PYQ Vault

Day 114: CBSE Class 10 Science

5 questions (8 parts). Try each one first, then open its answer.

  1. Question 1

    Heredity. Asked once: 2025 (same type asked 4 times)

    32
    In one of Mendalian experiments, when F1\mathrm{F_1} generation pea plants with round yellow seeds were self-pollinated, pea seeds with the following combinations were obtained in F2\mathrm{F_2} generation :
    SeedsRound yellowRound greenWrinkled yellowWrinkled green
    Number80027526890
    Analyse the result and describe the mechanism of inheritance of traits which explains the above results.

  2. Question 2 (case study, 4 parts)

    Heredity. Asked once: 2023 (same type asked 4 times)

    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 that no plants with wrinkled and green seeds were obtained in the F1\mathrm{F_1} generation. When the F1\mathrm{F_1} generation pea plants were cross-bred by self-pollination, the F2\mathrm{F_2} generation had seeds with different combinations of shape and colour also.
    38 (a)
    Write any two pairs of contrasting characteristics of pea plant used by Mendel other than those mentioned above.
    38 (b)
    Differentiate between dominant and recessive traits.
    38 (c)
    State the ratio of the combinations observed in the seeds of F2\mathrm{F_2} generation (in the above case). What do you interpret from this result ?
    38 (c) OR
    Given below is a cross between a pure violet flowered pea plant (V) and a pure white flowered pea plant (v). Diagrammatically explain what type of progeny is obtained in F1\mathrm{F_1} generation and F2\mathrm{F_2} generation : Pure violet flowered plant ×\times Pure white flowered plant. (V V) (v v)

  3. Question 3

    How do Organisms Reproduce?. Asked once: 2026 (same type asked 4 times)

    16 (B)
    (i) Sugarcane does not produce seeds so name the process through which it will be able to reproduce. (ii) List any two advantages of this method. (iii) Besides sugarcane, give two more examples of plants that reproduce by this method. (iv) Why regeneration is not possible in all the types of animals ?

  4. Question 4

    How do Organisms Reproduce?. Asked once: 2025 (same type asked 4 times)

    10
    Select the option having correct matching of the organism given in Column I with the mode of reproduction in Column II :
    Column IColumn II
    P Leishmania1. Regeneration
    Q Spirogyra2. Multiple Fission
    R Planaria3. Binary Fission
    S Plasmodium4. Fragmentation
    5. Budding

    Tap an option to check your answer.

  5. Question 5

    How do Organisms Reproduce?. Asked once: 2025 (same type asked 4 times)

    6
    Match Column-I with Column-II and select the correct option from the choices provided.
    Column-IColumn-II
    a. Site of fertilisation of egg with the sperm(i) Vagina
    b. Site of implantation of embryo(ii) Uterus
    c. Site of entry of sperm into the female reproductive tract(iii) Oviduct
    d. Site through which the waste materials generated by the developing embryo are removed(iv) Placenta
    (v) Cervix

    Tap an option to check your answer.