MCQ
Biological concept of species is mainly based on
- ✓Reproductive isolation
- BMorphological features only
- CMethods of reproduction only
- DMorphology and methods of reproduction
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| Column $I$ | Column $II$ |
| $A.$ Synapsis aligns homologous chromosomes | $(i)$ Anaphase $II$ |
| $B.$ Synthesis of $RNA$ and protein | $(ii)$ Zygotene |
| $C.$ Action of enzyme recombinase | $(iii)$ $G_2$ phase |
| $D.$ Centromeres do not separate but chromatids move towards opposite poles | $(iv)$ Anaphase $I$ |
| $(v)$ Pachytene |
$(1)$ The trophic levels in $GFC$ are unlimited
$(2)$ Organisms at each trophic level depend on those at the higher trophic level for their energy demands.
$(3)$ Plants capture only $2 -10$ percent of $PAR$.
$(4)$ All organisms are dependent for their food on producers, either directly or indirectly.