Niche overlap indicates:

1.	active cooperation between two species
2.	two different parasites on the same host
3.	sharing of one or more resources between the two species
4.	mutualism between two species

In photosystem-I, the first electron acceptor is:

1. ferredoxin

2. cytochrome

3. plastocyanin

4. an iron-sulphur protein

Treatment of seed at low temperature under moist conditions to break its dormancy is called:

1. sacrification

2. vernalization

3. chelation

4. stratification

Which one of the following is the most suitable, medium for culture of Drosophila melanogaster?

1. Moist bread

2. Agar agar

3. Ripe banana

4. Cow dung

Which one of the following is not included under in situ conservation?

1. Sanctuary

2. Botanical garden

3. Biosphere reserve

4. National park

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