M.C.Q

MCQ 11 Mark

Characters that are transmitted from parents to offspring during reproduction show:

A
Only similarities with parents.
B
Only variations with parents.
✓
Both similarities and variations with parents.
D
Neither similarities nor variations.

Answer

Correct option: C.

Both similarities and variations with parents.

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.

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MCQ 21 Mark

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.

A
$(i)$ and $(iv)$
B
$(i), (ii)$ and $(iv)$
C
$(i), (ii)$ and $(iii)$
✓
$(i), (ii)$ and $(iv)$

Answer

Correct option: D.

$(i), (ii)$ and $(iv)$

Sexual reproduction involves fertilization of male and female gamete to produce zygote having genetic variations.

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MCQ 31 Mark

Which among the following is not the function of testes at puberty?

Formation of germ cells.
Secretion of testosterone.
Development of placenta.
Secretion of estrogen.

A
$(i)$ and $(ii)$
B
$(ii)$ and $(iii)$
✓
$(iii)$ and $(iv)$
D
$(i)$ and $(iv)$

Answer

Correct option: C.

$(iii)$ and $(iv)$

These events take place in females and not in males. Testes are present in males.

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MCQ 41 Mark

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.

A
$(i)$ and $(iii)$
B
$(ii)$ and $(iv)$
✓
$(i)$ and $(ii)$
D
$(iii)$ and $(iv)$

Answer

Correct option: C.

$(i)$ and $(ii)$

Bread mold prefers damp and warm substratum with ample supply of nutrients on which its air $-$ borne spores land and germinate to produce mycelium.

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MCQ 51 Mark

In Figure, the parts A, B and C are sequentially:

A
Cotyledon, plumule and radicle.
B
Plumule, radicle and cotyledon.
✓
Plumule, cotyledon and radicle.
D
Radicle, cotyledon and plumule.

Answer

Correct option: C.

Plumule, cotyledon and radicle.

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MCQ 61 Mark

The correct sequence of organs in the male reproductive system for transport of sperms is:

✓
Testis → vasdeferens → urethra.
B
Testis → ureter → urethra.
C
Testis → urethra → ureter.
D
Testis → vasdeferens → ureter.

Answer

Correct option: A.

Testis → vasdeferens → urethra.

Vas deferens delivers sperms from testes to urethra coming from the urinary bladder.

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MCQ 71 Mark

Vegetative propagation refers to formation of new plants from:

A
Stem, roots and flowers.
✓
Stem, roots and leaves.
C
Stem, flowers and fruits.
D
Stem, leaves and flowers.

Answer

Correct option: B.

Stem, roots and leaves.

Vegetative propagation happens from vegetative parts of a plant. Stem root and leaves are vegetative parts.

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MCQ 81 Mark

A feature of reproduction that is common to Amoeba, Spirogyra and Yeast is that:

✓
They reproduce asexually.
B
They are all unicellular.
C
They reproduce only sexually.
D
They are all multicellular.

Answer

Correct option: A.

They reproduce asexually.

All of them reproduce asexually.

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MCQ 91 Mark

The ability of a cell to divide into several cells during reproduction in Plasmodium is called:

A
Budding.
B
Reduction division.
C
Binary fission.
✓
Multiple fission.

Answer

Correct option: D.

Multiple fission.

Multiple fission is repeated division of organism to produce many daughter cells simultaneously.

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MCQ 101 Mark

Offspring formed by asexual method of reproduction have greater similarity among themselves because :

Asexual reproduction involves only one parent.
Asexual reproduction does not involve gametes.
Asexual reproduction occurs before sexual reproduction.
Asexual reproduction occurs after sexual reproduction.

✓
$(i)$ and $(ii)$
B
$(i)$ and $(iii)$
C
$(ii)$ and $(iv)$
D
$(iii)$ and $(iv)$

Answer

Correct option: A.

$(i)$ and $(ii)$

Asexual reproduction does not involve gamete formation and fertilization.

