The zonels where no penetration of light occurs in a like:

Related Mcqs:

1. Plants adapted to low light intensity have:

   A. Higher rate of CO2 fixation than the sun plants
   B. More extended root system
   C. Leaves modified to spines
   D. Larger photosynthetic unit size than the sun plants

2. According to Geiger, the percentage of light reflected by the clouds is:

   A. 9%
   B. 10%
   C. 48%
   D. 39%

3. The percentage of light from total solar input utilized by plants:

   A. About 1%
   B. 3 – 5%
   C. 7 – 8%
   D. 14%

4. The orange and red wave lengths of light are able to penetrates in a sea upto a depth of:

   A. 5 meters only
   B. 20 meters only
   C. 50 meters
   D. 80-100 meters

5. If less light falls on a pond surface:

   A. The size of fishes becomes large
   B. The size of fish population becomes smaller
   C. The size of fish population is in no way connected with the amount of light falling on a pond
   D. Mutation will take place in fishes

6. Stratification occurs in:

   A. Desert
   B. Tropical forest
   C. Deciduous forest
   D. Tundra

7. The biological weathering occurs due to the action of:

   A. Acids
   B. Alkalies
   C. Oxygen
   D. Carbon dioxide

8. The soil formation occurs in the following consecutive stages:

   A. Weathering : sedimentation
   B. Weathering : pedogenesis
   C. Pedogenesis : weathering
   D. Sedimentation : pedogenesis

9. Water logging occurs:

   A. In sandy soil
   B. On gravels
   C. In loamy soil
   D. In clay soil

10. The rate at which light energy is converted into chemical energy of organic molecules is the ecosystem’s:

    A. Net primary productivity
    B. Gross secondary productivity
    C. Net secondary productivity
    D. Gross primary productivity