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Germination of seeds - class-V

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Germination of the seed is promoted by.

  1. Green light

  2. Red light

  3. Blue light

  4. Infra red light


Correct Option: A

Renu soaked some moong seeds overnight in water. Next day, after draining out the water, she wrapped the seeds in a wet cloth. After a day, she observed small white structures growing out of the seeds. These small white structures will develop into

  1. Stems

  2. Roots

  3. Leaves

  4. Flowers


Correct Option: B
Explanation:

Sprouts develop in the pulses or grain under humid environment with adequate amount of water fasten the process of germination and Roots comes out.

So the correct option is 'Roots'.

Which of the following is a step which is involved in seed germination?

  1. Absorption of Water

  2. Absorption of Carbon Dioxide

  3. Absorption of Light

  4. All the above


Correct Option: A
Explanation:

Germination is the process of seeds developing into new plants. First, environmental conditions must trigger the seed to grow.

  1.  When water is plentiful, the seed fills with water in a process called imbibition. The water activates special proteins, called enzymes, that begin the process of seed growth. 
  2.  The seed grows a root to access water underground. 
  3. The shoot appears above ground. 

The seed sends a shoot towards the surface, where it will grow leaves to make food that provides energy. 
The leaves continue to grow towards the light source in a process called photomorphogenesis.
So the correct option is 'Absorption of Water'

Sprouting of potatoes while in storage can be prevented by _________________.

  1. Treatment with low concentrations of urea

  2. Treatment with low concentrations of naphthalene acetic acid

  3. Treatment with low concentrations of nicotinamide

  4. Exposure of sunlight and storage at low temperatures


Correct Option: A

In germinating oil seeds beta-oxidation of free fatty acids takes place in the _____________.

  1. Oleosomes

  2. Glyoxysomes

  3. Mitochondria

  4. Lysosomes


Correct Option: A

State whether the following statements are true or false.
Oxygen is not necessary for seed germination;

  1. True

  2. False


Correct Option: A
Explanation:

Aerobic respiration is respiration which occurs in the presence of oxygen. Aeration is the main phenomenon which helps in the germination of seed. Oxygen is absorbed by the cells which later gets transformed into energy for future uses. For better germination of seeds require oxygen, water, sunlight, and temperature.

So, the correct statement is 'True'.

Choose the correct answer from the alternatives given.
Seed germination is over when the:

  1. embryo sporophyte absorbs water

  2. embryo sporophyte resumes growth

  3. primary root pokes out of the seed coat

  4. cotyledons unfurl


Correct Option: C
Explanation:

In summary, seed germination is the process of a fertilized plant ovary, or seed, developing into a mature plant. Seed germination starts with imbibition when the seed takes in water from the soil. This triggers root growth to allow the seed to get more water.

So, the correct option is 'primary root pokes out of the seed coat'.

The chemical used for treating the dormancy of seed is?

  1. TTC

  2. G A

  3. I B A

  4. Methyl red


Correct Option: A

In wheat and rice _________________.

  1. Per carp is fused with seed coat

  2. Per sperm is fused with seed coat

  3. Seed coat and per carp are separate

  4. Fruits are multisided


Correct Option: A

Sprouting time of seeds may vary according to 

  1. Temperature

  2. Humidity of the weather

  3. Air force

  4. Both A and B


Correct Option: D
Explanation:
Sprouting time of seeds may vary according to the temperature and humidity of the weather. Some seeds are hard to germinate when the weather is hot. Sometimes the temperature is just too high for that seed, sometimes the soil dries out too fast. Some varieties of some crops have better germination at high temperatures than others.

So, the correct answer is 'Both A and B'.

Glycolate is converted into glyoxylate in the ___________.

  1. Glyoxomes

  2. Microtubules

  3. Peroximoses

  4. Golgi bodies


Correct Option: A

Consider the following statements.
a. The seeds of Zea mays would germinate immediately after falling from the plant if favourable conditions of moisture, temperature and aeration are available.
b. Seed-coat dormancy is exhibited by Cassia and Gossypium
Which of the statements given is/are correct?

  1. $1$ only

  2. $2$ only

  3. Both $1$ and $2$

  4. Neither $1$ nor $2$


Correct Option: A

How many meiotic divisions are required to produce 200 seeds?

  1. 50

  2. 100

  3. 200

  4. 250


Correct Option: A

State whether the following statements are true or false.
Seedlings grown for a few days in the dark often have lesser fresh weight and greater dry weight than those kept in light for a comparable period.

  1. True

  2. False


Correct Option: B
Explanation:

For the development of any seedling or plants, both light and dark phases are required for proper growth. The seedlings that are growing requires light as the carbon sources in them and the other nutrients are present in its complete amount but when they are placed in the darkness they are unable to perform certain functions so there is less production of nutrients resulting in lower fresh weight. Thus, the light phase is the phase on which growth of the plant is dependent upon. 

So, the correct statement is 'False'. 

The seeds respirate at the time of germination.White showing this experiment a test tube with KOH is kept in the conical flask to _____________. 

