The main function of bulliform cells in grasses is :
to make the leaf impermeable to fungal spores.
to transport water.
to perform photosynthesis.
to minimize water loss during water stress.
Identify the correct sequence of steps in each cycle of Polymerase Chain Reaction :
Extension → Annealing → Denaturation
Annealing → Denaturation → Extension
Denaturation → Extension → Annealing
Denaturation → Annealing → Extension
$$ \text { Match List I with List II : } $$
| List-I (Phase of cell cycle) |
List-II (Activity) |
||
|---|---|---|---|
| A. | $\mathrm{G}_1$ phase | I. | Actual cell division occurs |
| B. | S phase | II. | Cell is metabolically active and continuously grows but does not replicate its DNA |
| C. | $\mathrm{G}_2$ Phase | III. | Synthesis of DNA occurs and the amount of DNA per cell doubles |
| D. | M phase | IV. | Proteins are synthesized while cell growth continues |
Choose the correct answer from the options given below :
A-IV, B-I, C-II, D-III
A-I, B-II, C-III, D-IV
A-III, B-IV, C-I, D-II
A-II, B-III, C-IV, D-I
Which of the following statements are correct?
A. The Amazon rainforest being cut and cleared for cultivation of soyabeans is an example of habitat loss.
B. Steller's sea cow and passenger pigeon became extinct due to over-exploitation by humans.
C. The Nile perch introduced into Lake Victoria in East Africa helped in population growth of cichlid fish in the lake.
D. Water hyacinth is an invasive species.
E. When a species becomes extinct, the plant and animal species associated with it are not affected.
Choose the correct answer from the options given below:
A, B and E only
A, B and D only
C, D and E only
B, C and D only
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