| 11. | Marud trees have a long root system because – |
A. They provide mechanical strength to plants | |
B. Roots go deep to absorb water from deep aquifers | |
C. Higher soil temperature encourages root growth | |
D. Low night time temperatures encourage root growth |
| 12. | If the plants of the world die, due to lack of which all the animals will die? |
A. oxygen | |
B. wood | |
C. cool air | |
D. Meal |
| 13. | Epiphytes are found at those places where – |
A. The concentration of oxygen is high | |
B. the temperature is too low | |
C. it rains all year round | |
D. rain is seasonal |
| 14. | Myrmecophily is a beneficial association, of some flowering plants – |
A. among bacteria | |
B. among viruses | |
C. among the ants | |
D. between mycoplasma |
| 15. | The world’s largest ecosystem is – |
A. grassland | |
B. great lakes | |
C. Sea | |
D. Forest |
| 16. | The largest ecosystem of soil is – |
A. by overgrazing | |
B. by eliminating vegetation | |
C. by afforestation | |
D. increase in bird population |
| 17. | When we eat goat meat, we – |
A. are primary consumers | |
B. are secondary consumers | |
C. are tertiary consumers | |
D. None of these |
| 18. | From whom is solar energy obtained? |
A. moon | |
B. Sea | |
C. Sun | |
D. the air |
| 19. | Food chain means energy transfer by which of the following? |
A. underground to ground | |
B. of one organism to another | |
C. low latitude to high latitude | |
D. from land creatures to sea creatures by the river |
| 20. | Hydrophyte is called – |
A. to a sea animal | |
B. to a water plant | |
C. to a plant disease | |
D. to a rootless plant |