NCERT Solutions for Class 7 Science Chapter 12 Reproduction in Plants

Reproduction in Plants Class 7 Solutions:

Q1. 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 _____________.

Answer:

(a) Production of new individuals from the vegetative part of parent is called vegetative propagation .

(b) A flower may have either male or female reproductive parts. Such a flower is called unisexual flower .

(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 fertilization .

(e) Seed dispersal takes place by means of wind , water, and animal .

Reproduction in Plants Class 7 NCERT Solutions:

Q2. Describe the different methods of asexual reproduction. Give examples.

Answer:

Different methods of asexual reproduction are:

(i) Fission : is division, the parent cell divides into two or more cells. Fission can be of two types, namely, binary fission and multiple fission. In binary fission, the parent cell divides into two equal halves called daughter cells. During the multiple fission, the organism divides itself into numerous daughter cells.

(ii) Fragmentation : The parent body divides into two or more fragments. Later, each fragment develops into a new individual.

(iii) Regeneration : In these organisms, when the cell divides into numerous pieces, each piece proliferates and differentiates to regenerate new organisms. For example, when a lizard loses its tail, it grows a new one.

(iv) Budding : Some organisms develop buds on their body and these buds develop into a new individual, this is known as budding.

(v) Vegetative propagation : Reproduction through their vegetative parts such as leaves, roots, buds, and stems and this is known as vegetative propagation.

Class 7 Science Chapter 12 Question Answer:

Q3. Explain what you understand by sexual reproduction.

Answer:

When two parents are involved in reproduction, the method is called sexual reproduction.

During fertilization, the male and female gametes fuse to produce a zygote.

Then zygote subsequently develops into an embryo which further develops into a new individual.

Class 7 Science Chapter 12 NCERT Solutions:

Q4. State the main difference between asexual and sexual reproduction.

Answer:

The main differences between asexual and sexual reproduction are:

Class 7 Reproduction in Plants NCERT Solutions:

Q5. Sketch the reproductive parts of a flower.

Answer:

The sketch of the reproductive parts fo flower is shown below:

Reproduction in Plants Class 7 Questions and Answers:

Q6. Explain the difference between self-pollination and cross-pollination.

Answer:

The differences between the self-pollination and the cross-pollination are:

Class 7 Science Ch 12 Question Answer:

Q7. How does the process of fertilisation take place in flowers?

Answer:

Once the pollen grains spread on the stigma, it produces a pollen tube and this process is called the germination of pollen grains.

Then the pollen tube penetrates the style and reaches the ovary where the male nucleus is transferred through this pollen tube and finally, the fusion of male and female nuclei takes place inside the ovary. Thus, this step is called fertilization.

Chapter 12 Science Class 7th NCERT Solutions:

Q8. Describe the various ways by which seeds are dispersed.

Answer:

Seeds and fruits of plants are carried away by the wind, water, and animals.

By wind: Winged seeds such as those of drumstick and maple, light seeds of grasses or hairy seeds of aak (Madar) and hairy fruit of the sunflower, get blown off with the wind to far away places.

By water: Some seeds are dispersed by water. These fruits or seeds usually develop floating ability in the form of the spongy or fibrous outer coat as in coconut.

By animals: Some seeds are dispersed by animals, especially spiny seeds with hooks that get attached to the bodies of animals and are carried to distant places. Examples are Xanthium and Urena.

By bursting: Some seeds are dispersed when the fruits burst with sudden jerks. The seeds are scattered far from the parent plant. This happens in the case of castor and balsam.

Class 7 Chapter 12 Science NCERT Solutions:

Q9. 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

Answer:

The matched columns are shown below:

NCERT Solutions for Class 7 Science Ch 12:

Q10. Tick the correct answer: (a) The reproductive part of a plant is the

(i) leaf (ii) stem (iii) root (iv) flower

Answer:

(a) The reproductive part of a plant is the

(iv) Flower.

NCERT Solutions for Class 7 Science Chapter 12:

Q11. Tick the correct answer: (b) The process of fusion of the male and the female gametes is called

(i) fertilisation (ii) pollination (iii) reproduction (iv) seed formation

Answer:

(b) The process of fusion of the male and the female gametes is called (i) Fertilization.

Q12. Tick the correct answer:

(c) Mature ovary forms the

(i) seed (ii) stamen (iii) pistil (iv) fruit

Answer:

(c) Mature ovary forms the (iv) Fruit.

Q13. Tick the correct answer:

(d) A spore-producing organism is

(i) rose (ii) bread mould (iii) potato (iv) ginger

Answer:

(d) A spore producing organism is (ii) bread mould.

Q14. Tick the correct answer:

(e) Bryophyllum can reproduce by its

(i) stem (ii) leaves (iii) roots (iv) flower

Answer:

(e) Bryophyllum can reproduce by its (ii) leaves.