Class 10 Biology



Reproduction

Exemplar Problems MCQ II

The correct sequence of reproductive stages seen in flowering plants is

  • Gametes, zygote, embryo, seedling
  • Zygote, gametes, embryo, seedling
  • Seedling, embryo, zygote, gametes
  • Gametes, embryo, zygote, seedling

    Answer: (a) Gametes, zygote, embryo, seedling

The number of chromosomes in parents and offsprings of a particular species remains constant due to

  • Doubling of chromosomes after zygote formation
  • Halving of chromosomes during gamete formation
  • Doubling of chromosomes after gamete formation
  • Halving of chromosomes after gamete formation

    Answer: (b) Halving of chromosomes during gamete formation

In Rhizopus, tubular thread-like structures bearing sporangia at their tips are called

  • Filaments
  • Hyphae
  • Rhizoids
  • Roots

    Answer: (b) Hyphae

Vegetative propagation refers to formation of new plants from

  • Stem, roots and flowers
  • Stem, roots and leaves
  • Stem, flowers and fruits
  • Stem, leaves and flowers

    Answer: (b) Stem, roots and leaves

Factors responsible for the rapid spread of bread mould on slices of bread are

  • Large number of spores
  • Availability of moisture and nutrients in bread
  • Presence of tubular branched hyphae
  • Formation of round shaped sporangia
  • (i) and (iii)
  • (ii) and (iv)
  • (i) and (ii)
  • (iii) and (iv)

    Answer: (c) (i) and (ii)

Length of pollen tube depends on the distance between

  • Pollen grain and upper surface of stigma
  • Pollen grain on upper surface of stigma and ovule
  • Pollen grain in anther and upper surface of stigma
  • Upper surface of stigma and lower part of style

    Answer: (c) Pollen grain in anther and upper surface of stigma

Which of the following statements are true for flowers?

  • Flowers are always bisexual
  • They are the sexual reproductive organs
  • They are produced in all groups of plants
  • After fertilisation they give rise to fruits
  • (i) and (iv)
  • (ii) and (iii)
  • (i) and (iii)
  • (ii) and (iv)

    Answer: (b) (ii) and (iv)

Which among the following statements are true for unisexual flowers?

  • They possess both stamen and pistil
  • They possess either stamen or pistil
  • They exhibit cross pollination
  • Unisexual flowers possessing only stamens cannot produce fruits
  • (i) and (iv)
  • (ii), (iii) and (iv)
  • (iii) and (iv)
  • (i), (iii) and (iv)

    Answer: (b) (ii), (iii) and (iv)

Which among the following statements are true for sexual reproduction in flowering plants?

  • It requires two types of gametes
  • Fertilisation is a compulsory event
  • It always results in formation of zygote
  • Offspring formed are clones
  • (i) and (iv)
  • (i), (ii) and (iv)
  • (i), (ii) and (iii)
  • (ii), (iii) and (iv)

    Answer:(c) (i), (ii) and (iii)