Science
The percentage of solar energy which is not converted into food energy by the leaves of green plants in a terrestrial ecosystem is about :
options
- 1%
- 10%
- 90%
- 99%
Related Questions
An old person is suffering from an eye defect caused by weakening of ciliary muscles and diminishing flexibility of the eye lens. If the defect of vision is ‘a’ which can be corrected by lens ‘b’, then ‘a’ and ‘b’ respectively are :
options
- Hypermetropia and convex lens
- Presbyopia and bifocal lens
- Myopia and concave lens
- Myopia and bifocal lens
Which of the following groups do not constitute a food chain ?
(a) Wolf, rabbit, grass, lion
(b) Plankton, man, grasshopper, fish
(c) Hawk, grass, snake, grasshopper, frog
(d) Grass, snake, wolf, tiger
options
- (a) and (d)
- (a) and (c)
- (b) and (c)
- (b) and (d)
Assertion (A) : Decomposition reactions are generally endothermic reactions.
Reason (R) : Decomposition of organic matter into compost is an exothermic process.
options
- (A) and (R) are true and (R) is the reason for (A).
- (A) and (R) are true and (R) is not the reason for (A).
- (A) is true, but (R) is false.
- (A) is false, but (R) is true.
Assertion (A) : A human child bears all the basic features of human beings.
Reason (R) : It looks exactly like its parents, showing very little variations.
options
- (A) and (R) are true and (R) is the reason for (A).
- (A) and (R) are true and (R) is not the reason for (A).
- (A) is true, but (R) is false.
- (A) is false, but (R) is true.