NCERT Solution class 7 Science Chapter 1

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Chapter – 01     Nutrition in Plants

 

Chapter Exercise

Page Number – (09)

  1. Why do organisms take food?

Ans1. The organism take food because all organism need to take food to get energy for the maintenance, development and growth.

 

  1. Distinguish between a parasite and a saprotroph.

Ans2. Distinguish between a parasite and a saprotroph given below between table:-

Parasite Saprotroph
Organisms drive nutrition from the body of other living organisms (host) are parasite. It is defined as on organism which feeds on the metter that is decomposing from the dead organism.
Ex. Wasps, head lice etc. Ex. Bacteria and Mushrooms.

 

  1. How would you test the presence of starch in leaves?

Ans3. Presence of starch in leaves can be tested by iodine test. Iodine turns starch solution into blue – black colour. Pour few drops of dilute iodine solution on the boiled leaf. The leaf becomes blue-black which proves the presence of starch in it. The starch is a carbohydrate.

 

  1. Give a brief description of the process of synthesis of food in green plant.

Ans.4 Leaves are food factories of plants. The synthesis of food in plants occurs in leaves. Therefore, all the raw materials (Water, Carbon dioxide and Sunlight) must reach there. Water and minerals are transported to the leaves by the vessels which run like pipes throughout the root, the stem, the branches and the leaves. The leaves have green pigment called chlorophyll which helps leaves to capture the energy of the sunlight. This energy is used to synthesis (prepare) food from carbon dioxide and water.

 

  1. Show with the help of a sketch that plants are the ultimate source of food.

Ans5.

 

  1. Fill in the blanks:-
  1. Green plants are called __autotrophs__ since they synthesis their own food.
  2. The food synthesized by plants is stored as __starch
  3. In photosynthesis solar energy is absorbed by the pigment called __chlorophyll
  4. During photosynthesis plants take in __carbon dioxide__ and release __oxygen__ gas.

 

  2. Name the following:-
  3. A parasitic plant with yellow, slender and branched stem.
  4. A plant that is partially autotrophic.
  • The pores through Which Leaves exchange gases.

Ans7.  The answer are given following bellow:-

  1. Cuscuta.
  2. Pitcher Plant.
  • Stomata.

 

  1. Tick the Correct Answer:-
  2. Cuscuta is an example of:
  3. autotrophy
  4. parasite
  • saprotroph
  1. host
  2. The plant which traps and feeds on insects is:
  3. Cuscuta
  4. china rose
  • pitcher plant
  1. rose

Ans8. The answer are given following bellow:-

  1. Parasite
  2. Pitcher Plant.

 

  1. Match the items given in Column I with those in Column II:-

   Column I                                              Column II

Chlorophyll                                          Rhizobium

Nitrogen                                               Heterotrophs

Cuscuta                                                Pitcher Plants

Animals                                                Leaf

Insects                                                  Parasite

Ans9. Column I                                               Column II

Chlorophyll                                           Leaf

Nitrogen                                                Rizobium

Cuscuta                                                 Parasite

Animals                                                 Heterotrophs

Insects                                                   Picher Plants

 

  1. Mark ‘T’ if the statement is true and ‘F’ if it is false:-
  2. Carbon dioxide is released during photosynthesis. (T/F)
  3. Plants which synthesis their food are called saprotrophs. (T/F)
  • The product of photosynthesis is not a protein. (T/F)
  1. Solar energy is convertd into chemical energy during photosynthesis. (T/F)

 

Ans10. The answer are following below:-

  1. False (F), Carbon dioxide from atmosphere is taken by the plants and oxygen is released in the atmospheric during the process of photosynthesis.
  2. False (F), Plants which synthesis their food are called autotrophs.
  • True (T).
  1. True (T).

 

  1. Choose the correct option from the following:-

Which part of the plants takes in carbon dioxide from the air for photosynthesis?

  1. Root hair
  2. Stomata
  • Leaf veins
  1. Petals

Ans11. ii. Stomata

 

  1. Choose the Correct option from the following:-
  2. Roots
  3. stem
  • flowers
  1. Leaves

Ans12. iv. Leaves.

 

  1. Why do farmers grow many fruits and vegetable crops inside large green houses? What are the advantages to the farmers?

Ans13. The advantage of growing many fruits and vegetable crops inside large green houses are:-

  1. Protecting from heavy rain.
  2. Protecting from fast wind blowing.
  • Multi items Growing in a single field. etc.