Very small animals are rarely found in polar regions because:

1.	Being smaller in size makes them highly vulnerable to predation.
2.	They have a larger surface area relative to their volume.
3.	Small size makes long distance migration difficult.
4.	Small sized animals lack insulating body layers.

Keoladeo National Park, host to migratory birds from Siberia, is in:

In animals, the organism, if unable to migrate, might avoid the stress by escaping in time. All the following would exemplify this except:

Under unfavorable conditions, many zooplankton species in lakes and ponds are known to enter a stage of suspended development called as:

Any attribute of the organism that enables the organism to survive and reproduce in its habitat is called as:
1. Adaptation
2. Phenotypic plasticity
3. Acclimatization
4. Norm of the reaction

All the following are adaptations in desert plants to minimize water loss except:
1. Thick cuticle
2. ${\mathrm{C}}_3$ photosynthesis
3. CAM pathway
4. Sunken stomata

According to Allen’s rule:

A thick layer of fat, blubber, beneath the skin is found in:
1. Terrestrial mammals of colder climates
2. Aquatic mammals of colder climates
3. Terrestrial mammals of warmer climates
4. Aquatic mammals of warmer climates

High altitude acclimatization in humans include all the following except:

For the purpose of ecological studies, the term population is applicable to individuals reproducing: