Which one of the following statements is correct?

1.	Extensive use of chemical fertilizers may lead to eutrophication of nearby water bodies
2.	Both Azotobacter and Rhizobium in root nodules of plants
3.	Cyanobacteria such as Anabaena and Nostoc are important mobilizers of phosphates and potassium for plant nutrition in the soil
4.	At present it is not possible to grow maize without chemical fertilizers

One of the important consequences of geographical isolation is:

1. no change in the isolated fauna

2. preventing speciation

3. speciation through reproductive isolation

4. random creation of new species

Flagellated male gametes are present in all three of which one of the following sets?

1. Anthoceros, Funaria, and Spirogyra

2. Zygnema, Saprolegnia, and Hydrilla

3. Fucus, Marsilea, and Calotropis

4. Riccia, Dryopteris, and Cycas

Molecular basis of organ differentiation depends on the modulation in transcription by:

1. RNA polymerase

2. ribosome

3. transcription factor

4. anticodon

Increased asthmatic attacks in certain seasons are related to:

1. hot and humid environment

2. eating fruits preserved in tin containers

3. inhalation of seasonal pollen

4. low-temperature 

Which of the following is a slime mould?

1. Rhizopus

2. Physarum

3. Thiobacillus

4. Anabaena

Which one of the following is an example of a negative feedback loop in humans?

Ergot of rye is caused by a species of:

1. Phytophthora

2. Uncinula

3. Ustilago

4. Claviceps

Geometric representation of age structure is a characteristic of:

1. Biotic community

2. Population

3. Landscape

4. Ecosystem

Which one of the following mammalian cells is not capable of metabolizing glucose to carbon dioxide aerobically?

1. White blood cells

2. Unsatiated muscle cells

3. Liver cells

4. Red blood cells