NCERT Solutions for Class 7 Science Chapter 12 Reproduction In Plants are provided here with simple step-by-step explanations. These solutions for Reproduction In Plants are extremely popular among Class 7 students for Science Reproduction In Plants Solutions come handy for quickly completing your homework and preparing for exams. All questions and answers from the NCERT Book of Class 7 Science Chapter 12 are provided here for you for free. You will also love the ad-free experience on Meritnation’s NCERT Solutions. All NCERT Solutions for class Class 7 Science are prepared by experts and are 100% accurate.
Page No 62:
Question 1:
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)
Answer:
The process of sexual reproduction takes place in flowers. As a result of fertilization, the ovary develops into fruit and ovules develop into seed.
Hence, the correct answer is option (b).
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Question 2:
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?
(a) Budding
(b) Sexual reproduction
(c) Fragmentation
(d) Pollination
Answer:
An alga breaks up into two or more fragments and these fragments or pieces grow into new individuals. This process is known as fragmentation. When this process continues, algae cover a large area in a short period of time.
Hence, the correct answer is option (c).
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Question 3:
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
Answer:
Seeds of drumsticks and maple have winged seeds due to which they are carried to long distances by wind.
Hence, the correct answer is option (a).
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Question 4:
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.
Answer:
The eye of the potato acts as a vegetative organ for reproduction similarly, the bud of the Bryophyllum leaf helps in its vegetative propagation.
Hence, the correct answer is option (c).
Page No 63:
Question 5:
The ovaries of different flowers may contain
(a) only one ovule
(b) many ovules
(c) one to many ovules
(d) only two ovules
Answer:
The ovaries of different flowers contain one to many ovules.
Hence, the correct answer is option (c).
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Question 6:
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)
Answer:
In the process of sexual reproduction, fertilization can only occur after pollination because pollination allows the contact of male and female gamete. The result of fertilization is the seed that grows into a new plant.
Hence, the correct answer is option (a).
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Question 7:
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.
Answer:
Pollination refers to the transfer of pollen from anther to the stigma of the same flower or of another flower. Pollination is achieved with the help of pollinating agents such as air, water, or insects.
Hence, the correct answer is option (c).
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Question 8:
Fungus, moss and fern reproduce by a common method of asexual reproduction. Name the method.
Answer:
Fungus, moss and fern reproduce through spore formation. Spores are asexual reproductive bodies. Each spore is covered by a hard protective coat to withstand unfavorable conditions. Under favourable conditions, a spore germinates and develops into a new individual.
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Question 9:
Pick the odd one out from the following on the basis of mode of reproduction and give reason for it.
Sugarcane, Potato, Rice, Rose
Answer:
Among the given options, Rice is the odd one because it is the only plant that does not reproduce vegetatively. Sugarcane, potato and rose can reproduce through vegetative propagation.
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Question 10:
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?
Answer:
The asexual reproduction in rose plants occurs through stem cuttings while sexual reproduction occurs through pollen grains. So, to grow a new rose plant both pollen grains and branch can be used.
Page No 64:
Question 11:
Which type of pollination does the given figure indicate?
Answer:
This figure indicates self-pollination, where pollen is transferred from the anther to the stigma of the same flower.
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Question 12:
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.
Answer:
The growth of such plants occurs due to seed dispersal. It is a natural process where seeds and fruits of plants are carried away by wind, water and animals.
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Question 13:
In the diagram given label the parts marked (a), (b) and (c).
​
Answer:
(a) Pollen grain
(b) Pollen tube
(c) Zygote
Page No 64:
Question 14:
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?
Answer:
(a) This growth is known as mould which is a fungus.
(b) The growth of mould occurs due to spore formation, which is a type of asexual reproduction.
Page No 65:
Question 15:
Group the seeds given in Figure (i) to (iii) according to their means of dispersion.
(a) Seed dispersed by wind
(b) Seed dispersed by water
(c) Seed dispersed by animal
|
|
|
| (i) | (ii) | (iii) |
Answer:
(i) is the seed of drumstick and (ii) is the seed of aak (madar), both are dispersed through wind.
(iii) is the seed of Xanthium and it is dispersed by animals.
Page No 65:
Question 16:
Coconut is a large and heavy fruit. How is it adapted for dispersal by water?
Answer:
The fruit of coconut has a spongy or fibrous outer coat that makes it suitable to get dispersed through water.
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Question 17:
In the figure of a flower given in Figure , 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.
Answer:
IMAGE
Page No 66:
Question 18:
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)______ .
Answer:
(a) zygote
(b) fertilisation
(c) embryo
(d) seeds
(e) fruit
Page No 66:
Question 19:
In the diagram of a bisexual flower given as Figure , draw the missing part and label the parts marked (a), (b) and (c). Also label the missing part that you draw.
Answer:
(a) Petals
(b) Sepals
(c) Stamen
IMAGE
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Question 20:
Write how the following seeds are dispersed.
(a) Seeds with wings.
(b) Small and light seeds.
(c) Seeds with spines/hooks.
Answer:
(a) Through wind
(b) Through wind
(c) Through animals
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