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NEET Biology Solved Question Paper 2004

Multiple Choice Questions

Which one feature is common to leech, cockroach and scorpion

Nephridia
Cephalisation
Ventral nerve cord
Antenna

Unidirectional transmission of a nerve impulse through nerve fibre is due to the fact that

nerve fibre is insulated by a medullary sheath
sodium pump starts operating only at the cyton and then continues into the nerve fibre
neurotransmitters are released by dendrites and not by axon endings
neurotransmitters are released by the axon endings and not by dendrites.

The total number of nitrogenous bases in human genome is estimated to be about

3.5 million
35 thousand
35 million
3.1 billion.

In which one of the following pairs the two items mean one and the same thing

Malleus - anvil
SA node - pacemaker
Leucocytes - lymphocytes
Haemophilia - blood cancer

Which one of the following categories of organisms do not evolve oxygen during photosynthesis

Red algae
Photosynthetic bacteria
C₄ plants with Kranz anatomy
Blue green algae

6.
The bacteria Pseudomonas aeruginosa is useful because of its ability to

transfer genes from one plant to another

decompose a variety of organic compounds

fix atmospheric nitrogen in the soil

produce a wide variety of antibiotics

decompose a variety of organic compounds

Pseudomonas aeruginosa is a Gram-negative, aerobic rod belonging to the bacterial family Pseudomonadaceae. These bacteria are common inhabitants of soil water. They occur regularly on the surfaces of plants and occassionally on the surfaces of animals.

• The bacterium will grow in the absence of O₂ if NO₂ is available as a respiratory electron acceptor.
• They possesses the metabolic versatility. Organic growth factors are not required, and it can use more than thirty organic compounds for growth. Pseudomonas aeruginosa is often observed growing in "distilled water" which is evidence of its minimal nutritional requirements.
• It is able to grow at temperatures as high as 42 degrees.
• Its tolerance to a wide variety of physical conditions, including temperature, contributes to its ecological success and makes it suitable for decomposing a variety of organic compounds in varied environmental conditions.