How Do Organisms Reproduce
NCERT Exemplar Problems
MCQ Part 2
Question 10: 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
Question 11: 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
Question 12: In Rhizopus, tubular thread-like structures bearing sporangia at their tips are called
- Filaments
- Hyphae
- Rhizoids
- Roots
Answer: (b) Hyphae
Question 13: 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
Question 14: 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)
Question 15: 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
Question 16: 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)
Question 17: 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) - 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)
Question 18: Which among the following statements are true for sexual reproduction in flowering plants?