Are you looking for DAV Books Solutions then you are in right place, we have discussed the solution of Science class 7 book Chapter 9 Reproduction in Plants followed in all DAV School Solutions are given below with proper Explanation please bookmark our website for further updates!! All the Best !!
DAV Class-8 Reproduction in Plants Question and Answer
Something To Know
A. Fill in the blanks.
1. ___________ reproduce through the process of budding.
2. Pollen grains are produced by ___________.
3. The agents, that carry the pollen grains from anther to a stigma, are called ___________.
4. The fusion of a male gamete with a female gamete is called ___________.
5. Seeds of orchids get dispersed by ___________.
Answer: (1) Yeast (2) anther (3) pollinators (4) fertilisation (5) wind
B. Write True or False for the following statements.
| Questions | Answer (True/False) |
| 1. Yeast reproduces asexually through fragmentation. | False |
| 2. Sweet potato and dahlia use their roots for asexual reproduction. | True |
| 3. A unisexual flower has both stamen and pistil in it. | False |
| 4. Water can be an agent of pollination. | True |
| 5. Male and female gametes fuse to form the zygote. | True |
| 6. Seeds of pea and bean plant are formed in pods. | True |
Answer: (1) False (2) True (3) False (4) True (5) True (6) True
C. Tick the correct option.
1. Spirogyra reproduces asexually by-
Ans 1. fragmentation
2. Bryophyllum reproduces through its—
Ans 2. leaves
3. The reproductive part of the plant, for sexual reproduction. is its-
Ans 3. flower
4. Pollen grains contain the—
Ans 4. male reproductive cell
5. Fruit develops from the-
Ans 5. ovary
D. Answer the following questions in brief.
Q. 1. Name the two types of reproduction in plants.
Ans 1: Two types of reproduction in plants are:
(1) Asexual reproduction
(2) Sexual reproduction
Q. 2. Define vegetative reproduction.
Ans 2: It is a type of asexual reproduction in which a new plant grows through use of the vegetative parts (like root, stem or leaves) of the plant.
Q. 3. Give two examples of plants which reproduce through spore formation.
Ans 3: mosses and ferns
Q. 4. Name two artificial methods of vegetative propagation from stem.
Ans 4: Grafting and Layering
Q. 5. When is a flower said to be a bisexual flower?
Ans 5: A flower is said to be bisexual if it contains both stamens and pistils.
Q. 6. Name any three ways by which seeds are dispersed.
Ans 6: Air, water and animals are the three ways by which seeds are dispersed.
E. Answer the following questions.
Q. 1. In what ways is vegetative propagation better than sexual reproduction?
Ans 1: Vegetative propagation has a number of advantages over sexual reproduction. The plants, produces by this method, take less time to grow. They also bear flowers and fruits earlier than the plants produced from seeds. The new plants are exact copies of the parent plant and have the same desirable characteristics as those of their parent plant.
Q. 2. Draw a well labelled diagram to describe the parts of a flower.
Ans 2:
Q. 3. How is self pollination different from cross pollination?
Ans 3: Self-Pollination transfer pollen grains from the anther to the stigma of the same flower. This process can take place in the same flower or a different flower of the same plant. On the other hand, Cross-Pollination transfers pollen grains from the anther to the stigma of a different flower. this process can take place between two flowers present on different plants.
Q. 4. How are fruits formed?
Ans 4: After fertilisation has taken place in a flower, a zygote is formed which divides several times to form an embryo within the ovule. The ovule develops a tough protective coat around itself and is gradually converted into a seed. the ovary begins to grow and forms the fruit.
Q. 5. Why is dispersal of seeds necessary for growth of plants?
Ans 5: Dispersal of seeds help the plants to spread out and grow in new places, sometimes a long distance away from the parent plant. This is important because, if the seeds are not dispersed, a large number of germinating seedlings can grow very close to the parent plant. This will result in competition between all such seedlings, as well as the parent plant. The ‘competition is for getting light, space, water and nutrients; all of these are important for plants to be able to grow and survive. That is why the dispersal of seeds is necessary for the growth of plants.