Post Fertilisation Structures and Events

Q.

What will be the ploidy of (i) embryo, (ii) perisperm and (iii) endosperm of seeds produced by a cross between a 4n female plant and a 2n male plant?

1. (i)-3n, (ii)-3n & (iii)-5n

2. (i)-3n, (ii)-4n & (iii)-5n

3. (i)-4n, (ii)-3n & (iii)-4n

4. (i)-2n, (ii)-2n & (iii)-3n

Q.

Why is maize grain usually called as a fruit and not a seed?

Q.

Name the parts of the flower that develops after fertilization into

(i) Seed (ii) Fruit

Q. Which of the following changes does not occur in the ovary after fertilisation in flowering plants?

1. Ovary wall $\to$ Pericarp
2. Integument $\to$ Seed coat
3. Ovule $\to$ Fruit wall
4. Ovary $\to$ Fruit

Q. (a) Fruits are developed from ovary but in some cases other parts of the flower also contribute to fruit formation. What are these fruits called? Give examples.
(b) How are parthenocarpic fruits formed? How can this condition be induced artificially? [3]

Q.

The phenomenon wherein, the ovary develops into a fruit without fertilisation is called

1. Sexual reproduction

2. Apomixis

3. al reproduction

4. Parthenocarpy

Q.

Are bryophytes oogamous?

Q. Ovule which is straight with funiculus, embryo sac, chalaza and micropyle lying on one straight line is called

1. Anatropous
2. Orthotropous
3. Amphitropous
4. Camylotrophous

Q. A fruit formed from a single flower with multiple ovaries is called

1. composite fruit
2. aggregate fruit
3. none of these
4. simple fruit

Q. Choose the odd one w.r.t. gynoecium.

1. Gynoecium represents the female reproductive part of flower
2. The gynoecium may be syncarpous or apocarpous
3. The number of ovules in papaya and mango is one
4. The ovules are attached to placenta

Q.

Name the parts of a pistil.

Q.

What is meant by naked embryos?

Q. Identify the wrong statement regarding post-fertilisation development.

1. The outer integument of ovule develops into tegmen
2. The ovary wall develops into pericarp
3. The ovule develops into seed
4. The primery endosperm nucleus develops into endosperm

Q. Maize grain is fruit and not a seed.

1. True
2. False

Q. What do you mean by double fertilization?

Q.

Define germination.

Q. Internodal elongation is stimulated by

1. auxin
2. cytokinin
3. phenol
   
4. gibberellin

Q. Differentiate between Integument and testa.

Q. Give the post fertilization changes in an angiospermic flower.

Q. Placentation in tomato and lemon is

1. parietal
2. free central
3. marginal
4. axile

Q. After fertilisation, an ovary develops into

1. embryo
2. seed
3. pericarp
4. fruit

Q.

Hilum absorbs water in a seed.

1. True
2. False

Q. Assertion :Strawberry is a false fruit because it is formed without fertilization. Reason: Apomixis is a type of sexual reproduction.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. Hilum of seed is

1. Scar of micropyle
2. Area through which pollen tube enters the ovule
3. Glandular and attractant region of ovule
4. Scar of funiculus

Q. Female gametophyte of angiosperms is represented by

1. Megaspore mother cell
2. Ovule
3. Embryo sac
4. Nucellus

Q. What occurs after double fertilisation?

1. Pollen grain germinates over stigma
2. Two male gametes are discharged into embryo sac
3. Pollen tube enters the embryo sac
4. PEN develops into endosperm

Q. Which among the following is a post-fertilisation event in angiosperms?

1. Embryogeny
2. Formation of endosperm
3. porogamy
4. Both a and b

Q. After fertilisation ovules develop into

1. embryo
2. seeds
3. pericarp
4. fruits

Q.

Fruits developing from an unfertilised ovary are

1. True fruits

2. False fruits

3. Accessory fruits

4. Parthenocarpic fruits

Q. Why do you think the zygote is dormant for sometime in a fertilised ovule?