Examine the figure (A-D) given below and select the right option out of 1-4, in which all the four structures A, B, C, and D are identified correctly:
Options
| A | B | C | D | |
| 1. | Runner | Archegoniophore | Synergid | Antheridium |
| 2. | Offset | Antheridiophore | Antipodals | Oogonium |
| 3. | Sucker | Seta | Megaspore mother cell |
Gamma cup |
| 4. | Rhizome | Sporangiophore | Polar cell | Globule |
Which of the following representations shows the pyramid of numbers in a forest ecosystem?
| 1. | A | 2. | B |
| 3. | C | 4. | D |
Study the cycle shown below and select the option which gives the correct words for all four blanks A, B, C, and D:
Options:
| A | B | C | D | |
| 1. | Denitrification | Ammonification | Plants | Animals |
| 2. | Nitrification | Denitrification | Animals | Plants |
| 3. | Denitrification | Nitrification | Plants | Animals |
| 4. | Nitrification | Ammonification | Animals | Plants |
Which one of the following is a xerophytic plant in which the stem is modified into a flat green and succulent structure:
1. Casuarina
2. Hydrilla
3. Acacia
4. Opuntia
Leguminous plants are able to fix atmospheric nitrogen through the process of symbiotic nitrogen fixation. Which one of the following statements is not correct during this process of nitrogen fixation:
| 1. | Nodules act as sites for nitrogen fixation |
| 2. | The enzyme nitrogenase catalyses the conversion of atmospheric N2 to NH3 |
| 3. | Nitrogenase is insensitive to oxygen |
| 4. | Leghaemoglobin scavenges oxygen and is pinkish in colour |
Black (stem) rust of wheat is caused by:
1. Ustilago nuda
2. Puccinia graminis
3. Xanthomonas oryzae
4. Alternaria solani
Which of the following are used in gene cloning:
1. Lomasomes
2. Mesosomes
3. Plasmids
4. Nucleoids
Which one of the following can not be used for preparation of vaccines against plague:
| 1. | Avirulent live bacteria |
| 2. | Synthetic capsular polysaccharide material |
| 3. | Heat-killed suspensions of virulent bacteria |
| 4. | Formalin-inactivated suspensions of virulent bacteria |
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Which one of the following is now being commercially produced by biotechnological procedures:
1. Morphine
2. Quinine
3. Insulin
4. Nicotine
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