Here are the solutions to the questions: 1. Stomata are usually present on/at the: (i) lower layer of leaf (ii) upper layer of leaf (iii) tips of the leaf (iv) None of these. 2. The by-product of phot

here are the solutions to the questions:

1. Stomata are usually present on/at the:

   • (i) lower layer of leaf
   • (ii) upper layer of leaf
   • (iii) tips of the leaf
   • (iv) None of these
   • The correct option is $\boxed{\text{(i) lower layer of leaf}}$.

2. The by-product of photosynthesis is:

   • (i) water
   • (ii) sugar
   • (iii) oxygen
   • (iv) None of these
   • The correct option is $\boxed{\text{(iii) oxygen}}$.

3. To test the presence of starch, we need:

   • (i) sulphur
   • (ii) iodine
   • (iii) chlorophyll
   • (iv) None of these
   • The correct option is $\boxed{\text{(ii) iodine}}$.

4. Plants growing in hilly areas have:

   • (i) needle like leaves
   • (ii) broad and wax coated leaves
   • (iii) spines instead of leaves
   • (iv) None of these
   • The correct option is $\boxed{\text{(i) needle like leaves}}$.

5. Areas with lot of water and sticky soil are called:

   • (i) deserts
   • (ii) marshes
   • (iii) plains
   • The correct option is $\boxed{\text{(ii) marshes}}$.

6. Polar bear can survive in extreme cold due to:

   • (i) thick fur on its skin
   • (ii) strong legs
   • (iii) fat stored in its hump
   • (iv) None of these
   • The correct option is $\boxed{\text{(i) thick fur on its skin}}$.

7. Hibernation means:

   • (i) movement of animals from one place to another
   • (ii) ability of an animal to merge with its surroundings
   • (iii) a deep winter sleep
   • The correct option is $\boxed{\text{(iii) a deep winter sleep}}$.

8. Young one of a fish is called:

   • (i) spawn
   • (ii) fry
   • (iii) nymph
   • (iv) None of these
   • The correct option is $\boxed{\text{(ii) fry}}$.