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A few stages and their… (Class 12 Biology 2025, Q19)

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BiologyCBSE Class 12 · Board exam 2025, set 57/7/1 · 2 marks · Very short answer

CBSE Class 12 Biology 2025: question 19

Set in the CBSE Class 12 board exam of 2025, paper 57/7/1, section B, question 19, for 2 marks. Try it first; the hints and our step-by-step solution are below.

Q19 · 2 marks · Very short answerCompetency-basedEvolution

A few stages and their respective time period in the evolutionary history of human beings are mentioned in the flowchart given below :
15 mya – Primates walking like gorillas and chimpanzees existed. (a)
↓
3 – 4 mya – Man-like primates walked in Eastern Africa. Fossils of their bones were discovered. (b)
↓
2 mya – This ancestor lived in the East African grasslands and ate fruits. (c)
↓
1·5 mya – This hominid had a brain size of 900 cc and probably ate meat. (d)
Based on the above information, answer the following questions :
(a) Name one primate about 15 mya.
(b) Name one place where fossils of primates were discovered in Eastern Africa.
(c) Name the ancestor that lived in the East African grasslands about 2 mya.
(d) Name the hominid that was found around 1·5 mya.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2025 board paper, set 57/7/1.

Hints

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

Hint 1

Recall the NCERT sequence of human evolution with its dates.

Hint 2

The 900 cc brain belongs to the hominid that came after Homo habilis.

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) Primate of about 15 mya: Dryopithecus (or Ramapithecus).

    ½ mark

  2. (b) Place of fossil discovery in Eastern Africa: Ethiopia (or Tanzania).

    ½ mark

  3. (c) Ancestor in the East African grasslands about 2 mya: Australopithecines.

    ½ mark

  4. (d) Hominid of about 1.5 mya, with a brain of about 900 cc that probably ate meat: Homo erectus.

    ½ mark

Answer: (a) Dryopithecus/Ramapithecus; (b) Ethiopia/Tanzania; (c) Australopithecines; (d) Homo erectus

Where the marks are

  • Dryopithecus or Ramapithecus (½ mark)
  • Tanzania or Ethiopia (½ mark)
  • Australopithecines (½ mark)
  • Homo erectus (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 paper2025 board paper, set 57/7/1: 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.