Give reasons: Plants look green

CBSE Class 10 CBSE Class 10 Science
, ,
1

Give reasons:

  1. Plants look green.
  2. The respiratory surface of earthworm is its skin.
  3. Nutrition is necessary for an organism.
  4. We boil the leaf in alcohol when we are testing it for starch.

Answer:

  1. The leaves of plants contain green pigments called chlorophyll which is necessary for photosynthesis. Plants reflect green light of sunlight, so they look green.
  2. The skin of earthworm is quite thin and moist and has rich blood supply. So, it respires through its skin.
  3. An organism requires nutrients like carbohydrates, fats, proteins, minerals and vitamins for the growth, reproduction and metabolic activities, so nutridon is necessary for an organism.
  4. We boil the leaf in alcohol to remove chlorophyll from green leaf.