  1. Supply oxygen necessary for respiration.

  2. create space in the conical flask by absorbing $CO _3$.

  3. absorb water from the seeds and dry them

  4. make the air in the conical flask acidic


Correct Option: A

Which of the following members of spermatophyte is able to produce seed but not cones?

  1. Eucalyptus and Wolfia

  2. Pinus & Cycas

  3. Pteris & Dryopteris

  4. Eucalyptus & Pinus


Correct Option: A

During seed germination its stored food is mobilized by?

  1. Ethylene

  2. Cytokinin

  3. Abscisic acid

  4. Gibberellin


Correct Option: D
Explanation:

Gibberellins invigorate the combination of α-amylase and proteases compound in germinating grains of oats. They are associated with the transformation of starch into sugar. The proteases convert an inert β-amylase to the dynamic frame. The dynamic β-amylase and α-amylase together process starch to glucose which is prepared to meet the metabolic requests of developing life. 

So, the correct option is 'Gibberellin'.

During which of the following stages of seed development, the production and storage of energy in mitochondria increases? 

  1. Seed germination

  2. Dormant seed

  3. Development of seeds

  4. Seed formation


Correct Option: A
Explanation:
Seed germination is a vitality requesting process that requires. while the mitochondrial mass increments amid interphase. It is suggested that the biogenesis of mitochondria amid germination begins from the advancement. 
Thus, the correct option is 'Seed germination.'

Formation of seeds without fertilisation can take place by all except.

  1. Germination of vegetative propagule

  2. Apogamy

  3. Diplospory

  4. Sporophytic budding


Correct Option: A

In Euphorbia, there are $10$ cyathia inflorescence and each inflorescence contains $20$ flowers. One female flower produces $6$ seeds. Calculate the total number of seeds produced by $10$ cyathia.

  1. $10,,e1,,e6$

  2. $10,,e20,,e6$

  3. $10,,e20,,e20$

  4. $10,,e6,,e6$


Correct Option: A

When dry seeds are placed in wet soil 

  1. They absorb water

  2. They increase in size

  3. The hard seed coats get ruptured

  4. All of the above


Correct Option: D
Explanation:

When dry seeds are placed in wet soil they absorb water and increase in size because of this the hard seed coats get ruptured and process of germination of seed takes place.

Assertion : The two cotyledons in seed are embryonic leaves.

Reason : The embryo contains radicle and plumule.

  1. Both assertion and reason are true and reason is a correct explanation of the assertion.

  2. Both assertion and reason are true but reason is not a correct explanation of the assertion.

  3. Assertion is true but Reason is false

  4. Both Assertion and Reason are false

  5. Assertion is false but Reason is true


Correct Option: B
Explanation:

In angiosperms, cotyledons are embryonic leaves. Embryo also has radicle and plumule which gives rise to root and shoot respectively.

Assertion : Many plants are propagated vegetatively even through they bear seeds.

Reason : Potatoes multiply by tubers, apple by cutting.

  1. Both assertion and reason are true and reason is a correct explanation of the assertion.

  2. Both assertion and reason are true but reason is not a correct explanation of the assertion.

  3. Assertion is true but Reason is false

  4. Both Assertion and Reason are false

  5. Assertion is false but Reason is true


Correct Option: A
Explanation:

Vegetative reproduction is asexual type of reproduction Potato, Sugarcane, Apple, etc., are multiplied by asexual means.

In a seed of maize, scutellum is considered as cotyledon because it ________________.

  1. Protects the embryo

  2. Contains food for the embryo

  3. Absorbs food materials and supplies them to the embryo

  4. Converts itself into a monocot leaf


Correct Option: C
Explanation:

The scutellum can also be considered in equivalence to thin cotyledon in monocots. It is very thin with a high surface area. It serves to absorb nutrients from the endosperm during germination. But it is not meant for protection of the embryo. Also, scutellum is not able to convert itself into a monocot leaf.

The option C is correct.

At the time of seed germination, digestive enzymes are induced to be formed under the influence of

  1. Cytokinin

  2. Gibberellins

  3. Ethylene

  4. Auxin


Correct Option: B
Explanation:

Gibberellin is a plant hormone which breaks the seed dormancy. Before the germination, starch nourishes seedling. It stimulates the synthesis of digestive enzymes like amylase in the aleurone cells of certain cereals. Amylase hydrolyzes starch into glucose which is used to provide nourishment to the seed embryo. 

Thus, the correct answer is option B.

During germination, micropyle of seed takes part in

  1. Forming weak point for emergence of radicle

  2. Absorption of water

  3. Passage of gases

  4. Leaching inhibitors


Correct Option: B
Explanation:

Micropyle is a narrow pore or passage formed by the projection of the integuments through which the pollen tube enters into ovule. Seeds contain micropyle through which water enters into the seed during germination.

So, the correct answer is 'Absorption of water'.

