Which two of the following changes (a – d) usually tend to occur in the plain dwellers when they move to high altitudes (3,500 m or more)?
| (a) | Increase in red blood cell size |
| (b) | Increase in red blood cell production |
| (c) | Increased breathing rate |
| (d) | Increase in thrombocyte count |
Changes occurring are:
1. (b) and (c)
2. (c) and (d)
3. (a) and (d)
4. (a) and (b)
Increased asthmatic attacks in certain seasons are related to:
| 1. | hot and humid environment |
| 2. | eating fruits preserved in tin containers |
| 3. | inhalation of seasonal pollen |
| 4. | low-temperature |