Chapter 1 Nutrition in Plants Class 7 Notes
Hallo friends this is the chapter reletid to plant and its nutrition. This is the very importent chapter of science. Here you can get, Class 7 Science Chapter 1 Nutrition in Plants questions and answers, Chapter 1 nutrition in plants worksheet, Chapter 1 nutrition in plants questions and answers, Chapter 1 nutrition in plants mcq, NCERT Class 7 Science Chapter 1 Nutrition in Plants PDF, Science Class 7 Chapter 1 Question answer, Nutrition in plants for Class 7 PDF, Science Class 7 Chapter 1 Nutrition in Plants, Class 7 Science Chapter 1 PDF question answer so lets start this chapter Nutrition in Plants:-
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Science Class 7 Question answer,Chapter 1 Nutrition in Plants
Q.1 Why do organisms take food?
Ans :- All organisms require energy for their life processes. Plants prepare their food and acquire nutrients from abiotic components like soil, air, water and sunlight. On the other hand, animals need to get food from either plants or other animals to obtain nutrients; hence, animals need to take food to acquire nutrients and energy.
Q.2. Distinguish between a parasite and a saprophyte.
Ans :-
Saprophytes
Acquire nutrients from dead and decaying matter.
Example: Fungi
Parasites
Parasites live on or in a host and get their food at the expense of their host.
Example: Roundworm
Q. 3. How would you test the presence of starch in leaves?
Ans :- Take two potted plants of the same kind. Keep one in the dark for 72 hours and the other in the sunlight. Perform the iodine test with the leaves of both plants as given below. Now, leave the pot, which was earlier kept in the dark, undisturbed for 3–4 days and perform the iodine test again on its leaves.
Iodine test:
Put iodine solution on the leaf.
Observation:
Blue-black colour will be observed on the leaves of the plant kept in sunlight, which indicates the presence of starch.
Blue-black colour will not be observed on the leaves of plants kept in the darkroom. This indicates the absence of starch.
Q.4. Give a brief description of the process of synthesis of food in green plants.
Ans :- Green plants use a process called photosynthesis to prepare their food. The process is as follows:-
- Water is taken from the roots of the plant, and it is transported to the leaves of the plant.
- Carbon dioxide from the air enters the leaves through pores called stomata. This diffuses the cell containing chlorophyll.
- Water Molecule is broken down into Hydrogen and Oxygen with the help of sunlight.
- Hydrogen combines with Oxygen and Hydrogen to form carbohydrates.
- Photosynthesis is represented by the following equation.
6CO2+6H2O→C6H12O6+6O2.
Q. 5. Show with the help of a sketch that plants are the ultimate source of food.
sketch that plants are the ultimate source of food
Q.6. Fill in the blanks.
(a) Green plants are called __Autotrophs___ since they synthesise their own food.
(b) The food synthesised by plants is stored as ____Starch____.
(c) In photosynthesis, solar energy is absorbed by the pigment called ____Chlorophyll___.
(d) During photosynthesis, plants take in __Carbon dioxide(CO2)___ and release __Oxygen(O2)___ gas.
Q.7. Name the following.
i) A parasitic plant with a yellow, slender and branched stem.
Ans :-Cuscuta
ii) A plant that is partially autotrophic.
Ans :- Pitcher plant
iii) The pores through which leaves exchange gases.
Ans :- Stomata
Q. 8. Tick the correct answer.
(a) Cuscuta is an example of:
(i) autotroph
(ii) parasite
(iii) saprotroph
(iv) host
Ans :- (ii) Parasite
(b) The plant which traps and feeds on insects is:
(i) Cuscuta
(ii) China rose
(iii) pitcher plant
(iv) rose
Ans:- (iii) pitcher plant
Q. 9. Match the items given in Column I with those in Column II.
Column-I Column-II
Chlorophyll Rhizobium
Nitrogen Heterotrophs
Cuscuta Pitcher plant
Animals Leaf
Insects Parasite
Ans:-
Column-I Column-II
Chlorophyll Leaf
Nitrogen Rhizobium
Cuscuta Parasite
Animals Heterotrophs
Insects Pitcher plant
Q. 10. Mark ‘T’ if the statement is true and ‘F’ if it is false.
(i) Carbon dioxide is released during photosynthesis. (T/F)
Ans:- False
(ii) Plants which synthesise their food are called saprotrophs. (T/F)
Ans:- False
(iii) The product of photosynthesis is not a protein. (T/F)
Ans :- True
(iv) Solar energy is converted into chemical energy during photosynthesis. (T/F)
Ans :- True
Q. 11. Choose the correct option from the following:
Which part of the plant takes in carbon dioxide from the air for photosynthesis?
(i) Root hair (ii) Stomata (iii) Leaf veins (iv) Petals
Ans:- (ii) Stomata
12. Choose the correct option from the following:
Plants take carbon dioxide from the atmosphere mainly through their:
(i) roots (ii) stem (iii) flowers (iv) leaves
Ans:- (iv) leaves
13. Why do farmers grow many fruits and vegetable crops inside large greenhouses? What are the advantages to the farmers?
Ans:- Fruits and vegetable crops are grown in large greenhouses because it protects crops from external climatic conditions and provides suitable temperature for the growth of crops.
- Advantages to farmers while growing fruits and vegetable crops inside greenhouses are
- It protects crops from diseases and adverse climatic conditions.
- It protects crops from wind and rodents
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