NCERT Class VII Science Solutions: Chapter 1-Nutrition in Plants Part 1 (For CBSE, ICSE, IAS, NET, NRA 2022)

Doorsteptutor material for CBSE/Class-7 is prepared by world's top subject experts: get questions, notes, tests, video lectures and more- for all subjects of CBSE/Class-7.

NCERT Class 7 Science Chapter 1: Nutrition in Plants

Question 1:

Why do organisms need to take food?


All organisms need to take food to get energy for the growth, development and maintenance of their bodies.

Question 2:

Distinguish between a parasite and a saprotroph.


Difference between a parasite and a saprotroph:

Difference between Parasite and Saprotroph
Organisms derive nutrition from the body of other living organisms (host) are parasites.Plants which derive nutrition from dead and decaying organisms are called saprophs.
Example: Cuscata (Amar bel)Example: Mush
As Showing in Images is a All Organisms Need to Take Food to …


Cuscuta Amarbel
As Showing in Images is a Result for Mushrooms

Question 3:

How would you test the presence of starch in leaves?


  • Take a potted plant with variegated leaves – for example, money plant or crotons.
  • Keep the plant in a dark room for three days so that all the starch gets used up.
  • Image Result for How Would You Test the Presence of Starch I …
  • Now select a leaf cover its portion with a black strip paper and keep the plant in sunlight for about six hours.
  • Pluck the leaf from the plant. Mark the uncovered area in it and trace them on a sheet of paper.
  • Dip the leaf in boiling water for a few minutes.
  • After this, immerse it in a beaker containing alcohol.
  • Carefully place the above beaker in a water-bath and heat till the alcohol begins to boil.
  • Now dip the leaf in a dilute solution of iodine for a few minutes.
  • Take out the leaf and rinse off the iodine solution.
  • You observe that the presence of starch in various areas of the leaf which was uncovered.

Developed by: