How Do Organisms Reproduce MCQ
1. In the list of organisms given below, those that reproduce by the asexual method are
(i) banana
(ii) dog
(iii) yeast
(iv) Amoeba
(a) (ii) and (iv)
(b) (i), (iii) and (iv)
(c) (i) and (iv)
(d) (ii), (iii) and (iv)
Ans. (b) (i), (iii) and (iv)
Explanation: Dog never reproduces asexually. Yeast and amoeba always reproduce asexually. Cultivated varieties of banana always reproduce asexually.
2. In a flower, the parts that produce male and female gametes (germ cells) are
(a) stamen and anther
(b) filament and stigma
(c) anther and ovary
(d) stamen and style
Ans. (c) Anther and ovary
3. Which of the following is the correct sequence of events of sexual reproduction in a flower?
(a) pollination, fertilisation, seedling, embryo
(b) seedling, embryo, fertilisation, pollination
(c) pollination, fertilisation, embryo, seedling
(d) embryo, seedling, pollination, fertilization
Ans. (c) Pollination, fertilisation, embryo, seedling
Explanation: Fertilisation cannot happen without pollination. Embryo is formed after fertilization and seedling comes out of embryo.
4. Offspring formed by asexual method of reproduction have greater similarity among themselves because
(i) asexual reproduction involves only one parent
(ii) asexual reproduction does not involve gametes
(iii) asexual reproduction occurs before sexual reproduction
(iv) asexual reproduction occurs after sexual reproduction
(a) (i) and (ii)
(b) (i) and (iii)
(c) (ii) and (iv)
(d) (iii) and (iv)
Ans. (a) (i) and (ii)
Explanation: Statements (iii) and (iv) are incorrect because sexual and asexual reproduction do not follow a particular sequence. Moreover, there are many organisms which reproduce asexually only. Additionally, there are many other organisms which never show asexual reproduction.
5. Characters transmitted from parents to offspring are present in
(a) cytoplasm
(b) ribosome
(c) golgi bodies
(d) genes
Ans. (d) Genes
Explanation: Genes are responsible for transmission of characters from one generation to the next generation.
6. Characters that are transmitted from parents to offspring during reproduction show
(a) only similarities with parents
(b) only variations with parents
(c) both similarities and variations with parents
(d) neither similarities nor variations
Ans. (c) Both similarities and variations with parents
Explanation: A child shows certain similarities and certain variations in characters from parents. This shows characters in a child can be both similar as well as different than parents.
7. A feature of reproduction that is common to Amoeba, Spirogyra and Yeast is that
(a) they reproduce asexually
(b) they are all unicellular
(c) they reproduce only sexually
(d) they are all multicellular
Ans. (a) They reproduce asexually
Explanation: Number of cells in an organism does not decide if the organism would reproduce asexually or sexually. Hence options ‘b’ and ‘d’ are incorrect. These organisms never reproduce sexually and hence option ‘c’ is incorrect.
8. In Spirogyra, asexual reproduction takes place by
(a) breaking up of filaments into smaller bits
(b) division of a cell into two cells
(c) division of a cell into many cells
(d) formation of young cells from older cells
Ans. (a) breaking up of filaments into smaller bits
Explanation: Spirogyra shows reproduction by fragmentation.
9. The ability of a cell to divide into several cells during reproduction in Plasmodium
is called
(a) budding
(b) reduction division
(c) binary fission
(d) multiple fission
Ans. (d) Multiple fission
10. The correct sequence of reproductive stages seen in flowering plants is
(a) gametes, zygote, embryo, seedling
(b) zygote, gametes, embryo, seedling
(c) seedling, embryo, zygote, gametes
(d) gametes, embryo, zygote, seedling
Ans. (a) gametes, zygote, embryo, seedling.
Explanation: Gametes fuse during fertilization of form zygote. Zygote develops into embryo. Embryo produces seedling after germination of seed.
11. The number of chromosomes in parents and offsprings of a particular species remains constant due to
(a) doubling of chromosomes after zygote formation
(b) halving of chromosomes during gamete formation
(c) doubling of chromosomes after gamete formation
(d) halving of chromosomes after gamete formation
Ans. (b) halving of chromosomes during gamete formation
Explanation: During gamete formation, number of chromosomes becomes half. Due to this, number of chromosomes in zygote becomes same as in somatic cell of the organism. This ensures constant number of chromosomes in a particular species.
12. In Rhizopus, tubular thread-like structures bearing sporangia at their tips are called
(a) filaments
(b) hyphae
(c) rhizoids
(d) roots
Ans. (b) Hyphae
13. Vegetative propagation refers to formation of new plants from
(a) stem, roots and flowers
(b) stem, roots and leaves
(c) stem, flowers and fruits
(d) stem, leaves and flowers
Ans. (b) Stem, roots and leaves
Explanation: Vegetative propagation happens from vegetative parts of a plant. Stem root and leaves are vegetative parts.
14. Factors responsible for the rapid spread of bread mould on slices of bread are
(i) large number of spores
(ii) availability of moisture and nutrients in bread
(iii) presence of tubular branched hyphae
(iv) formation of round shaped sporangia
(a) (i) and (iii)
(b) (ii) and iv)
(c) (i) and (ii)
(d) (iii) and (iv)
Ans. (c) (i) and (ii)
Explanation: Large number of spores ensures survival of some spores even in adverse conditions. Moisture and nutrients in bread provide conducive environment for spores to produce new bread mould.
