Advertisements
Advertisements
प्रश्न
Explain why very small animals are rarely found in polar region.
उत्तर
Loss of body heat is directly proportional to the surface area. Since, small animals have larger surface area relative to their volume. They tend to lose body heat at a very fast rate in colder regions. Loss of body heat in colder regions could prove threat to their survival. This is the reason why very small animals are rarely found in polar regions.
APPEARS IN
संबंधित प्रश्न
Give an example of an organism that enters 'diapause' and why.
In certain seasons we sweat profusely while in some other season we shiver. Explain.
State how the constant internal environment is beneficial to organisms.
Answer the following question.
Why are there more conformers than regulators in the animal world?
Match List - I with List - II.
| List I | List II | ||
| (a) | Allen's Rule | (i) | Kangaroo rat |
| (b) | Physiological adaptation |
(ii) | Desert lizard |
| (c) | Behavioural adaptation |
(iii) | Marine fish at depth |
| (d) | Biochemical adaptation |
(iv) | Polar seal |
Choose the correct answer from the options given below.
Assertion (A): A person goes to high altitude and experiences ‘altitude sickness’ with symptoms like breathing difficulty and heart palpitations.
Reason (R): Due to low atmospheric pressure at high altitudes, the body does not get sufficient oxygen.
In the light of the above statements, choose the correct answer from the options given below.
Salt concentration (Salinity) of the sea measured in parts per thousand is ______.
Name the association in which one species produces poisonous substance or a change in environmental conditions that is harmful to another species.
What is diapause and its significance?
Give one example for the following type.
Migratory animal
