| 11. | The tissue which is responsible for secondary growth is – |
A. xylem | |
B. phloem | |
C. cambium | |
D. cortex |
| 12. | Where is commercial cork obtained? |
A. from xylem | |
B. from phloem | |
C. from cork cambium | |
D. from the vascular cambium |
| 13. | Phloem in plants is mainly responsible for – |
A. to feed | |
B. to transport amino acids | |
C. to carry oxygen | |
D. to carry water |
| 14. | In plants, ‘xylem’ is mainly responsible for – |
A. to feed | |
B. to carry amino acids | |
C. for water transport | |
D. to carry oxygen |
| 15. | By whom can the age of a tree be ascertained? |
A. measuring its height | |
B. by counting annual rings | |
C. counting the number of branches | |
D. there is no way to measure age |
| 16. | Where is Aerenchyma found? |
A. in lithophytes | |
B. in hydrophytes | |
C. in xerophytes | |
D. in mesophytes |
| 17. | Villamine tissue is found in Orchid? |
A. in shoots | |
B. in the roots | |
C. in the leaves | |
D. in flowers |
| 18. | Due to the activation of which of the following growth ring is formed? |
A. of the terminal edge | |
B. of the contained edge | |
C. External key | |
D. of primary education |
| 19. | Trees growing on the seashore do not have annual rings because |
A. the land is sandy | |
B. have climatic variations | |
C. there is no clear climatic variation | |
D. The atmosphere is abundantly moist |
| 20. | 50 annual rings are found in the transverse section of the old trunk of a tree. The age of the tree will be – |
A. 25 years | |
B. 49 years | |
C. 50 years | |
D. 100 years |
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