Class 4th Science Work 2022

 Ch 1: The green plant producer of food

Q1. What is called the kitchen of the plants?

Ans. Leaves are called the kitchen of plants

Q2. Define leaf blade.

Ans. The flat part of the leaf.

Q3. What is midrib?

Ans. The central vein of the leaf.

Q4. How will you define photosynthesis?

Ans. The process of making food by the plants in the presence of Sunlight and by the use of carbon dioxide, water and Minerals.

Q5. What are parasites?

Ans. Organisms which drive their food from other living organisms are called parasites.

Q6. Draw the structure of the leaf showing its various parts

Ans.

Q7. What is needed by leaf to make food?

Ans. Leaf needs Sunlight, Water air and Mineral to make food.

Q8. How does dodder get its food?

Ans. It takes the food prepared by the green plants.

Q9. What is the function of stomata?

Ans. Stomata help in the exchange of gases and transpiration

Q10. From where do non-green plants get their food?

Ans. Plants like mushrooms get their food from dead and decaying matter and some plants like dodder, they get their food from Green plants.

Q11. How will you test the presence of starch in a leaf?

Ans. 1. Take a leaf and boil it in water

2. then boil the leaf in alcohol thoroughly.

3. Wash the leaf under the cold water.

4. then perform the iodine test.

5. the colour of the leaf will be turn blue-black

This shows that the start is present in the leaf.

Q12. How do plants use the food prepared by them?

Ans. The food prepared in the form of glucose is used to get energy and the growth of the plant. Extra food is stored in the form of starch.

Q13. How do plants and animals interdependent?

Ans. Plants provide shelter and oxygen for animals. Animals provide carbon dioxide and help in pollination. In this way, plants and animals are interdependent.

Q14. Why is it important to maintain a balance between plants and animals in nature?

Ans. If the number of animals will increase, then the food provided by the plants will not be sufficient for the animals. If the number of plants increases, then the carbon dioxide requirement of the plants will not be met.

Ch 2: Plants Habitat

Keywords

1. Terrestrial plants: plants that grow on land

2. Mangroves: plants that grow in marshy areas

3. Insectivorous plants: insect-eating plants

4. Aquatic plants: plants that grow in water

Answer the following questions

Q1. On what basis can different plants be classified?

Ans. Plants can be classified on the basis of their habitat.

Q2. What is adaptation?

Ans. Adjustment with us rounded living conditions.

Q3. Name some important plants of the grass family.

Ans. Rice, wheat, jowar, sugarcane etc. are some important plants of the grass family.

Q4. What are saprophytic plants?

Ans. Plants which feed on dead and decaying matter.

Q5. What are the special features of submerged aquatic plants?

Ans. 1. They have narrow leaves

2. Roots are fixed in the soil

3. Stem is flexible

Q6. What are breathing roots? How do these help in marshy plants?

Ans. Marshy plants like mangroves have roots above the soil are called breathing roots. These help in the exchange of gases.

Q7. List some uses of grass family?

Ans. 1. They provide us food

2. Bamboo is used to make mats and chairs.

3. They are used to make medicines

4. They are used to make paper

5. They conserve soil.

Q8. How does the Venus flytrap plant trap insects?

Ans: Leaves of this plant are like a trap. When insects sit on them, they shut down to capture insects.