MCQ
Greater primary productivity depends upon
- ARain (humidity)
- BAvailability of nutrients
- ✓Both $(a)$ and $(b)$
- DNone of these
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$(1)$ Haemophilia is a sexlinked recessive disease.
$(2)$ Down’s syndrome is due to aneuploidy.
$(3)$ Phenylketonuria is an autosomal recessive gene disorder.
$(4)$ Sickle cell anaemia is an $X$-linked recessive gene disorder.