Which antibiotic inhibits the interaction between t-RNA and m-RNA using bacterial protein synthesis?
1. Erythromycin
2. Neomycin
3. Streptomycin
4. Tetracycline
Phenotype of an organism is the result of:
1. mutations and linkages
2. cytoplasmic effects and nutrition
3. environmental changes and sexual dimorpgism
4. genotype and environment interactions
Photochemical smog pollution does not contain:
1. ozone
2. nitrogen dioxide
3. carbon dioxide
4. PAN (Peroxy Acyl Nitrate)
Moss peat is used as a packing material for sending flowers and live plants to distant places because:
1. it is easily available
2. it is hygroscopic
3. it reduces transpiration
4. it serves as a disinfectant
A common structural feature of vessel elements and sieve tube elements is:
1. thick secondary walls
2. pores on lateral walls
3. presence of P-protein
4. enucleate condition
The thalloid body of a slime mould (Myxomycetes) is known as:
1. protonema
2. Plasmodium
3. fruiting body
4. mycelium
In which mode of inheritance do you expect more maternal influence among the offspring?
1. Autosomal
2. Cytoplasmic
3. Y-linked
4. X-linked
What type of placentation is seen in sweet pea?
1. Basal
2. Axile
3. Free-central
4. Marginal
Long filamentous threads protruding at the end of a young cob of maize are:
1. | anthers | 2. | styles |
3. | ovaries | 4. | hairs |
Conifers differ from grasses in the:
1. production of seeds from ovules
2. lack of xylem tracheids
3. absence of pollen tubes
4. formation of endosperm before fertilization