Class V: Science [Ch-1 Plants Reproduction]

 Define the terms:

1. Seed coat- Outer covering of the seed which protects it against germs, injury and harsh weather conditions is called seed coat.

2. Cotyledons- Fleshy part of the seed which stores food for the baby plant, is called cotyledon.

3. Germination- The process of growth of a plant from seed into a new plant, is called germination.

4. Seed dispersal- The process of scattering of seeds away from the parent plant, is called seed dispersal.

5. Explosion- Dispersal of seeds with pressure on bursting of the dried seed pod, is called explosion.

Answer in one line:

1. What is reproduction?

Ans. Reproduction is the process by which an organism produces new individuals.

2. What are the requirements of a plant to grow?

Ans. A plant needs air, water, nutrients, soil, sunlight and warmth to grow.

3. Name a few agents of seed dispersal.

Ans. Wind, water, human beings and animals are some agents of seed dispersal.

4. Name some parts of a plant from where new plants can grow?

Ans. New plants can grow from stems, roots and leaves of the parent plants.

5. What are monocotyledons?

Ans. Seeds having only one seed leaf are called monocotyledons.

6. What are dicotyledons?

Ans. Seeds having two seed leaves are called dicotyledons.

7. Name some seeds that we eat.

Ans. All the grains such as rice, wheat, pulses, etc are all seeds. Coriander, mustard and cumin are also seeds.

Answer in short:

1. Name the different ways plants disperse seeds, giving examples of each.

Ans. Ways of seed dispersal can be divided into four types-

I) Wind dispersal- Ex dandelion and orchid seeds.

II) Water dispersal- Ex coconut seeds and lotus seeds.

III) Animal dispersal- Ex burdock and cherry.

IV) Dispersal by explosion- Ex peas and beans 

2. How is water helpful in seed dispersal? Give examples.

Ans. Water helps the seed to float thousands of kilometers across seas and oceans.

Answer in detail 

1. Do humans help in seed dispersal. How? Give an example.

Ans. Humans also help in seed dispersal for Eg-

Human beings eat fruits like orange mango and the seeds are thrown away and when the seed gets the right conditions they germinate.

2. How do animals help in seed dispersal?

Ans. When the juicy fruits are eaten by animals only the juicy fleshy part is digested by animals.

Some seeds have hook-like structures like datura; these seeds catch on the fur of the animals and are carried away with them.

Experimental questions 

1. Why are flowers important for plants?

Ans. Flowers are reproductive part of the plant

Most of the plants like bear flowers once the flower blooms it turns into fruits. These fruits may have seeds inside them and these can give rise to a new plant.

Give reason 

1. Why is seed dispersal necessary?

Ans. Seed dispersal is necessary so that each seed may get enough nutrient space and sunlight and develop into a new plant.

CHAPTER COMPLETED