesodermal cells in pseudocoelomates

  2. There is no body cavity in first triploblastic animals

  3. There is no second opening in diploblastic animal gut

  4. There is no co-ordination between cells of sponges


Correct Option: A
Explanation:

Animals have a pseudocoelom that means  “false cavity”, which is a fluid-filled body cavity. Tissue derived from mesoderm partly lines the fluid-filled body cavity of these animals. It is mainly found in Nematoda.

So the correct option is 'There are no mesodermal cells in pseudocoelomates'

Seeds of winter varieties are benefitted by technique

  1. Senescence

  2. Photoperiodism

  3. Vernalisation

  4. Abscission


Correct Option: C
Explanation:

Vernalisation is the phenomena in which flowering is induced in the plant by exposing it to low temperatures. Seeds of winter varieties will flower only when they are exposed to cold period early in their development. Artificially, flowering can be induced in spring as well if they are exposed to artificial vernalization. 

Thus, the correct answer is option C.

Vernalisation is seen in

  1. Sugarbeet

  2. Carrot

  3. Cabbage

  4. All the above


Correct Option: D
Explanation:

Vernalization is the process by which plant can be induced to flower by exposing it to prolonged cold or winter. The term was coined by Lysenko in 1928. He stated that certain plants can be made to flower by providing low-temperature treatment to young plants or moistened seeds. Sugarbeet, carrot are biennial plants that require vernalization for flowering.

Thus, the correct answer is option D.

The stimulus of cold treatment (vernalisation) is perceived by

  1. Leaves

  2. Flowers

  3. Roots

  4. Shoot apices


Correct Option: D
Explanation:
Vernalisation is the conversion of winter variety into spring variety by chilling treatment or low temperature. Treatment with low temperature (0-4°C) leads to shortening of vegetative phase and initiation of reproductive phase. The stimulus of cold treatment is perceived by shoot tips, embryo tips and other meristematic regions pf the plant.
So, the correct answer is 'Shoot apices'.

Apple requires a low temperature for flowering and fruiting

  1. 10$^o$ C

  2. 7$^o$ C

  3. Below 7$^o$ C

  4. 10$^o$ - 15$^o$ C


Correct Option: C
Explanation:

Apple grows in low temperature for germination it needs more time as earlier stages are less tolerant to low temperature but flowering starts at the temperature which is around 7 degree or below it that means it needs extreme cold climate to grow.

So the correct option is 'Below $7^o$ C'.

The term 'Yarovization' was coined by

  1. Lysenko

  2. Klebs

  3. Yabuta

  4. Kogl and Haagen-Smit


Correct Option: A
Explanation:

Yarovization is the process by which plant can be induced to flower by exposing it to the prolonged cold of winter. After this, plants show flowering. The term was coined by Lysenko in 1928.  He stated that certain plants can be made to flower by providing low temperature treatment to young plants or moistened seeds. Other terms like vernalization, jarovization, springification were also coined for the same phenomenon. However, today the most accepted term is vernalization.

Thus, the correct answer is A 'Lysenko'

Potato is _________ for flower formation but _________ for tuberisation.

  1. LDP, SDP

  2. SDP, LDP

  3. LDP, day neutral

  4. SDP, day neutral


Correct Option: A
Explanation:

In the case of potato, it requires more photoperiod to induce flowering. Whereas for the formation of tuber, it requires very less photoperiod. Thus, it is told that potato is LDP for inducing flowering; but SDP for tuber formation. The flower-inducing florigen and tuber-inducing tuberigen signals are functionally exchangeable. Flowering and tuberization are distinct reproduction strategies, both of which involve the sensing of the photoperiod and generation of a signal in the leaves (process called as induction), the subsequent transport of the signal (known as florigen or tuberigen), and the response in a distant organ, the vegetative meristem, or stolon tips (also called evocation).

Cabbage is a biennial plant which produces flowers in the second year of growth. In an attempt to make it flower in a single year, four potted plants (I, II, III, and IV) of cabbage were subjected to different temperatures for several days given in the table.

Potted plant Temperature
I $5^o C$
II $20^o C$
III $30^o C$
IV $25^o C$

Which potted plant will show flowering?

  1. I

  2. II

  3. III

  4. IV


Correct Option: A
Explanation:
The low temperature required for vernalization is usually $0^o-5^oC$. In nature, the plants requiring vernalization are commonly biennials (e.g., cabbage, sugar canes), which complete their life cycle in two years. They germinate and grow vegetatively in the first year and produce flowers in the second year of growth. These plants fulfill their cold requirement during winters. However, such-biennial plants can be made to flower in one growing season by providing low-temperature treatment (i.e., $0^o-5^oC$ temperature) to young plants or moistened seeds.
So the correct answer is 'I'.

