DNA polymorphism forms the basis of
1. Translation
2. Genetic mapping
3. DNA finger printing
4. Both genetic mapping and DNA fingerprinting
In old trees the greater part of secondary xylem is dark brown and resistant to insect attack due to :
| (a) | secretion of secondary metabolites and their deposition in the lumen of vessels. |
| (b) | deposition of organic compounds like tannins and resins in the central layers of stem. |
| (c) | deposition of suberin and aromatic substances in the outer layer of stem. |
| (d) | deposition of tannins, gum, resin and aromatic substances in the peripheral layers of stem. |
| (e) | presence of parenchyma cells, functionally active xylem elements and essential oils. |
Choose the correct answer from the options given below
| 1. | (b) and (d) Only | 2. | (a) and (b) Only |
| 3. | (c) and (d) Only | 4. | (d) and (e) Only |
Which of the following is not observed during apoplastic pathway?
| 1. | Apoplast is continuous and does not provide any barrier to water movement. |
| 2. | Movement of water occurs through intercellular spaces and wall of the cells. |
| 3. | The movement does not involve crossing of cell membrane |
| 4. | The movement is aided by cytoplasmic streaming |
Given below are two statements:
| Statement I: | Mendel studied seven pairs of contrasting traits in pea plants and proposed the Laws of Inheritance |
| Statement II: | Seven characters examined by Mendel in his experiment on pea plants were seed shape and colour, flower colour, pod shape and colour, flower position and stem height |
In the light of the above statements, choose the correct answer from the options given below:
| 1. | Statement I is incorrect but Statement II is correct |
| 2. | Both Statement I and Statement II are correct |
| 3. | Both Statement I and Statement II are incorrect |
| 4. | Statement I is correct but Statement II is incorrect |
Production of Cucumber has increased manifold in recent years. Application of which of the following phytohormones has resulted in this increased yield as the hormone is known to produce female flowers in the plants:
| 1. | Cytokinin | 2. | ABA |
| 3. | Gibberellin | 4. | Ethylene |
While explaining interspecific interaction of population, (+) sign is assigned for beneficial interaction, (-) sign is assigned for detrimental interaction and (0) for neutral interaction. Which of the following interactions can be assigned (+) for one species and (-) for another species involved in the interaction?
| 1. | Competition | 2. | Predation |
| 3. | Amensalism | 4. | Commensalism |
If a geneticist uses the blind approach for sequencing the whole genome of an organism, followed by assignment of function to different segments, the methodology adopted by him is called as:
| 1. | Bioinformatics | 2. | Sequence annotation |
| 3. | Gene mapping | 4. | Expressed sequence tags |
Which of the following occurs due to the presence of autosome linked dominant trait?
| 1. | Thalessemia | 2. | Sickle cell anaemia |
| 3. | Myotonic dystrophy | 4. | Haemophilia |
Which one of the following will accelerate phosphorus cycle?
| 1. | Rain fall and storms | 2. | Burning of fossil fuels |
| 3. | Volcanic activity | 4. | Weathering of rocks |
Read the following statements on lipids and find out correct set of statements:
| (a) | Lecithin found in the plasma membrane is a glycolipid |
| (b) | Saturated fatty acids possess one or more c=c bonds |
| (c) | Gingely oil has lower melting point, hence remains as oil in winter |
| (d) | Lipids are generally insoluble in water but soluble in some organic solvents |
| (e) | When fatty acid is esterified with glycerol, monoglycerides are formed |
Choose the correct answer from the options given below
| 1. | (a), (b) and (d) only | 2. | (a), (b) and (c) only |
| 3. | (a), (d) and (e) only | 4. | (c), (d) and (e) only |
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