Heredity: Class 10 Previous Year Questions

Heredity questions asked in CBSE board exams

Repeated questions first. Open the free app to see each question as it appeared in the paper, with its marking scheme.

1. Mendel took garden pea plants with different characteristics, such as height to study the inheritance pattern of factors (genes). He crossed tall pea plant with short pea plant and obtained all the tall plants in the Fi generation. Answer the following questio…
   Board 20261 markMCQ
2. The genotype of green stemmed tomato plant is denoted by ‘GG’ and that of purple stemmed tomato plant as ‘gg’. Hybrid of a cross between these two were self-pollinated to obtain F2 progeny. What will be the ratio of GG, Gg and gg in this F2 progeny ? 1 (A) 2 :…
   Board 20261 markMCQ
3. Sex is determined by different factors in various species. However, in human beings, it is determined genetically. Which amongst the following option(s) is/are correct for human beings ? () Gamete carrying X chromosome from female parent (i) Gamete carrying X …
   Board 20261 markMCQ
4. (a) Giving two examples, justify the statement that the sex of the offspring in all animals is not always genetically determined. (b) Differentiate between the sex chromosomes of male and female human beings.
   Board 20261 markvery short
5. If pea plants with round and green seeds (RRyy) are crossed with pea plants having wrinkled and yellow seeds (rrYY), the seeds developed by the plants of F1 generation will be : (A) 50% round and green (B) 75% wrinkled and green (C) 100% round and yellow (D) 7…
   Board 20251 markMCQ
6. Plants have neither a nervous system nor muscles, even then they respond to stimuli. For example, the leaves of chhui-mui (touch-me-not) plant when touched begin to fold up and droop. (a) How is the information communicated in ‘‘touch-me-not’’ plants ? (b) Wha…
   Board 20253 marksshort answer
7. (a) What are chromosomes ? (b) Explain in brief how stability of DNA content of a species is ensured in sexually reproducing organisms ?
   Board 20253 marksshort answer
8. The lowest part of the ear called earlobe, is closely attached to the side of the head in some of us (Figure ‘X’), and not in others, called free earlobe (Figure ‘Y’). Attached and free earlobes are two variants found in human populations. The gene for free ea…
   Board 20253 marksshort answer
9. Assertion (A) : A mango seed will germinate to form a mango tree. Reason (R) : Heredity determines the process by which traits and characteristics are reliably inherited from parents to offspring.
   Board 20251 markAssertion-Reason
10. Assertion (A) : Human female has a perfect pair of sex chromosome. Reason (R) : Sex chromosome contributed by the human male in the zygote decides the sex of a child.
    Board 20241 markAssertion-Reason
11. Mendel worked out the rules of heredity by working on garden pea using a number of visible contrasting characters. He conducted several experiments by making a cross with one or two pairs of contrasting characters of pea plant. On the basis of his observations…
    Board 20244 markscase-based
12. ·Stability of DNA in a species is ensured during sexual reproduction." Justify the statement.
    Board 20242 marksshort answer
13. Chromosomes : (i) carry hereditary information from parents to the next generation. (ii) are thread like structures located inside the nucleus of an animal cell. (ii) always exist in pairs in human reproductive cells. (iv) are involved in the process of cell d…
    Board 20241 markMCQ
14. A cross made between two pea plants produces 50% tall and 50% short pea plants. The gene combination of the parental pea plants must be (A) Tt and Tt (B) TT and Tt (C) Tt and tt (D) TT and tt
    Board 20241 markMCQ
15. In order to trace the inheritance of traits Mendel crossed pea plants having one contrasting character or a pair of contrasting characters. When he crossed pea plants having round and yellow seeds with pea plants having wrinkled and green seeds, he observed th…
    Board 20234 marksshort answer
16. Assertion (A) : Genes inherited from the parents decide the sex of a child. Reason (R) : X chromosome in a male child is inherited from his father.
    Board 20231 markAssertion-Reason
17. H 14 H 26. h_ Vmbm~m| AWdm Prbm| H$s g\$mB© Zht H$aVo h¢, naÝVw {H$gr ObOrdembm H$mo {Z`{_V g\ ? 2 H 15 H 23. Mendel crossed a pure tall pea plant (TT) with a pure short pea plant (tt) and obtained all tall plants in F1 generation. (a) What is the gene combina…
    Board 20232 marksshort answer
18. The statement that correctly describes the characteristic(s) of a gene is : (a) In individuals of a given species, a specific gene is located on a particular chromosome. (b) A gene is not the information source for making proteins in the cell. (c) Each chromos…
    Board 20231 markMCQ
19. Name the two types of gametes produced by men. (a) /2+ /2 (b) Does a male child inherit X chromosome from his father ? Justify. /+1 (c) How many types of gametes are produced by a human female ?
    Board 20221 markMCQ
20. Which one of the two multicellular organisms Spirogyra and Planaria reproduces by regeneration and why ? Give an example of any other organism which can also reproduce by the same process. 2 4 5. (H$) {d{^ÞVm {H$go H$hVo h¢ ? CZ Xmo à_wI H$maUm| H$s gyMr ~ZmBE…
    Board 20221 markvery short

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