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Reproduction and Development in Plants

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Pollen tube enters into the ovule through the micropyle. What is this entrance known as?

  1. Mesogamy

  2. Porogamy

  3. Chalazogamy

  4. Apogamy

  5. None of these


Correct Option: B
Explanation:

Pollen tube enters into the ovule through the micropyle. This entry is known as Porogamy.

A new plant develops from a tissue or structure that drops or is separated from the parent plant. This process is known as _________.

  1. parthenogenesis

  2. exocytosis

  3. nodal growth

  4. vegetative propagation

  5. endocytosis


Correct Option: D
Explanation:

A new plant develops from a tissue or structure that drops or is separated from the parent plant. This process is known as Vegetative propagation.

__________ is unique to the seed of monocot.

  1. Coleoptiles

  2. Radicle

  3. Seed coat

  4. Endosperm

  5. Hilum


Correct Option: A
Explanation:

Coleoptiles is unique to the seed of monocot. Coleoptile is the pointed protective sheath covering the emerging shoot in monocotyledons such as oats and grasses.

How can you best define a pollen grain?

  1. The male gamete

  2. The female gamete

  3. The microspore mother cell

  4. The partially developed embryo

  5. The partially developed male gametophyte


Correct Option: E
Explanation:

A pollen grain is a partially developed male gametophyte.

What does scutellum represent in a maize grain?

  1. A shield - shaped cotyledon

  2. A protective covering of the radicle

  3. A protective covering of the plumule

  4. An endosperm

  5. A microspore mother cell


Correct Option: A
Explanation:

The scutellum represents a shield - shaped cotyledon in a maize grain.

Which of the following is a correct pair?

  1. Ovule - Egg

  2. Pollen grain - Sperm

  3. Seed - zygote

  4. Embryo sac - female gametophyte

  5. Ovary - gametophyte


Correct Option: D
Explanation:

This pair is correctly matched. Embryo sac is the female gametophyte.

Where is the shoot apical meristem in a dicot embryo located?

  1. Within the root apex

  2. Between the two cotyledons

  3. Around the suspensor

  4. In the endosperm

  5. Within the shoot apex


Correct Option: B
Explanation:

The shoot apical meristem in a dicot embryo is located between the two cotyledons.

From which structure does the seed coat develops after fertilization?

  1. Secondary nucleus

  2. Antipodal cells

  3. Egg cells

  4. Synergids

  5. Integuments


Correct Option: E
Explanation:

The seed coat develops from inner and outer integuments after fertilization.

Tapetum is the inner-most layer of the anther wall. It _____________.

  1. provides nutrition

  2. provides protection

  3. helps in respiration

  4. provides mechanical support

  5. helps in dehiscence


Correct Option: A
Explanation:

Tapetum is the inner-most layer of the anther wall. It provides nutrition.

Which of the following is NOT an example of artificial propagation?

  1. Fragmentation

  2. Production of fruit without fertilization in parthenocarpic plants

  3. Apomixis

  4. Grafting

  5. None of these


Correct Option: B
Explanation:

It is not an example of artificial propagation, because no fruit can be produced without fertilization in parthenocarpic plants.

Which of the following is a necessary condition, needed by almost all seeds to break dormancy?

  1. Imbibition

  2. Exposure to light

  3. Abrasion of the seed coat

  4. Exposure to cold temperatures

  5. Exposure to hot temperatures


Correct Option: A
Explanation:

Imbibition is a necessary condition, needed by almost all seeds to break dormancy.

If the endosperm of an angiosperm contains 36 chromosomes, the number of chromosomes in the root tip cells will be _________.

  1. 9

  2. 18

  3. 24

  4. 36

  5. 48


Correct Option: C
Explanation:

The number of chromosomes in the root tip cells will be 2/3rd of the chromosomes present in the endosperm of an angiosperm. Hence, the correct answer is 24 chromosomes.

Which of the following statements is NOT correct regarding the Hypocotyl hook?

  1. It develops below the attachment of the cotyledons.

  2. It straightens when exposed to light.

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

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

  5. All of these


Correct Option: C
Explanation:

Hypocotyl hook is not the first structure to emerge from a dicot seed. Hence,  this statement is wrong.

Which of the following is the most significant feature of the Vegetative propagation?

  1. It is an ancient practice.

  2. It enables rapid production of genetic variation.

  3. It ensures that the progeny are safe from attack of diseases and pests.

  4. It is a modern practice.

  5. It is a means of producing a large population of individuals genetically identical to the parents.


Correct Option: E
Explanation:

It is the most significant feature of vegetative propagation.

What exactly is a fruit?

  1. Ripened ovule

  2. Matured integuments

  3. Seed plus its integuments

  4. Ripened ovary

  5. Fused carpel


Correct Option: D
Explanation:

A fruit is a ripened ovary.

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