DAV Class 7 Science Chapter 9 Solutions

DAV Class 7 Science Chapter 9 Solutions: DAV Class 7 Science Book question answer Chapter 9 Reproduction in Plants is given below.

DAV Class 7 Science Chapter 9 Solutions

Highlights

• A. Fill in the blanks.
• B. True or False.
• C. Tick the correct option.
• D. Answer the following questions in brief.
• E. Answer the following questions.

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.

1. Yeast reproduces asexually through fragmentation.

2. Sweet potato and dahlia use their roots for asexual reproduction.

3. A unisexual flower has both stamen and pistil in it.

4. Water can be an agent of pollination.

5. Male and female gametes fuse to form the zygote.

6. Seeds of pea and bean plant are formed in pods.

Answer: (1) False (2) True (3) False (4) True (5) True (6) True

C. Tick the correct option.

Answer:

1. fragmentation

2. leaves

3. flower

4. male reproductive cell

5. ovary

D. Answer the following questions in brief.

Q. 1. Name the two types of reproduction in plants.

Answer: Two types of reproduction in plants are:

(1) Asexual reproduction 

(2) Sexual reproduction

Q. 2. Define vegetative reproduction.

Answer: 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.

Answer: mosses and ferns

Q. 4. Name two artificial methods of vegetative propagation from stem.

Answer: Grafting and Layering

Q. 5. When is a flower said to be a bisexual flower?

Answer: 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.

Answer: 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?

Answer:

Q. 2. Draw a well labelled diagram to describe the parts of a flower.

Answer: For diagram see page no. 134 of your book.

Q. 3. How is self pollination different from cross pollination?

Answer:

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 transfer 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?

Answer:

Q. 5. Why is dispersal of seeds necessary for growth of plants?

Answer:

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 dispersal of seeds necessary for growth of plants.