NCERT Solutions for Class 7 Science Chapter 12 Reproduction in Plants are part of NCERT Solutions for Class 7 Science. Here we have given NCERT Solutions for Class 7 Science Chapter 12 Reproduction in Plants.
|Chapter Name||Reproduction in Plants|
|Number of Questions Solved||10|
NCERT Solutions for Class 7 Science Chapter 12 Reproduction in Plants
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 ……….. .
(a) vegetative propagation
(b) unisexual flower
(e) wind, water, animals.
Describe the different methods of asexual reproduction. Give examples.
Various methods of asexual reproduction are:
(i) Vegetative propagation : When new plants are obtained from leaves, stems and roots, it is called as vegetative propagation, e.g., in rose, sugarcane, potato, ginger (stem), Bryophyllum (leaf), sweet potato, Dahlia (roots) and any detached body part of cacti.
(ii) Budding : Reproduction in yeast is by budding. The small bulb like projection called bud comes out from the parent cell. The bud gradually grows and gets detached from the parent cell and forms a new yeast cell.
(iii) Fragmentation : Some organisms like Spirogyra break up into two or more fragments and each fragment develops into a new plant.
(iv) Spore formation : The spores are the asexual reproductive parts which are covered by a protective covering to withstand unfavourable conditions. Under favourable conditions, the spore germinates and develops into a new individual.
Fig. Vegetative propagation in (a) bryophyllum (by leaf) (b) potato (by stem)
Explain what do you understand by sexual reproduction?
In sexual reproduction*, the male and the female gametes fuse to form a zygote. For sexual reproduction one or two parents are required to produce two different gametes and ultimately after zygote formation, new individual forms.
State the main difference between sexual and asexual reproduction.
|Sexual Reproduction||Asexual Reproduction|
|1. New plants are obtained from seeds.||1. Plants can give rise to new plants without seeds.|
|2. Two parents are required to produce an individual.||2. The new individual comes from a single parent.|
|3. Takes place with the help of specialized sex cells.||3. No sex cells are required.|
|4. New individual has the characters of both the parents.||4. Characters of the new individual are same as that of the parent.|
Sketch the reproductive parts of a flower.
Fig. Reproductive parts of a flower
Explain the difference between self-pollination and cross-pollination.
|Self – Pollination||Cross – Pollination|
|1.In self-pollination, pollen grains of a flower reach to the stigma of same flower.||1.In cross-pollination, there is transfer of pollen grains from the anthers of a flower to the stigma of another flower on a different plant of the same species.|
|2. No pollinating agent is required.||2. Pollinating agents like wind, air or insects are required.|
|3. Occurs only in bisexual flowers.||3. Occurs in unisexual flower, under mono- ecious/diecious condition.|
|4. It does not lead to genetic variation in the progeny.||4. It leads to genetic variation in the progeny.|
How does the process of fertilisation take place in flowers?
Pollen grain reaches on the stigma of a carpel by pollination. On the stigma, the pollen grain germinates and a pollen tube comes out. This pollen tube grows and approaches through the style to ovary, carrying male gametes with it, where it enters the ovule. Inside the ovule, there is female gamete or egg. The male gamete fuses with the female gamete. This process is called fertilisation.
Describe the various ways by which the seeds are dispersed.
Seeds are dispersed to different places in the following ways :
(i) By wind : Seeds dispersed by wind are either winged (e.g., drumstick and maple) or light (e.g., grasses) or hairy (e.g., aak and sunflower).
(ii) By water : Seeds dispersed by water develop floating ability (e.g., coconut).
(iii) By insects and other animals : Seeds which are spiny (e.g., Xanthium and urena) have hooks and get attached to the body of animals or to clothes of passers-by. They are self carried to different places.
(iv) Some seeds are dispersed when the fruit bursts with sudden jerks (e.g., castor and balsam).
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|
|Column I||Column II|
|(a) Bud||(iii) Yeast|
|(b) Eyes||(v) Potato|
|(c) Fragmentation||(ii) Spirogyra|
|(d) Wings||(i) Maple|
|(e) Spores||(iv) Bread mould|
Tick (√) the correct answer :
(а) The reproductive part of a plant is the
(b) The process of fusion of the male and the female gametes is called
(iv) seed formation
(c) Mature ovary forms the
(d) A spore producing plant is
(ii) bread mould
(e) Bryophyllum can reproduce by its
(a) (iv) flower
(b) (i) fertilisation
(c) (iv) fruit
(d) (ii) bread mould
(e) (ii) leaves
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