Which of the following horizons is generally referred to as the illuvial zone?

Related Mcqs:

1. Which of the following horizons has the maximum amount of organic matter?

   A. Horizons A2 and B
   B. Horizon B only
   C. Horizon A1
   D. Horizons B and C

2. A minima rotation worth the name is specified which corresponds to the age at which the trees reach the exploitable size which is usually 120 years, but is 150 years for the deodar, fir and kail in the moist zone of Kaghan 200 years for the ry zone of ______

   A. Swat
   B. Naran
   C. Kaghan
   D. None of these

3. Melanization generally involves the following zone:

   A. Horizon-B
   B. Horizon-A
   C. Horizon-C
   D. All of these

4. These are generally, but not always, developed above the birch zone and in patches, sometimes extensive, within it, probably conditioned by edaphic and biotic factors, in Kashmir, Gilgit, Chitral and Hazara. This type ascends normally to ______ or more above the sub-alpine forests and climate must be similar but more severe than in sub-alpine forests:

   A. 140 m
   B. 150 m
   C. 160 m
   D. 170 m

5. Magnolia and oaks occur in the following zone:

   A. Tropical
   B. Sub-tropical
   C. Alpine
   D. Temperate

6. The zone of soil showing microbial activity around the roots of higher plants is called:

   A. Rhizosphere
   B. Rhizoplane
   C. Soil microflora
   D. All of these

7. Plants growing in alpine zone are dwarf due to:

   A. Low temperature
   B. High wind velocity
   C. High light intensity
   D. None of these

8. The classification of plant groups on the basis of temperature differentiating four zone such as megatherms was proposed by:

   A. Clements
   B. Raunkiaer
   C. Odum
   D. Warming

9. The temperature based zone at an altitude of 10,000 is:

   A. Tropical
   B. Sub-tropical
   C. Temperate
   D. Alpine

10. The transition zone between two different types of communities is called:

    A. Biome
    B. Ecotone
    C. Biological spectrum
    D. Biological clock