MCQ
In the immune system, interferons are a part of
- APhysiological barriers
- BCellular barriers
- CPhysical barriers
- DCytokine barriers.
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- Autogamy is genetically xenogamy
- Pollination occurs by air in grass
- Placenta is arranged in inner wall of ovary
- It is possible to store pollen grains in liquid nitrogen - $100^oC$
$(a)$ Population density is necessarily measured in numbers
$(b)$ Tiger census is often based on pug marks and fecal pellets
$(c)$ Biomass is not a meaningful measure to know population size.
$(d)$ Size of a population for any species is not a static parameter