Q1 MCQ Drill: 2020 Life Sciences P2 (2020 NSC October/November National Examination)

Life Sciences Past Paper Question 1 Drill Level 1: Knowledge & Recall

11:00

7 multiple-choice questions taken verbatim from Section A of the official 2020 NSC October/November National Examination Life Sciences Paper 2, auto-marked against the official marking guideline. Questions that rely on diagrams or graphs are excluded - see the full paper for those.

Question 1 of 7 2 Marks

Which ONE of the following may result in Down syndrome in humans?

A. A gene mutation on chromosome 21

B. Failure of chromosome pair 21 to separate during anaphase I

C. Failure of the gonosomes to separate during meiosis II

D. A gene mutation occurs on the X chromosome

Question 2 of 7 2 Marks

Variation within a species is introduced through …

A. random mating and asexual reproduction.

B. mitosis and random fertilisation.

C. random mating and random fertilisation.

D. mitosis and meiosis.

Question 3 of 7 2 Marks

African apes and humans are similar. Both have …

A. small jaws and well-developed brow ridges.

B. opposable thumbs and bare fingertips.

C. gaps between their teeth and eyes in front.

D. an upright posture and a cranial ridge.

Question 4 of 7 2 Marks

A homozygous purple flowering plant (P) is crossed with a pink flowering plant (p) to produce the F1-generation. One of the F1-plants is crossed with the pink flowering parent to produce the F2-generation. Which ONE of the following is the CORRECT phenotypic ratio of the F2-generation?

A. 1 purple : 1 pink

B. 1 purple : 3 pink

C. 3 purple : 1 pink

D. 1 purple : 2 pink

Question 5 of 7 2 Marks

Which ONE of the following scientists discovered fossils of Homo sapiens and Ardipithecus sp?

A. Raymond Dart

B. Lee Berger

C. Louis Leakey

D. Tim White

Question 6 of 7 2 Marks

Punctuated equilibrium suggests the following:

A. Evolution is always a slow and gradual process.

B. Natural selection does not explain evolution.

C. New species can appear quickly, over a relatively short period of time.

D. Artificial selection is the only mechanism that causes evolution.

Question 7 of 7 2 Marks

A group of students observed that the long-term use of antibiotics results in the decreased control of bacterial infections. From this observation the students stated that: Antibiotic resistance in bacteria is caused by the long-term use of antibiotics. This statement is a/an …

A. theory.

B. aim.

C. hypothesis.

D. conclusion.

Q1 MCQ Drill: 2020 Life Sciences P2 (2020 NSC October/November National Examination)

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