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Write two observations… (Class 10 Science 2026, Q15cii)

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ScienceCBSE Class 10 · Board exam 2026, set 31/1/1 · 2 marks · Very short answer

CBSE Class 10 Science 2026: question 15(c)(ii)

Set in the CBSE Class 10 board exam of 2026, paper 31/1/1, section A, question 15(c)(ii), for 2 marks. Try it first; the hints and our step-by-step solution are below.

Q15(c)(ii) · 2 marks · Very short answerHeredity

Write two observations made by Mendel about F1 progeny.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2026 board paper, set 31/1/1.

Hints

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

Hint 1

Think about the heights Mendel saw in F₁.

Hint 2

Was there any blending into medium height?

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. Observation 1: all plants of the F₁ progeny were tall.

    1 mark

  2. Observation 2: no short or medium-height plants appeared in F₁; the F₁ plants resembled only one parent (the tall one).

    1 mark

Answer: All F₁ plants were tall; no medium or short plants appeared (F₁ resembled only one parent).

Where the marks are

  • All F₁ plants tall (1 mark)
  • No medium/short plants, or F₁ resembled one parent only (1 mark)

Revise the chapter

  • Chapter: Heredity (notes, formulas, where marks are lost and every past question)
Practise this chapterBoard-style questions from Heredity, one at a time, marked against the answer key and marking points.Back to the full paper2026 board paper, set 31/1/1: 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.