NCERT Exemplar solutions for Science [English] Class 7 chapter 12 - Reproduction in Plants [Latest edition]

Which of the following parts of a plant take part in sexual reproduction?

(i) Flower

(ii) Seed

(iii) Fruit

(iv) Branch

Choose the correct answer from below.

Lila observed that a pond with clear water was covered up with a green alga within a week. By which method of reproduction did the algae spread so rapidly?

Seeds of drumstick and maple are carried long distances by wind because they possess

The ‘eye’ of the potato plant is what

The ovaries of different flowers may contain

Which of the following statements is/are true for sexual reproduction in plants?

(i) Plants are obtained from seeds.

(ii) Two plants are always essential.

(iii) Fertilisation can occur only after pollination.

(iv) Only insects are agents of pollination.

Choose from the options given below.

Pollination refers to the

Fungus, moss and fern reproduce by a common method of asexual reproduction. Name the method.

Pick the odd one out from the following on the basis of the mode of reproduction and give a reason for it.

Sugarcane, Potato, Rice, Rose

Boojho had the following parts of a rose plant – a leaf, roots, a branch, a flower, a bud and pollen grains. Which of them can be used to grow a new rose plant?

Which type of pollination does Figure 12.1 indicate?

One morning as Paheli strolled in her garden she noticed many small plants which were not there a week ago. She wondered where they had come from as nobody had planted them there. Explain the reason for the growth of these plants.

In the diagram given in Figure 12.2 label the parts marked (a), (b) and (c).

When you keep food items like bread and fruits outside for a long time, especially during the rainy season, you will observe a cottony growth on them.

What is this growth called?

When you keep food items like bread and fruits outside for a long time, especially during the rainy season, you will observe a cottony growth on them.

How does the growth take place?

Group the seeds given in Figure12.3 (i) to (iii) according to their means of dispersion.

(a) Seed dispersed by wind

(b) Seed dispersed by water

(c) Seed dispersed by animal

Coconut is a large and heavy fruit. How is it adapted for dispersal by water?

In the figure of a flower given in Figure 12.4, label the parts whose functions are given below and give their names.

(a) The part which contains pollen grains.

(b) The part where the female gamete is formed.

(c) The female reproductive part where pollen grains germinate.

(d) The colourful part of the flower attracts insects.

The male and female gametes fuse to form a _____(a)______ during the process of _____(b)______. This grows into an _____(c)______ which is enclosed within a seed. After fertilisation the ovules develop into _____(d)______ and the ovary develops into a _____(e)______.

In the diagram of a bisexual flower given in Figure 12.5, draw the missing part and label the parts marked (a), (b) and (c). Also, label the missing part that you draw

Write how the following seed is dispersed.

Seeds with wings.

Write how the following seed is dispersed.

Small and light seeds.

Write how the following seed is dispersed.

Seeds with spines/hooks.