CBSE Class 7 Science Revision Worksheet Set R

Chapter 1 : Nutrition in Plants

Fill in the blanks :

1. The components of food which are necessary for our body are called _______________

2. Green plants synthesise their own food themselves by the process of __________________.

3. ______________________ is the mode of taking food by an organism and its utilization by the body.

4. Complex chemical substances such as ______________ are the products of photosynthesis.

5. ___________________ gas is produced during photosynthesis.

6. Organisms that are dependent on others for their nutrition are called ______________________

7. _________________ are the tiny pores present on the surface of the leaves and are surrounded by guard cells.

8. ____________________is the ultimate source of energy for all living organisms.

9. Organisms which derive their nutrition from dead decaying matter are called _______________.

10. Some organisms live together and share shelter and nutrients, this is called _____________________.

11. Carbohydrates are made up of _________,__________ and __________.

Name the following :

1. A bacterium that can take atmospheric nitrogen and convert it into a soluble form.

2. An insectivorous plant.

3. The mode of nutrition in mushrooms.

Learn and write the following questions and answers.

Question 1: What are the components of food?
Answer: Carbohydrates, proteins, fats, vitamins and minerals are the components of food.

Question 2: What is nutrition?
Answer: The process of utilization of food by a living organism to obtain energy is called nutrition.

Questions 3: What is autotroph?
Answer: Organisms that make their food themselves are called autotrophs.

Question 4: What is autotrophic mode of nutrition?
Answer: The mode of nutrition in which the organism makes its own food is called autotrophic mode of nutrition.

Question 5: Give some example of autotrophs.
Answer: All green plants, such as grass, mango, bougainvillea, etc. are the examples of autotrophs. Some bacteria also show autotrophic nutrition. Question

6: What is heterotrophic mode of nutrition?
Answer: The mode of nutrition in which an organism takes food from another organism is called heterotrophic mode of nutrition. The nutrition in animals and non-green plants is the example of heterotrophic mode of nutrition.

Question 7: Give examples of Heterotrophs.
Answer: Animals and non green plants are the examples of heterotrophs.

Question 8: What are saprotrophs?
Answer: Organisms which get their nutrition from dead or decaying plants in liquid form are called saprotrophs.

Question 9: What is the ultimate source of energy?
Answer: Sun is the ultimate source of energy.

Question 10: Why do farmers add nitrogenous fertilizers to the soil?
Answer: Farmers add nitrogenous fertilizers to the soil to fulfill the requirement of nitrogen of the plants. Nitrogen is necessary to synthesize proteins.

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