Crop plants grown in monoculture are:

1. low in yield

2. free from intraspecific competition

3. characterized by a poor root system

4. highly prone to pests

Montreal protocol which calls for appropriate action to protect the ozone layer from human activities was passed in the year:

1. 1986

2. 1987

3. 1988

3. 1985

The formula for exponential population growth is:

1. dt/dN= rN

2. dN/rN= dt

3. rN/dN= dt

4. dN/dt= rN

Which one of the following is not used for the construction of ecological pyramids?

Niche overlap indicates:

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