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Science · 2025 · 2 marks
CBSE 2025 · Region 4 · Set 2 · Q24
Pure-tall (TT) pea plants are crossed with pure-dwarf (tt) pea plants. The pea plants obtained in F_1 generation are then self pollinated to produce…
Pure-tall (TT) pea plants are crossed with pure-dwarf (tt) pea plants. The pea plants obtained in $\displaystyle \mathrm{F}_{1}$ generation are then self pollinated to produce $\displaystyle \mathrm{F}_{2}$ generation.
(i)
What do the plants of $\displaystyle \mathrm{F}_{1}$ generation look-like? Justify your answer.
(ii)
What is the ratio of pure-tall plants to pure-dwarf plants in $\displaystyle \mathrm{F}_{2}$ generation?
Marking-scheme solution
All tall
Tallness is a dominant trait
(ii) $\displaystyle 1$ : $\displaystyle 1$
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CBSE Class 10 Science past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.