NCERT Solutions for Class 7 Science Chapter 12 Reproduction In Plants

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Updated at 2021-02-11


NCERT solutions for class 7 Science Chapter 12 Reproduction In Plants Exercise

Q.1 Fill in the blanks:
(a) Production of new individuals from the vegetative part of parent is called ___________.
(b) A flower may have either male or female reproductive parts. Such a flower is called _______.
(c) The transfer of pollen grains from the anther to the stigma of the same or of another flower of the same kind is known as __________.
(d) The fusion of male and female gametes is termed as ____________.
(e) Seed dispersal takes place by means of ________ and __________.



NCERT Solutions for Class 7 Science Chapter 12 Reproduction In Plants


Answer :

(a) Production of new individuals from the vegetative part of parent is called __vegitative reproduction__.
(b) A flower may have either male or female reproductive parts. Such a flower is called __unisexual__.
(c) The transfer of pollen grains from the anther to the stigma of the same or of another flower of the same kind is known as __pollination__.
(d) The fusion of male and female gametes is termed as __fertilisation__.
(e) Seed dispersal takes place by means of __wind_ and __animals__.

Q.2 Describe the different methods of asexual reproduction. Give examples.



NCERT Solutions for Class 7 Science Chapter 12 Reproduction In Plants


Answer :

The various modes of asexual reproduction in plants are as follows:
(i)Vegetative propagation: It is the ability of a plant to produce new plants from roots, stems, leaves, and buds. Vegetative propagation is divided into two types.
(a) Natural vegetative propagation: This type of vegetative propagation occurs easily in nature and involves simple vegetative parts. Potato plant sprouting from an eye is a common example.
(b) Artificial vegetative propagation: This type of vegetative propagation is performed manually and generally occurs in laboratory conditions. The formation of a complete plant from a stem cutting of rose is a common example of this method.
(ii) Budding:It involves the formation of a new individual from a bulb-like projection called a bud. The bud grows and gets detached from the parent to form a new individual. It is commonly observed in yeast.
(iii) Fragmentation:It is a form of asexual reproduction where a new organism is formed from the fragments of the parent body. It is the only mode of asexual reproduction in Spirogyra.
(iv)Spore formation:Many non-flowering plants reproduce through spore formation. Spores are tiny cells protected by a thick wall. Fungi such as bread moulds reproduce asexually using this method.

Q.3 Explain what you understand by sexual reproduction.



NCERT Solutions for Class 7 Science Chapter 12 Reproduction In Plants


Answer :

Sexual reproduction is a process which involves production of seeds. It requires two parents. Most plants reproduce sexually with the help of flowers. The main function of a flower is to reproduce and therefore develop new seeds that can grow into new plants.

Q.4 State the main difference between asexual and sexual reproduction.



NCERT Solutions for Class 7 Science Chapter 12 Reproduction In Plants


Answer :

Asexual reproduction

(i) It requires only one parents
(ii) occurs in lower plants
(iii) In asexual reproduction new plants are obtained without production of seeds.
(iv) Examples are yeast, rose jasmine etc.

sexual reproduction

(I) it requires two parents
(ii) occurs in higher plants
(iii) in sexual reproduction, new plants are obtained from seeds.
(iv) examples are the following palm, hibiscus, potato, corn, papaya etc.

Q.5 Sketch the reproductive parts of a flower.



NCERT Solutions for Class 7 Science Chapter 12 Reproduction In Plants


Answer :

Q.6 Explain the difference between self-pollination and cross-pollination.



NCERT Solutions for Class 7 Science Chapter 12 Reproduction In Plants


Answer :

Self-pollination
If the pollen lands on the stigma of the same flower or another flower of the same plant, it is. called self-pollination.
cross-pollination
When the pollen of a flower lands on the stigma of a flower of a different plant of the same kind, it is called cross-pollination.

Q.7 How does the process of fertilization take place in flowers?



NCERT Solutions for Class 7 Science Chapter 12 Reproduction In Plants


Answer :

When pollen lands on stigma, it germinates and gives rise to a pollen tube that passes through the style and reaches the ovary of a pistil. When the pollen tube reaches an ovule, it releases the male gametes. A male gamete fuses with a female gamete in the ovule. This process is known as fertilisation. The cell which is formed after the fusion of a male and a female gamete is known as zygote. This zygote divides several times in order to form the embryo present inside the seed.

Q.8 Describe the various ways by which seeds are dispersed.



NCERT Solutions for Class 7 Science Chapter 12 Reproduction In Plants


Answer :

Seed dispersal occurs by the following agencies.
(a)Dispersal by animals - There are many ways by which birds and animals can disperse seeds. For example, birds and animals can eat the fruits and excrete the seeds away from the parent plant. Some seeds have barbs or other structures that get attached to the animal's body and are carried to new sites. Some fruits have hooks on them which cling to fur or clothes.
(b)Dispersal by the wind - Seeds that get dispersed by wind are usually smaller in size or they have wings or hair-like structures. For example, winged seeds of drumsticks, hairy fruit of the sunflower, etc. are dispersed by wind.
(c)Dispersal by water - Many aquatic plants or plants that live near water has seeds that can float and are carried away by water. For example, coconuts can float and are dispersed by water.
(d) Dispersal by an explosion - Sometimes the seeds are dispersed by the bursting of fruits with sudden jerks. The seeds get scattered or distributed far from the parent plant. Examples of such plants are castor and balsam.

Q.9 .Match items in Column I with those in Column II
Column I. Column II
(a) Bud (i) Maple
(b) Eyes. (ii) Spirogyra
(c) Fragmentation (iii) Yeast
(d) Wings (iv) Bread mould
(e) Spores. (v) Potato
(vi) Rose



NCERT Solutions for Class 7 Science Chapter 12 Reproduction In Plants


Answer :

Column I Column II
(a) Bud ?. (iii) Yeast
(b) Eyes. ?(v) Potato
(c) Fragmentation? (ii) Spirogyra
(d) Wings ?(i) Maple
(e) Spores\rughtarrow (iv) Bread mould

Q.10 Tick the correct answer:
(a) The reproductive part of a plant is the
(i) leaf (ii) stem (iii) root (iv) flower
(b) The process of fusion of the male and the female gametes is called
(i) fertilisation (ii) pollination (iii) reproduction (iv) seed formation
c) Mature ovary forms the
(i) seed (ii) stamen (iii) pistil (iv) fruit
(d) A spore producing plant is
(i) rose (ii) bread mould (iii) potato (iv) ginger
(e) Bryophyllum can be reproduced by it's
(i) stem (ii) leaves (iii) roots (iv) flower



NCERT Solutions for Class 7 Science Chapter 12 Reproduction In Plants


Answer :

(a) (iv) flower (b) (i) fertilisation (c) (iv) fruit (d) (ii) bread mould (e) (ii) leaves



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