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Ncert Exemplar Solutions Class 7 Science Reproduction in Plants
Welcome to NCTB Solutions. Here with this post we are going to help 7th class students for the Solutions of NCERT Exemplar Class 7 Science Book, Unit 12, Reproduction in Plants. Here students can easily find step by step solutions of all the problems for Reproduction in Plants, Also here our Science teacher’s are solved all the questions with easily understandable language with proper guidance so that all the students can understand easily.
Reproduction in Plants all Question Solutions :
Multiple Choice Questions :
Question no – (1)
Which of the following parts of a plant take part in sexual reproduction?
The correct answer is option – (b) (i), (ii) and (iii)
Flowers, seeds and fruits take part in the sexual reproduction of plants.
Question no – (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?
The appropriate answer is option – (c)
Algae spread so quickly through a reproductive method called fragmentation.
Question no – (3)
Seeds of drumstick and maple are carried to long distances by wind because they possess
The correct option is – (a)
Seeds of drumstick and maple are carried to long distances by wind because they possess winged seeds.
Question no – (4)
The ‘eye’ of the potato plant is what
The answer is alternative – (c)
The ‘eye’ of the potato plant is what the bud is to Bryophyllum leaf.
Question no – (5)
The ovaries of different flowers may contain
The correct answer is option – (c)
The ovaries of different flowers may contain one to many ovules.
Question no – (6)
Which of the following statements is/are true for sexual reproduction in plants?
The answer is alternative – (a) (i) and (iii)
The correct statement are –
(i) Plants are obtained from seeds.
(iii) Fertilisation can occur only after pollination.
Question no – (7)
Pollination refers to the
The appropriate answer is option – (c)
Pollination refers to the transfer of pollen from anther to stigma.
Very Short Answer Questions :
Question no – (8)
Fungus, moss and fern all reproduce by a common method of asexual reproduction that is often called as spores formation. The spores gets released by the plants into the atmosphere. The spores are light so it can be carried by wind to nearby places where it lands and germinates into a new plant. The spores have a hard coat to protect itself from heat and low humidity.
Question no – (9)
Rice is the odd one because all other reproduce by means of vegetative propagation while rice reproduce by means of pollination.
Question no – (10)
The branch of the rose plant can be used to produce a new plant by means of vegetative propagation that is a stem is cut from the rose plant .The stems lower portion is buried in the ground and is watered regularly for some days. Few days later it begins to grow roots and germinates into a new plant.
Question no – (11)
The figures show self – Pollination because the pollen of the same flower or of the same plant fall on the stigma of the flower.
Question no – (12)
The plants in her garden might have grown due to seed dispersal. It means that the seeds of some plant might have been carried to her garden by some means like air , water and animals. These seeds upon germination became those small plants.
Short Answer Questions :
Question no – (14)
(a) These growth on food items like bread and fruits are known as fungus which occurs when they are kept outside for a long time especially during the rainy season.
(b) This growth takes place when spores of fungus flies and settles on the surface of the bread where it germinates and grow to produce more of its kind.
Question no – (15)
(a) Seeds dispersed by air : The seeds in fig ‘I‘ that is maple seeds is dispersed by air since it is very light.
(b) seeds dispersed by water : The seeds in figure ‘II‘ that is mandar seeds is dispersed by water as it floats in water
(c) Seeds dispersed by animals : The seeds in figure ‘III‘ that is Xanthium is dispersed by animals as these have hooks to attach to animals.
Question no – (16)
Although the coconut is a large and heavy fruit it outer covering is very fibrous which makes the coconut to float in water and thus it can be dispersed by means of water.
Long Answer Questions :
Question no – (17)
(a) The part which contains pollen grains called Anther.
(b) The part where the female gamete is formed is called Stigma.
(c) The female reproductive part where pollen grains germinate is called Ovary.
(d) The colourful part of flower which attracts insects is called petals.
Question no – (18)
The male and female gametes fuse to form a zygote during the process of fertilization. This grows into an embryo which is enclosed within a seed. After fertilisation the ovules develop into seed and the ovary develops into a fruit.
Question no – (19)
Question no – (20)
(a) seeds with wings – they are dispersed by winds
(b) small and light seeds – they are dispersed by water
(c) seeds with spines/ hooks – they are dispersed by animals.
Other Chapter Solutions :
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