NEET (Oct)2020 Biology PYQs

Organisms And Populations

1. A (A)-(IV), (B)-(II), (C)-(I), (D)-(III)
2. B (A)-(III), (B)-(II), (C)-(IV), (D)-(I)
3. C (A)-(II), (B)-(I), (C)-(III), (D)-(IV)
4. D (A)-(I), (B)-(III), (C)-(IV), (D)-(II)

Organisms And Populations

1. A Negative
2. B Both positive and negative
3. C Neutralized by natality
4. D Positive

Organisms And Populations

1. A Species richness decreases with increasing area of exploration
2. B Species richness increases with increasing area, but only up to limit
3. C There is no relationship between species richness and area explored.
4. D Species richness goes on increasing with increasing area of exploration

Ecosystem

1. A Detritus rich in sugars
2. B Warm and moist environment
3. C Presence of aerobic soil microbes
4. D Detritus richer in lignin and chitin

Ecosystem

1. A Phosphates are the major form of phosphorus reservoir
2. B Phosphorus solubilising bacteria facilitate the release of phosphorus from organic remains
3. C There is appreciable respiratory release of phosphorus into atmosphere
4. D It is sedimentary cycle

Biodiversity And Conservation

1. A (A) and (C)
2. B (A) and (D)
3. C (B) and (D)
4. D (A) and (B)

Environmental Issues

1. A Vehicular exhaust
2. B Allergy causing pollen
3. C Noise
4. D Particulates of size 2.5 micrometer or below

Microbes In Human Welfare

1. A Aspergillus niger
2. B Lactobacillus sp
3. C Saccharomyces cerevisiae
4. D Clostridium butylicum

Biotechnology Principles And Processes

1. A Amplification of DNA
2. B Cutting of separated DNA bands from the agarose gel
3. C Transfer of separated DNA fragments to synthetic membranes
4. D Collection of isolated DNA