An element playing important role in nitrogen fixation is:
1. molybdenum
2. copper
3. manganese
4. zinc
Sertoli cells are found in:
| 1. | ovaries and secrete progesterone |
| 2. | adrenal cortex and secrete adrenaline |
| 3. | seminiferous tubules and provide nutrition to germ cells |
| 4. | pancreas and secrete cholecystokinin |
Which one of the following cannot be explained on the basis of Mendel's Law of Dominance?
| 1. | The discrete unit controlling a particular character is called a factor. |
| 2. | Out of one pair of factors, one is dominant, and the other recessive. |
| 3. | Alleles do not show any blending and both the characters recover as such in the F2 generation. |
| 4. | Factors occur in pairs. |
Apomictic embryos in Citrus arise from:
1. synergids
2. maternal sporophytic tissue in ovule
3. antipodal cells
4. diploid egg
One example of animals having a single opening to the outside that serves both as mouth as well as the anus is:
1. Octopus
2. Asterias
3. Ascidia
4. Fasciola
Select the correct statement from the ones given below:
| 1. | Barbiturates when given to criminals make them tell the truth |
| 2. | Morphine is often given to persons who have undergone surgery as a painkiller |
| 3. | Chewing tobacco lowers blood pressure and heart rate |
| 4. | Cocaine is given to patients after surgery as it stimulates recovery |
Listed below are four respiratory capacities (1-4) and four jumbled respiratory volumes of a normal human adult.
| Respiratory capacities | Respiratory volume | |
| (a) | Residual volume | 2500 mL |
| (b) | Vital capacity | 3500 mL |
| (c) | Inspiratory reserve volume | 1200 mL |
| (d) | Inspiratory capacity | 4500 mL |
Which one of the following is the correct matching of two capacities and volumes?
1. (a) 2500 mL, (d) 4500 mL
2. (c) 1200 mL, (a) 2500 mL
3. (b) 4500 mL, (c) 2500 mL
4. (d) 4500 mL, (b) 3500 mL
The chief water conducting elements of xylem in gymnosperms are:
1. vessels
2. fibres
3. transfusion tissue
4. tracheids
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