During seed germination, seed coat ruptures due to

  1. Differentiation of cotyledons

  2. Massive glycolysis in endosperm and cotyledons

  3. Massive imbition of water

  4. Sudden increase in cell division


Correct Option: C
Explanation:

During the beginning stage of the germination, the seeds take up water rapidly and this results in swelling and softening of the seed coat at an optimum temperature. By rupturing of the seed coats helps to emerge the radicle and the plumule to form a primary root. This stage is referred to as an imbibition. So, the correct answer is 'Massive imbibition of water’.

Choose the correct statements

 For germination of angiospermic seeds ;
  1. On hydration the seed germinates showing increased enzyme activity
  2. Respiration rate of germinating seeds increases alongwith increased enzymatic activity
  3. Increase in respiratory rate continues till senescence
  4. Rate of enzymatic activity increases

  1. 1, 2, 3

  2. 1 and 2

  3. 2, 4

  4. 1 and 3


Correct Option: B
Explanation:

Seed germination is a fundamental process by which plant species grow from a single seed. One common example of seed germination is the sprouting of the seed of an angiosperm or gymnosperm. During its beginning stage, the seeds take up water for hydration. It is also used as a part of the aerobic respiration that also is a result of increased enzymatic activity.

The correct statements are 1 and 2 only.

The correct option is B.

Part of the seed which forms the shoot at the time of germination is

  1. Radicle

  2. Cotyledons

  3. Epicotyl

  4. Plumule


Correct Option: D
Explanation:

A. Radicle- It is a embryonic root, which form root at the time of germination.

B. Cotyledons- It store reserve food materials or serve as photosynthetic organs in young seedling.
C. The upper portion of the axis above the cotyledons.
D. Plumule - It is a shoot tip which form shoot at the time of germination.
So, the correct answer is 'Plumule'.

In ______________ seed germination epicotysis elongates and cotyledons lie below soil surface.

  1. Viviparous

  2. Hypogeal

  3. Epigeal

  4. None of these


Correct Option: A

A germinating mustard seed converts its lipids into sugars by _______________.

  1. TCA cycle

  2. Glyoxylate cycle

  3. Calvin cycle

  4. Glycotate pathway


Correct Option: A

Which of the following processes involved are true of the germinating seed?
a. Imbibitions of water
b. Evolution of oxygen
c. Synthesis of enzymes
d. Emergence of radical
Select the correct answer using the codes given.

  1. $1, 2$ and $3$

  2. $1, 3$ and $4$

  3. $2, 3$ and $4$

  4. $1$ and $2$


Correct Option: A

In the mature seed the persistent outer layer of nucleolus is called.

  1. Perisperm

  2. Caruncle

  3. Endostome

  4. Endothelium


Correct Option: A

The alkaloid emetine is extracted from the.

  1. Seeds of Strychnos

  2. Roots of Aconitum

  3. Seeds of Datura

  4. Roots of Cephalous


Correct Option: A

Which of the following statements about the hypocotyl hook is not true?

  1. It develops below the attachment of the cotyledons

  2. It is the first structure to emerge from a dicot seed

  3. It precedes the cotyledons and shoot apex up through the soil

  4. It straightens when exposed to light


Correct Option: B
Explanation:

An embryo is a portion of a seed that grows into a plant. An embryo is a basic element that possesses enough potential for further growth and development. The part of a plant embryo or seedling that lies between the radicle and the cotyledons is the hypocotyl. Upon germination, the hypocotyl pushes the cotyledons above the ground to develop. It eventually becomes part of the plant stem. Most seed-bearing plants have hypocotyls.

So the correct option is 'It is the first structure to emerge from a dicot seed'.

After soaking the seeds overnight, these changes are seen in it 

  1. Stored food is digested to soluble form

  2. Physiological activity increases

  3. Imbibition of water occurs

  4. All of the above


Correct Option: D
Explanation:

When seeds soaked in water, water gets absorbed with increasing its volume, the physiological activity the seed also increases along with the metabolic activities and the food gets digested.

So the correct option is 'All of the above.'

Freshly liberated seeds of Erianthus hiemalis do not germinate due to

  1. Occurrence of impermeable seed coat

  2. Immaturity of embryo

  3. Occurrence of inhibitors

  4. Absence of growth hormones


Correct Option: B
Explanation:

Immaturity of embryo prevents germination of freshly liberated seeds of Erianthus hiemalis. 

So, the correct answer is 'Immaturity of embryo'

In a germinating seed, the roots develop from

  1. Radicle

  2. Plumule

  3. Tegmen

  4. Hilum


Correct Option: A
Explanation:

The radicle is the first part of a seedling to emerge from the seed during the process of germination. It is the embryonic root of the plant and grows downward in the soil.

Hence, the correct answer is 'Radicle'.

Choose the correct answers from the alternatives given.
The following are requirement of seeds for germination to occur:

  1. oxygen for increased metabolism

  2. adequate temperature

  3. adequate water

  4. all of these


Correct Option: D

Choose the correct answer from the alternatives given.
A nail was driven into the trunk of a tree at a point 1.5 meters above the soil level. After three years, the nail will

  1. remain where it was

  2. move side ways

  3. move up

  4. move down


Correct Option: A
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