Grass leaves curl inwards during very dry weather. Select the most appropriate reason from the following :

1. Tyloses in vessels

2. Closure of stomata 

3. Flaccidity of bulliform cells

4. Shrinkage of air spaces in spongy mesophyll

What triggers the activation of protoxin to active Bt toxin of Bacillus thuringiensis in bollworms?

1. Acidic pH of the stomach

2. Body temperature 

3. Moist surface of midgut

4. Alkaline pH of the gut

Select the correctly written complete scientific name of Mango which was first described by Carolus Linnaeus:

1. Mangifera Indica

2. Mangifera indica Car. Linn.

3. Mangifera indica Linn.

4. Mangifera indica

Cells in ${\mathrm{G}}_0$ phase:
1. terminate the cell cycle
2. exit the cell cycle
3. enter the cell cycle
4. suspend the cell cycle

Phloem in gymnosperms lacks:

1. Both sieve tubes and companion cells 

2. Albuminous cells and sieve cells

3. Sieve tubes only

4. Companion cells only

Which of the following contraceptive methods involve the role of hormones?

Which of the following statements is incorrect?

It takes a very long time for pineapple plants to produce flowers. Which combination of hormones can be applied to artificially induce flowering in pineapple plants throughout the year to increase yield?

1. Cytokinin and Abscisic acid

2. Auxin and Ethylene

3. Gibberellin and Cytokinin

4. Gibberellin and Abscisic acid

Conversion of glucose to glucose-6-phosphate, the first irreversible reaction of glycolysis, is catalyzed by:

1. Phosphofructokinase

2. Aldolase

3. Hexokinase

4. Enolase

Consider following features:
a. Organ system level of organisation
b. Bilateral symmetry
c. True coelomates with segmentation of body