Lesson: Reproduction in Plants

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.

(a)            (i) and (ii)

(b)            (i), (ii) and (iii)

(c)            (iii) and (iv)

(d)            (ii), (iii) and (iv)

b

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

(a)            Budding

(b)            Sexual reproduction

(c)            Fragmentation

(d)            Pollination

c

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

(a)            winged seeds

(b)            large and hairy seeds

(c)            long and ridged fruits

(d)            spiny seeds

a

The ‘eye’ of the potato plant is what

(a)            The root is to any plant.

(b)            The bud is to a flower.

(c)            The bud is to Bryophyllum leaf.

(d)            The anther is to stamen.

c

The ovaries of different flowers may contain

(a)            only one ovule

(b)            many ovules

(c)            one to many ovules

(d)            only two ovules

c

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.

(a)            (i) and (iii)

(b)            (i) only

(c)            (ii) and (iii)

(d)            (i) and (iv)

a

Pollination refers to the

(a)            transfer of pollen from anther to ovary.

(b)            transfer of male gametes from anther to stigma.

(c)            transfer of pollen from anther to stigma.

(d)            transfer of pollen from anther to ovule.

c

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

They show asexual reproduction through spore formation.

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

Sugarcane, Potato, Rice, Rose

Rice, this is because rice does not show asexual reproduction through vegetative propagation, unlike the other three plants named here.

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?

Branch, which is a stem cutting, can be used for growing a new rose plant through asexual reproduction (vegetative propagation).

Which type of pollination does the figure given below indicate?

It shows self-pollination in which pollen from the anther gets transferred to the pistil of the same flower.

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.

The seeds may have been carried by birds, or they may have fallen from the trees growing in the garden, and germinated into new plants.

 

In the diagram given, 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.

(a)            What is this growth called?

(b)            How does the growth take place?

(a)            The white cottony growth is that of a fungus, known as the bread mould.

(b)            The bread mould grows from spores. 

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

(a)            Seed dispersed by wind

(b)            Seed dispersed by water

(c)            Seed dispersed by animal

Seeds dispersed by wind: (i) Maple and (ii) Madar (aak)

Seed dispersed by animal: (iii) Xanthium

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

Coconut fruit has fibrous outer coat that helps it to float in water and move long distances.

In the figure of a flower given, 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 flower which attracts insects.

Fill in the blanks with correct terms.

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)______ .

(a)            zygote

(b)            fertilization

(c)            embryo

(d)            seed

(e)            fruit

In the diagram of a bisexual flower given, 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 seeds are dispersed.

(a)            Seeds with wings.

(b)            Small and light seeds.

(c)            Seeds with spines/hooks.

(a)            Seeds with wings, such as maple and drumstick, are light and easily blown away by air, and they are dispersed by the wind to faraway places.

(b)            Light seeds of grasses are also easily carried to faraway places by the air, hence dispersed by the wind.

(c)            Seeds with spines and hooks get attached to the hair and clothes of animals/humans and carried off to distant places; hence their dispersal is by the animals.