1.
Fill in the blanks:
(a) Production of new individual from the vegetative parts of parent is called vegetative propagation .
(b) A flower may have either male or female reproductive parts. Such flower is called unisexual flowers .
(c) The transfer of pollen grains from the anther to 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, insect and water
2. Describe the different methods of asexual reproduction. Give examples.
Ans.Various methods of asexual reproduction are: a. Vegetative propagation- In this method new plants a re developed from root, stem or leaf of plant.
b. Budding – Here, small bulb-like projection coming out from, yeast cell is called bud, gradually grows and gets detached from parent body to form new organism. Ex- hydra, yeast.
c. Fragmentation- In favorable condition, plant body breaks into two or more fragments which grow into independent plant.
d. Spore formation – The fungi on bread pieces grow from spores which are present in air. Spores germinate when come in contact of moisture.
3. Explain what you understand by sexual reproduction.
Ans.The mode of reproduction in which male and female gamete fuse together to form a zygote. Zygote divides further to form new organism . Male and female gamete may be of same kind or different kind. Sexual reproduct ion is common in multicellular organism and unicellular organism in unfavorable co ndition.
4. State the main difference between asexual and sexual reproduction.
Ans.
5. Sketch the reproductive parts of flower.
Ans.
6. Explain the difference between self-pollination and cross-pollination.
Ans.If the pollen lands on the stigma of the same f lower it is called self-pollination. When the pollen of a flower lands on the stigma of anoth er flower of the same plantor that of different plant of same speices. It is called cross-pollination.
7. How does the process of fertilisation take place in flowers?
Ans.The male and female gametes fuse together to for m zygote. The process of fusion of male and female gamete is called fertilization. The zygote undergo to mitotic division to form embryo.
8. Describe the various ways by which seeds are disper sed.
Ans.Dispersal of seed takes place by various means s uch as wind, water, insects, animals and birds. The seeds dispersed by wind are light an d smaller in size. So, that it may be carried by wind easily. The water dispersed seed s are generally floating in nature. Spiny seeds with hooks are generally carried by ani mal’s body. The birds disperse the seed to faraway places by eating fruit, they ex crete with digesting the seeds.
.
9.(a) Production of new individual from the vegetative parts of parent is called vegetative propagation .
(b) A flower may have either male or female reproductive parts. Such flower is called unisexual flowers .
(c) The transfer of pollen grains from the anther to 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, insect and water
2. Describe the different methods of asexual reproduction. Give examples.
Ans.Various methods of asexual reproduction are: a. Vegetative propagation- In this method new plants a re developed from root, stem or leaf of plant.
b. Budding – Here, small bulb-like projection coming out from, yeast cell is called bud, gradually grows and gets detached from parent body to form new organism. Ex- hydra, yeast.
c. Fragmentation- In favorable condition, plant body breaks into two or more fragments which grow into independent plant.
d. Spore formation – The fungi on bread pieces grow from spores which are present in air. Spores germinate when come in contact of moisture.
3. Explain what you understand by sexual reproduction.
Ans.The mode of reproduction in which male and female gamete fuse together to form a zygote. Zygote divides further to form new organism . Male and female gamete may be of same kind or different kind. Sexual reproduct ion is common in multicellular organism and unicellular organism in unfavorable co ndition.
4. State the main difference between asexual and sexual reproduction.
Ans.
5. Sketch the reproductive parts of flower.
Ans.
6. Explain the difference between self-pollination and cross-pollination.
Ans.If the pollen lands on the stigma of the same f lower it is called self-pollination. When the pollen of a flower lands on the stigma of anoth er flower of the same plantor that of different plant of same speices. It is called cross-pollination.
7. How does the process of fertilisation take place in flowers?
Ans.The male and female gametes fuse together to for m zygote. The process of fusion of male and female gamete is called fertilization. The zygote undergo to mitotic division to form embryo.
8. Describe the various ways by which seeds are disper sed.
Ans.Dispersal of seed takes place by various means s uch as wind, water, insects, animals and birds. The seeds dispersed by wind are light an d smaller in size. So, that it may be carried by wind easily. The water dispersed seed s are generally floating in nature. Spiny seeds with hooks are generally carried by ani mal’s body. The birds disperse the seed to faraway places by eating fruit, they ex crete with digesting the seeds.
.
Ans.(a) (iii) (b) (v) (c) (ii) (d) (i) (e) (iv)
10.Tick ( ) the correct answer:
(a) The reproductive part of a plant is the
(i) Leaf
(ii) Stem
(iii) Root
(iv) Flower
Ans.Flower
(b) The process of fusion of the male and female gamete s is called
(i) Fertilisation
(ii) Pollination
(iii) Reproduction
(iv) Seed formation
Ans.Fertilisation
(c) Mature ovary forms the
(i) Seed
(ii) Stamen
(iii) Pistil
(iv) Fruit
Ans.Fruit
(d) A spore producing plant is
(i) Rose
(ii) Bread mould
(iii) Potato
(iv) Ginger
(e) Bryophyllum can reproduce by its
Ans.Bread Mould
(i) Stem
(ii) Leaves
(iii) Roots
(iv) Flower
Ans.Leaves
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