Bihar Board Class 12 Science Biology · Ch 1: Sexual Reproduction in Flowering Plants

Topics in this test

Difficulty: 1 easy · 8 medium · 21 hard

Sample questions with answers

The first 5 questions of this free test.

1. Q1. A gardener finds a fruit that has developed without fertilisation and therefore contains no seeds. This condition is called:

   • A. Apomixis
   • B. Parthenocarpy
   • C. Polyembryony
   • D. Parthenogenesis
   Solution

   Parthenocarpy is the development of fruit without fertilisation, producing seedless fruits such as banana.

2. Q2. In an apomictic plant that produces seeds without fertilisation, how will the genotype of the offspring most likely compare with that of the parent?

   • A. Half from male parent, half from female parent
   • B. Identical to the parent
   • C. Completely different from the parent
   • D. A 3 : 1 mix of parental traits
   Solution

   Apomixis produces seeds without meiosis or fertilisation, so the offspring are genetically identical (clones) to the mother plant.

3. Q3. Which one is the odd one out with respect to preventing self-pollination/promoting out-breeding?

   • A. Unisexual flowers on separate plants (dioecy)
   • B. Cleistogamy
   • C. Self-incompatibility
   • D. Different timing of pollen release and stigma receptivity
   Solution

   Self-incompatibility, dioecy and different maturation times all prevent self-pollination, whereas cleistogamy actually ensures self-pollination.

4. Q4. Match the pairs: (a) Chasmogamous flower (b) Cleistogamous flower (c) Geitonogamy (d) Xenogamy — with (i) pollen to another flower of same plant (ii) open flower allowing cross-pollination (iii) flower never opens, ensuring self-pollination (iv) pollen to a flower of a different plant.

   • A. a-iii, b-ii, c-iv, d-i
   • B. a-i, b-iv, c-ii, d-iii
   • C. a-ii, b-iii, c-i, d-iv
   • D. a-ii, b-iii, c-iv, d-i
   Solution

   Chasmogamous flowers open, cleistogamous never open, geitonogamy is between flowers of the same plant, and xenogamy is between different plants.

5. Q5. Assertion (A): Pollen grains of many species cause severe allergies. Reason (R): Pollen walls contain the highly resistant polymer sporopollenin which is not degraded by enzymes. Choose the correct option.

   • A. Both A and R are true but R is not the correct explanation of A
   • B. Both A and R are true and R is the correct explanation of A
   • C. A is false but R is true
   • D. A is true but R is false
   Solution

   Both A and R are true, but allergy is caused by the pollen's protein content and air-borne nature, not by sporopollenin, so R is not the correct explanation.

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