Biennials get changed into annuals by

  1. Hormones

  2. Photoperiodism

  3. Grafting

  4. Vernalisation


Correct Option: D
Explanation:
Vernalization is the process by which plant can be induced to flower by exposing it to the prolonged cold or winter. The term was coined by Lysenko in 1928. He stated that certain plants can be made to flower by providing low temperature treatment to young plants or moistened seeds. Biennial plants are changed into annual plants by the process of vernalisation and induces flowering.
Thus, the correct answer is option D.

It has been observed that after-effects of low temperature treatment are helpful in promoting the flowering in certain plants. Through this the vegetative period of plants becomes short and early flowering takes place. This phenomenon is known as

  1. Vernalisation

  2. Florignation

  3. Photoperiodism

  4. Heliotropism


Correct Option: A
Explanation:

Vernalization is the induction of a plant's flowering process by exposure to the prolonged cold of winter, or by an artificial equivalent. After vernalization, plants have acquired the ability to flower, but they may require additional seasonal cues or weeks of growth before they will actually flower. Vernalization is sometimes used to refer to herbal (non-woody) plants requiring a cold dormancy to produce new shoots and leaves but this usage is discouraged. Many plants grown in temperate climates require vernalization and must experience a period of low winter temperature to initiate or accelerate the flowering process. This ensures that reproductive development and seed production occurs in spring and winters, rather than in autumn. The needed cold is often expressed in chill hours. Typical vernalization temperatures are between 5 and 10 degrees Celsius (40 and 50 degrees Fahrenheit).

So the correct option is 'vernalisation'.

Which of the following hormones can replace vernalisation?

  1. Auxin

  2. Cytokinin

  3. Gibberellins

  4. Ethylene


Correct Option: C
Explanation:

Vernalization is the process by which plant can be induced to flower by exposing it to the prolonged period of low temperature or cold. After this, plants show quicker flowering. Gibberellic acid is a plant hormone which helps in growth of stem. It also brings about the rapid flowering in plants.

Thus, the correct answer is option C.

Low temperature is required in apple for a duration of

  1. 800 hours

  2. 400 hrs

  3. 200 hrs

  4. 100 hrs


Correct Option: A
Explanation:

Apple is able to grow in low temperature the earlier stages have less tolerance of lower temperature than the later stages and it requires around 800 hours for growth.

So the correct option is '800 hours'

The phenomenon which shortens vegetative period and hastens flowering is

  1. Etiolation

  2. Vernalisation

  3. Photoperiodism

  4. Parthenocarpy


Correct Option: B
Explanation:

Etiolation is a condition in which plant is grown in the partial or complete absence of light. The leaves are tiny and yellow in color. Vernalization is the process by which plant can be induced to flower by exposing it to the prolonged cold or winter. It shortens the vegetative period and hastens the flowering. Photoperiodism is the phenomenon in which various physiological reactions like flowering response to the relative length of day and night.

Thus, the correct answer is option B.

Nitrate reductase enzyme forms?

  1. $N _2$

  2. Amino acids

  3. $NCT _2$

  4. $NO^- _3$


Correct Option: A

Citrus canker is caused by.

  1. Alter aria citric

  2. Xanthamonas citric

  3. Diaporthe citric

  4. Phytophthora citrophthora


Correct Option: A

The compound pollen grain, massula is characteristic of ____________.

  1. Papilionaceae

  2. Caesalpiniaceae

  3. Mimosaceae

  4. Proteaceae


Correct Option: A

Pseudo-embryo sacs present in.

  1. Cyperaceae

  2. Poaceae

  3. Podostemonaceae

  4. Solanaceae


Correct Option: A

Fragrant flowers with well developed nectaries are an adaptation for _______.

  1. Hydrophily

  2. Anemophily

  3. Entomophily

  4. None of these


Correct Option: C
Explanation:

Entomophilous flowers produce an odour which many be pleasant (e.g., jasmine) or foul(e.g., Aristolochia, Arum Rafflesia). Smell and nectar attract flies and other insects.

Clay and humic acid particles hold tightly.

  1. Nitrate ions

  2. Ammonium ions

  3. Nitrite ions

  4. Molecular nitrogen


Correct Option: A
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