Sexual Reproduction in Flowering Plants

Q. What is the function of a flower?

Q.

Which part of the flower attracts insects for pollination?

1. Ovary
2. Petals
3. Stigma
4. Pollen

Q.

Draw a neat diagram showing fertilization in a flower and label (a) Pollen tube (b) Male germ cell and (c) Female germ cell, on it. Explain the process of fertilization in a flower. What happens to the ovary and ovule after fertilization?

Q.

Which part of the plant turns to fruit?

Q.

(a) Draw a neat sketch of the stamen of a flower. Mark in it filament and anther.
(b) Draw a neat sketch of the carpel of a flower. Mark in it stigma, style and ovary.
(c) What is made in (i) anther, and (ii) ovary, of a flower ?

Q. The pollen tube enters the ovule through a small opening called

1. Endosperm
2. Micropyle
3. Synergid
4. Pedicel

Q.

Find the odd one out in each group and give reasons for your choice.

1. Pollen

2. Ovule

3. Anther

4. Filament

Q.

Which of the following statements about flowers are true?

(i) Flowers are always bisexual.

(ii) They are the sexual reproductive organs.

(iii) They are present in all groups of plants.

(iv) After fertilization, they give rise to fruits.

1. (i) only

2. (iii) only

3. (i) and (iii)

4. (ii) and (iv)

Q.

(a) What is meant by 'unisexual flowers' and 'bisexual flowers' ? Give two examples of each.
(b) What is pollination? How does pollination occur?
(c) Describe the process of fertilisation in a flower with the help of labelled diagrams.
(d) What changes take place in the flower after fertilisation which leads to the formation of seeds and fruit?

Q.

After fertilisation, the ovule is converted into seed and ovary into fruit.

1. True

2. False

Q.

Papaya is monoecious plant.

1. True
2. False

Q.

In a flower, the parts that produce male and female gametes are respectively :
(a) sepal and anther
(b) filament and stigma
(c) anther and ovary
(d) stamen and style

Q. An embryo of a seed consists of radicle, plumule and cotyledons.

1. True
2. False

Q.

(a) Draw a neat diagram of a flower showing its various parts. In this diagram mark stem, receptacle, sepals, petals, stamen and carpel.
(b) What name is given to (i) all the petals of a flower, and (ii) all the sepals of a flower?
(c) What are (i) stamen, and (ii) carpel, in a flower?
(d) What is the other name of carpel of a flower?
(e) What is the name of the yellow powdery substance present in the anther of a flower?

Q.

Pollen grains are produced in:

1. ovary

2. stigma

3. anther

4. petal

Q.

Question 10
The correct sequence of reproductive stages seen in flowering plants is

(a) gametes, zygote, embryo, seedling
(b) zygote, gametes, embryo, seedling
(c) seedling, embryo, zygote, gametes
(d) gametes, embryo, zygote, seedling

Q. What are the reproductive organs in a flower?

Q.

Megasporophyll of cycas has the same nature as

1. Petal

2. Stamen

3. Carpel

4. Sepal

Q. The anther contains :
(a) sepals
(b) ovules
(c) carpel
(d) pollen grains

Q. Question 28
In a bisexual flower, the young stamens are removed artificially but the flower produces fruit. Provide a suitable explanation for the above situation.

Q.

What are the fate of different floral parts after fertilization?

Q.

Question 18
Which among the following statements are true about sexual reproduction in the flowering plants?

(i) It requires two types of gametes
(ii) Fertilisation is a compulsory event
(iii) It always results in the formation of a zygote
(iv) Offspring formed are clones

(a) (i) and (iv)
(b) (i), (ii) and (iv)
(c) (i), (ii) and (iii)
(d) (i), (ii) and (iv)

Q.

Differentiate between complete flower and incomplete flower.

Q.

What are the three parts of gynoecium?

Q.

Mature ovary forms the _________

Q.

What is the nature of the mesocarp in coconut?

Q.

Fill in the following blanks with suitable words :
(a) Pollen grains contain ___ gametes of a plant.
(b) Ovules contain ___ gametes of a plant.
(c) The ovary of a flower becomes ___ after fertilisation.
(d) The ovule becomes a ___ after fertilisation.
(e) Flowering plants reproduce by ___ method of reproduction.
(f) The female organ of reproduction in the flower is the ___
(g) The male organ of reproduction in the flower is the ___
(h) The name of the structure in the flower in which the male gamete is formed is ___
(i) The ___ at the base of the carpel contains egg cells.
(j) The term used to refer to the transfer of pollen from the stamen of one flower to the carpel of another flower of the same species is ___
(k) The cells involved in sexual reproduction are called ___
(l) Fusion of gametes gives rise to a single cell called ___
(m) The process of fusion of gametes is called ___
(n) A multicellular animal starts its life from a ___ through sexual reproduction.
(o) The union of a sperm nucleus with an egg nucleus is known as ___ and results in a ___
(p) The menstrual cycle is controlled by ___

Q. The ovary after fertilisation is converted into:

1. Fruit
2. Embryo
3. Endosperm
4. Seed
   

Q.

The group of sepals are called_________.

1. gynoecium

2. calyx

3. corolla

4. androecium

Q.

The part of an embryo which gives rise to root is called …………………… and the part which gives rise to shoot is called ………………………..

1. radicle, plumule

2. endosperm; plumule

3. radicle ; cotyledons

4. plumule ; radicle