Available Answers

1. 1.

   Choose the correct answers to the questions from the given options:

   1. Which of the following is NOT a characteristic feature of tropical evergreen forests?
      1. Trees shed all their leaves at the same time.
      2. The forests have a large variety of species.
      3. Sunlight does not penetrate through the canopy.
      4. Trees display layered vegetation with climbers and epiphytes.
   2. Why is the exploitation of tropical evergreen forests for commercial purposes difficult?
      1. The forests are located in remote places.
      2. The forests have dense growth of trees occurring in mixed stands.
      3. The temperature range is too high for commercial activities.
      4. There is a lack of valuable tree species.
   3. Which of the following statements correctly explains why tropical deciduous forests are commercially important?
      1. They are located in accessible areas, making them fit for exploitation.
      2. The trees shed their leaves for 6-8 weeks in the dry season.
      3. The trees occur in pure stands, making exploitation east and the wood is of high economic value.
      4. The forests have a variety of species, making them rich in biodiversity.
   4. Which characteristic of the tropical deciduous forests help in water conservation during the dry season?
      1. Trees have broad leaves.
      2. Trees shed their leaves for about 6-8 weeks.
      3. The forests have a high humidity range.
      4. The temperature range is from 25°C to 27°C.
   5. Which of the following features helps xerophytic plants adapt to arid conditions?
      1. Large, broad leaves
      2. Shallow roots
      3. Thick, fleshy stems
      4. High transpiration rates
   6. Why do xerophytic plants often have leaves modified into hard thorns and sharp spines?
      1. To increase the rate of photosynthesis
      2. To reduce water loss and protect from grazing animals
      3. The laves of the plants are modified into spines to reduce water loss.
      4. The plants have thick, fleshy stems to store water.
   7. Which of the following is a unique characteristic feature of tidal forests?
      1. Plants have deep, long roots to draw water from underground.
      2. Plants have aerial roots that helps to obtain oxygen for respiration.
      3. The leaves of the plants are modified into spines to reduce water loss.
      4. The plants have thick, fleshy stems to store water.
   8. Why are plants in tidal forests supported by stilted roots?
      1. To increase the rate of photosynthesis
      2. To prevent water loss during dry seasons
      3. To support the plant during high tides when they get submerged under water
      4. To attract pollinators
   9. Why do changes in tree species occur with elevation in montane forests?
      1. Changes in soil type
      2. Changes in temperature and rainfall conditions
      3. Presence of different animal species
      4. Availability of sunlight
   10. Which of the following features helps coniferous trees in montane forests conserve water?
       1. Broad leaves that provide shade
       2. Deep roots that draw water from underground
       3. Needle-shaped leaves that give off less moisture through transpiration
       4. Large trunks that store water
2. 2.

   Define natural vegetation. State the factors that determine the growth of natural vegetation.

3. 3.

   Give three reasons to explain why forests are important to us.

4. 4.

   Give three suitable causes of shrinkage in forest cover in India.

5. 5.

   State three distinguishable features of each of the following types of forests:

   1. Tropical evergreen forest
   2. Tropical monsoon forest
   3. Tropical thorn forest
   4. Montane forests
6. 6.

   Enumerate the temperature and rainfall conditions required for the growth of the following types of forests:

   1. Tropical evergreen
   2. Tropical desert
   3. Tropical deciduous