Short Answer TypeSome organisms suspend their metabolic activities to survive in unfavourable conditions. Explain with the help of any four examples.
1. Bacteria forms thick-walled spores (cysts) unfavourable conditions and spores are shed on availability of suitable environment.
2. In higher plants, seeds remain dormant under unfavourable conditions and germinate under favourable moisture and temperature conditions.
3. Animals like bears undergo hibernation and suspend their metabolic activities to avoid the harsh winter conditions.
4. Under unfavourable conditions, many zooplankton species in lakes and ponds are known to enter diapause, a stage of suspended development.
Name the type of interaction seen in each of the following examples:
(i) Ascaris worms living in the intestine of human
(ii) Wasp pollinating fig inflorescence
(iii) Clown fish living among the tentacles of sea-anemone
(iv) Mycorrhizae living on the roots of higher plants
(v) Orchid growing on a branch of a mango tree
(vi) Disappearance of smaller barnacles when Balanus dominated in the Coast of Scotland.
Long Answer Type(a) List the different attributes that a population has and not an individual organism.
(b) What is population density ? Explain any three different ways the population density can be measured, with the help of an example each.
Short Answer TypeWith the help of one example, explain the phenomena of co-dominance and multiple allelism in human population.
Write the scientific name of the fruit-fly. Why did Morgan prefer to work with fruit-flies for his experiments? State any three reasons.
Describe the mutual relationship between fig tree and wasp and comment on the phenomenon that operates in their relationship.
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