NEET-UG 2015

NEET 2015 Cancelled Paper

Biology

Biology (Maximum Marks: 12)

This section contains 3 questions.
Each question has FOUR options (A), (B), (C) and (D). ONLY ONE of these four options is the correct answer.
Full Marks : +4 If ONLY the correct option is chosen;
Zero Marks : 0 If none of the options is chosen (i.e. the question is unanswered);
Negative Marks : −1 In all other cases.

Q.1

Which is the most common mechanism of genetic variation in the population of a sexually reproducing organism ?

(A)

Transduction

(B)

Chromosomal aberrations

(C)

Recombination

(D)

Genetic Drift

(C)

Solution

The most common cause of variations is recombination in the organism which are reproduced by sexual way

Q.2

Which of the following had the smallest brain capacity ?

(A)

Homo neanderthalensis

(B)

Homo erectus

(C)

Homo sapiens

(D)

Homo habilis

(D)

Solution

The brain capacity gradually increased from early human ancestors to modern man. Homo habilis had 650 - 800cc brain capacity which increased around 900cc in Homo erectus. The Neanderthal man (Homo neanderthalensis) had 1400cc brain capacity which evolved to around 1450cc in Homo sapiens.

Q.3

A population will not exist in Hardy-Weinberg equilibrium if

(A)

there are no mutations

(B)

individuals mate selectively

(C)

the population is large

(D)

there is no migration

(B)

Solution

The theory of Hardy- Weinberg equilibrium states that in the absence of disturbance on the level of genetic structure, a population’s existance will not continue. Thus mating should be in a random way.

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