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(a) Name the two primate… (Class 12 Biology 2023, Q27)

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BiologyCBSE Class 12 · Board exam 2023, set 57/1/1 · 3 marks · Short answer

CBSE Class 12 Biology 2023: question 27

Set in the CBSE Class 12 board exam of 2023, paper 57/1/1, section C, question 27, for 3 marks. Try it first; the hints and our step-by-step solution are below.

Q27 · 3 marks · Short answerEvolution

(a) Name the two primate ancestors of the present day humans, who existed approximately about 15 million years ago.
(b) According to geological records, when and where did Australopithecines live ?
(c) Give two differences between Homo habilis and Homo erectus.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2023 board paper, set 57/1/1.

Hints

Open one hint at a time and try again before the next.

Hint 1

Their names end in '-pithecus'; one was more ape-like and the other more man-like.

Hint 2

Australopithecines lived in the grasslands of a continent famous for hominid fossils.

Hint 3

Compare cranial capacity and diet.

Step-by-step solution

Each step shows the marks it earns, as an examiner would award them. Checked by an independent re-solve from the question paper.

  1. (a) The two primates are Dryopithecus and Ramapithecus.

    1 mark

  2. (b) Time: about 2 million years ago (mya).

    ½ mark

  3. Place: the East African grasslands.

    ½ mark

  4. (c)

    Homo habilisHomo erectus
    Brain capacity about 650–800 ccBrain capacity about 900 cc
    Probably did not eat meatProbably ate meat
    1 mark

Answer: (a) Dryopithecus and Ramapithecus; (b) ~2 mya in East African grasslands; (c) brain capacity 650–800 cc vs 900 cc; H. habilis probably did not eat meat, H. erectus probably did

Where the marks are

  • Names Dryopithecus and Ramapithecus (½ + ½ mark)
  • Time about 2 mya (½ mark) and place East African grasslands (½ mark)
  • Two differences: brain capacity and meat eating (½ + ½ mark)

Revise the chapter

  • Chapter: Evolution (notes, formulas, where marks are lost and every past question)
Practise this chapterBoard-style questions from Evolution, one at a time, marked against the answer key and marking points.Back to the full paper2023 board paper, set 57/1/1: every question, by section.

The question is transcribed from the official paper; figures are described in words. The solution, hints and chapter tag are ours. Spotted an error? Write tosupport@questionbuddy.in.