MCQ
Metamerically segmented body is present in
- AEarthworm
- BLeech
- CNereis
- ✓All of the above
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Assertion $(A)$:
Osteoporosis is characterised by decreased bone mass and increased chances of fractures.
Reason $(R)$ :
Common cause of osteoporosis is increased levels of estrogen.
In the light of the above statements, choose the most appropriate answer from the options given below:
| List-l (Interacting species) | List-II (Name of Interaction) |
| (A) Flamingoes and resident fishes | (I) Competition |
| (B) Lice on humans and ticks on dogs | (II) Parasitism |
| (C) Lichens | (III) Mutualism |
| (D) An orchid growing on a mango branch | (IV) Commensalism |
Reason: Monosomy lacks one pair of chromosomes.
The genes $a$ and $b$ could be of
$(a)$ High fertility rate
$(b)$ Rapidly rising mortality rate
$(c)$ Very young age distribution
$(d)$ Rapid population growth
$(e)$ Rapidly falling mortality rate
$(f)$ Very old age distribution