NSEB topic read · 2 min
Read Taxis as a Survival Trade-off
Read orientation responses across conditions and link them to water balance and predation risk.
NSEB · Animal Behaviour · 1 linked question · 100% coverage
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Living-system questions are solved by matching a structure or organism to its function, process and stated condition.
Structure · The part being namedFunction · What that part doesCondition · The situation that changes the answer
Study deeper: NCERT Biology · Animal Behaviour
Combine light and humidity responses
Woodlice avoid light and seek humidity most strongly by day. At night their humidity response weakens while negative phototaxis remains, so they can explore drier areas more readily. Under severe dryness, a weak positive phototaxis can reflect a competing escape response. Taken together, the responses reduce dehydration and exposure to predators. Choose A and D.
OlympIQ exam lens
- ✓Negative phototaxis and positive hygrotaxis can jointly reduce dehydration and predation risk.
- ✓The strength of a taxis can change with time and water stress.
OlympIQ trap
Do not treat a response as fixed. Compare its direction and strength under every stated condition.
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