Class 7 Science · 20 questions · 17 with answers
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.
(b) (i), (ii) and (iii)
Lila observed that a pond with clear water was covered up with a green algae within a week. By which method of reproduction did the algae spread so rapidly?
(c) Fragmentation
Seeds of drumstick and maple are carried to long distances by wind because they possess
(a) winged seeds
The ‘eye’ of the potato plant is what
(c) the bud is to Bryophyllum leaf.
The ovaries of different flowers may contain
(c) one to many ovules
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)
Pollination refers to the
(c) transfer of pollen from anther to stigma.
Fungus, moss and fern reproduce by a common method of asexual reproduction. Name the method.
They can reproduce asexually by means of 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, as it does not reproduce by vegetative propagation whereas the other three plants do.
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 type of pollination does the Figure 12.1 indicate? Fig. 12.1
This question refers to a figure in the original PDF.
It shows self pollination.
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 from the tree may have fallen below and germinated into small plants. SHORT ANSWER QUESTIONS
In the diagram given in Figure 12.2 label the parts marked
This question refers to a figure in the original PDF.
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? REPRODUCTION IN PLANTS 65
Group the seeds given in Figure12.3 (i) to (iii) according to their means of dispersion.
This question refers to a figure in the original PDF.
(a) Seed dispersed by wind
(b) Seed dispersed by water
(c) Seed dispersed by animal (i) (ii) (iii) Fig. 12.3
Coconut is a large and heavy fruit. How is it adapted for dispersal by water?
Coconut fruit has spongy fibers, which helps it to float in water. ANSWERS 125 LONG ANSWER QUESTIONS
In the figure of a flower given in Figure 12.4, label the parts whose functions are given below and give their names.
This question refers to a figure in the original PDF.
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 as Figure 12.5, draw the missing part and label the parts marked
This question refers to a figure in the original PDF.
Write how the following seeds are dispersed.
(a) Seeds with wings.
(b) Small and light seeds.
(c) Seeds with spines/hooks.