Consider statements about evolution: 1. Variation is necessary for evolution. 2. Natural selection acts on phenotype. 3. Evolution occurs in individuals. Which are correct? MCQ with Answer and Explanation

Question

Consider statements about evolution: 1. Variation is necessary for evolution. 2. Natural selection acts on phenotype. 3. Evolution occurs in individuals. Which are correct?

A. 2 and 3 only

B. 1, 2 and 3

C. 1 and 3 only

D. 1 and 2 only

Answer: Option D

Solution (By JKSSB Mock Tests)

Genetic variation within a population provides the raw material upon which evolutionary forces act; without variation, evolution cannot occur. Natural selection acts directly on the phenotype (observable traits) of an organism, determining its survival and reproductive success. However, evolution is a population-level phenomenon; it involves changes in allele frequencies over generations, not changes occurring within a single individual's lifetime. Thus, statements 1 and 2 are correct.

This question belongs to: Science Biology

Request complete Subject PDF

Discuss this Question (0)

No comments yet. Be the first to start the discussion!

Practice More Biology Questions

Question #1

Share Report

The hormone that promotes the development of the mammary glands during pregnancy is:

A. Progesterone

B. Estrogen

C. Oxytocin

D. Prolactin

View Answer & Solution Discuss

Get Complete Subject PDF for Science

Correct Answer: Option A

Explanation:
Progesterone stimulates the development of alveolar tissue of the breasts during pregnancy. Estrogen promotes duct development. Prolactin initiates milk synthesis, oxytocin ejection.

This question belongs to: Science Biology

Question #2

Share Report

The scientist who discovered the bacterium that causes cholera was:

A. Filippo Pacini

B. Louis Pasteur

C. John Snow

D. Robert Koch

View Answer & Solution Discuss

Get Complete Subject PDF for Science

Correct Answer: Option A

Explanation:
Filippo Pacini first observed Vibrio cholerae in 1854, but Robert Koch later independently identified it and demonstrated its role. Koch is often credited, but Pacini's discovery was earlier. John Snow linked cholera to water.

This question belongs to: Science Biology

Question #3

Share Report

The type of joint found in the shoulder and hip is:

A. Pivot joint

B. Hinge joint

C. Ball and socket joint

D. Gliding joint

View Answer & Solution Discuss

Get Complete Subject PDF for Science

Correct Answer: Option C

Explanation:
The ball and socket joint (e.g., glenohumeral, hip) allows movement in multiple axes (flexion, extension, abduction, adduction, rotation). The rounded head of one bone fits into the cup-shaped socket of another. Hinge (elbow, knee) allows movement in one plane, pivot (neck) allows rotation, gliding (wrist) allows sliding.

This question belongs to: Science Biology

Explore All Biology MCQs