General Science 5th Class Chapter 3 Flowers and Seeds Solved Exercise

General Science

5th Class

Chapter 3

Flowers and Seeds

Questions

1. Encircle the correct option.

i. The given figure is of a dicot seed. Which statement is correct about it?

a. Endosperm is present which stores food

b. There is no role of cotyledon in storing food

c. Cotyledon stores food for embryo

d. Cotyledon appears in the form of protective cap

ii. In the given picture of a flower, which are the reproductive parts of the flower?

              

a. A, B and D        b. B, C and D

c. A, B and C        d. A, C and D

iii. The gram seed is covered by which structure?

a. Cotyledon        b. Seed coat        c. Plumule        d. Endosperm

iv. Which conditions are necessary for seed germination?

a. Water, soil and air, darkness        b. Air, water, light

c. Water, temperature, air        d. Temperature, soil, light

v. Which type of pollination is must for papaya?

a. Self-pollination        b. Cross pollination

c. Both type of pollination        d. None of these

2. Write short answers.

i. Can you tell the names and functions of the four parts of a flower?

Ans.

1.  Sepals: hey protect the internal structures.

2. Petals: They attract insects and birds towards the flower.

3. Stamen: It is the male reproductive part.

4. Carpel: It is the female reproductive part.

ii. How will you compare self pollination and cross pollination?

Ans.

Self-Pollination:

If pollen grains are transferred from the anther of a flower to the stigma of the same flower or to the stigma of the other flower of the same plant, it is called pollination. It takes place in pea, cotton and tomato, etc.

Cross-Pollination:

If pollen grains are transferred from the flower of one plant to the stigma of the flower of another plant of the same type, it is called cross pollination. It takes place in maize, papaya and rose, etc.

iii. Compare gram and maize seed.

Ans. 

Gram Seed:

1. It has two cotyledons.

2. Endosperm is absent.

3. Embryo is present at the center of the seed.

Maize Seed:

1. It has one cotyledon.

2. Endosperm is present.

3. Embryo is present at one side of the seed.

iv. Define reproduction.

Ans.

Reproduction is the process by which organisms produce new organisms of their own kind for the continuation of their generation.

v. Label the given picture:

Ans.

3. Constructed Response Questions:

i. Observe the given picture and tell what is the role of water in seed germination?

Ans. Water help in seed germination providing suitable environment and also provide softness to seed cover.

ii. Observe the given pictures. For which type of pollination, the shapes and structures of flowers are suitable?

Ans. In diagram the shape of a and b flowers and structure is suitable for cross pollination while c and d is suitable for self pollination.

4. Investigate:

If all the insects become extinct, what will be its effect on flowering plants?

Ans. If all the insects become extinct, there is no pollination occurred in flowering plants so the generation of plants will not increase in large variety.

5. Project:

i. Collect five different types of flowers. See in which flowers sepals, petals, stamen, and carpels are present and in which these are not present. Compare these structures in different flowers.

ii. Using low-cost or no-cost materials, make a model of flower. Picture four models are given, for your guidance.

Ans: Practical Work