Tropical regions show greatest level of species richness because
A. Tropical latitudes have remained relatively undisturbed for millions of years, hence more time was available for species diversification.
B. Tropical environments are more seasonal.
C. More solar energy is available in tropics.
D. Constant environments promote niche specialization.
E. Tropical environments are constant and predictable.
Choose the correct answer from the options given below.
Given below are two statements:
Statement I : Chromosomes become gradually visible under light microscope during leptotene stage.
Statement II : The beginning of diplotene stage is recognized by dissolution of synaptonemal complex.
In the light of the above statements, choose the correct answer from the options given below:
Match List I with List II
List - I | List - II | ||
---|---|---|---|
A. | Nucleolus | I. | Site of formation of glycolipid |
B. | Centriole | II. | Organization like the cartwheel |
C. | Leucoplasts | III. | Site of active ribosomal RNA synthesis |
D. | Golgi apparatus | IV. | For storing nutrients |
Choose the correct answer from the options given below:
Bulliform cells are responsible for