Science Questions and Answers List

In human females, an event that reflects onset of reproductive phase is A. Growth of body B. Changes in hair pattern C. Change in voice D. Menstruation

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Offspring formed by asexual method of reproduction have greater similarity among themselves because 1. Asexual reproduction involves only one parent 2. Asexual reproduction does not involve gametes 3. Asexual reproduction occurs before sexual reproduction 4. Asexual reproduction occurs after sexual reproduction A. (i) and (ii) B. (i) and (iii) C. (ii) and (iv) D. (iii) and (iv)

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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

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Characters transmitted from parents to offspring are present in A. Cytoplasm B. Ribosome C. Golgi bodies D. Genes

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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

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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

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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

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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

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Factors responsible for the rapid spread of bread mould on slices of bread are 1. Large number of spores 2. Availability of moisture and nutrients in bread 3. Presence of tubular branched hyphae 4. Formation of round shaped sporangia A. (i) and (iii) B. (ii) and (iv) C. (i) and (ii) D. (iii) and (iv)

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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

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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

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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

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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

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Length of pollen tube depends on the distance between A. Pollen grain and upper surface of stigma B. Pollen grain on upper surface of stigma and ovule C. Pollen grain in anther and upper surface of stigma D. Upper surface of stigma and lower part of style

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In Rhizopus, tubular thread-like structures bearing sporangia at their tips are called A. Filaments B. Hyphae C. Rhizoids D. Roots

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Which of the following statements are true for flowers? 1. Flowers are always bisexual 2. They are the sexual reproductive organs 3. They are produced in all groups of plants 4. After fertilisation they give rise to fruits A. (i) and (iv) B. (ii) and (iii) C. (i) and (iii) D. (ii) and (iv)

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Which among the following statements are true for sexual reproduction in flowering plants? 1. It requires two types of gametes 2. Fertilisation is a compulsory event 3. It always results in formation of zygote 4. Offspring formed are clones A. (i) and (iv) B. (i), (ii) and (iv) C. (i), (ii) and (iii) D. (ii), (iii) and (iv)

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In the given figure, the parts A, B and C are sequentially A. Cotyledon, plumule and radicle B. Plumule, radicle and cotyledon C. Plumule, cotyledon and radicle D. Radicle, cotyledon and plumule

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Which among the following statements are true for unisexual flowers? 1. They possess both stamen and pistil 2. They possess either stamen or pistil 3. They exhibit cross pollination 4. Unisexual flowers possessing only stamens cannot produce fruits A. (i) and (iv) B. (ii), (iii) and (iv) C. (iii) and (iv) D. (i), (iii) and (iv)

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Reproduction is essential for living organisms in order to A. Keep the individual organism alive B. Fulfill their energy requirement C. Maintain growth D. Continue the species generation after generation

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