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MCQ 111 Mark

The correct sequence of reproductive stages seen in flowering plants is:

✓
Gametes, zygote, embryo, seedling.
B
Zygote, gametes, embryo, seedling.
C
Seedling, embryo, zygote, gametes.
D
Gametes, embryo, zygote, seedling.

Answer

Correct option: A.

Gametes, zygote, embryo, seedling.

Gametes fuse during fertilization of form zygote. Zygote develops into embryo. Embryo produces seedling after germination of seed.

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MCQ 121 Mark

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.
✓
Menstruation.

Answer

Correct option: D.

Menstruation.

Other changes; as shown in options happen in boys also.

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MCQ 131 Mark

Reproduction is essential for living organisms in order to:

A
Keep the individual organism alive.
B
Fulfill their energy requirement.
C
Maintain growth.
✓
Continue the species generation after generation.

Answer

Correct option: D.

Continue the species generation after generation.

Other life processes are essential for keeping the organism alive. Reproduction is essential to continue the lineage of an organism.

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MCQ 141 Mark

Which among the following diseases is not sexually transmitted?

A
Syphillis.
✓
Hepatitis.
C
HIV - AIDS.
D
Gonorrhoea.

Answer

Correct option: B.

Hepatitis.

Hepatitis is water borne viral disease.

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MCQ 151 Mark

Characters transmitted from parents to offspring are present in:

A
Cytoplasm.
B
Ribosome.
C
Golgi bodies.
✓
Genes.

Answer

Correct option: D.

Genes.

Genes are the stretch of DNA and determine genetic characters.

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MCQ 161 Mark

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.
✓
Pollination, fertilisation, embryo, seedling.
D
Embryo, seedling, pollination, fertilisation.

Answer

Correct option: C.

Pollination, fertilisation, embryo, seedling.

Fertilisation cannot happen without pollination. Embryo is formed after fertilization and seedling comes out of embryo.

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MCQ 171 Mark

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.
✓
Upper surface of stigma and lower part of style.

Answer

Correct option: D.

Upper surface of stigma and lower part of style.

To ensure pollination. Pollens should be able to reach the upper surface of stigma. This can be ensured by suitable length of pollen tube.

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MCQ 181 Mark

In the list of organisms given below, those that reproduce by the asexual method are :

Banana.
Dog.
Yeast.
Amoeba.

A
$(ii)$ and $(iv)$
✓
$(i), (iii)$ and $(iv)$
C
$(i)$ and $(iv)$
D
$(ii), (iii)$ and $(iv)$

Answer

Correct option: B.

$(i), (iii)$ and $(iv)$

Dog never reproduces asexually. Yeast and amoeba always reproduce asexually. Cultivated varieties of banana always reproduce asexually.

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MCQ 191 Mark

In Spirogyra, asexual reproduction takes place by:

✓
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.

Answer

Correct option: A.

Breaking up of filaments into smaller bits.

Spirogyra shows reproduction by fragmentation.

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MCQ 201 Mark

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.

A
$(i)$ and $(iv)$
B
$(ii)$ and $(iii)$
C
$(i)$ and $(iii)$
✓
$(ii)$ and $(iv)$

Answer

Correct option: D.

$(ii)$ and $(iv)$

Flowers are the sexual reproductive organs of a plant and a fertilized flower give rise to fruit.

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MCQ 211 Mark

Offspring formed as a result of sexual reproduction exhibit more variations because:

A
Sexual reproduction is a lengthy process.
✓
Genetic material comes from two parents of the same species.
C
Genetic material comes from two parents of different species.
D
Genetic material comes from many parents.

Answer

Correct option: B.

Genetic material comes from two parents of the same species.

Sexual reproduction produces genetic variations by meiosis during gamete formation and fertilization of male and female gametes.

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MCQ 221 Mark

In human males, the testes lie in the scrotum, because it helps in the:

A
Process of mating.
✓
Formation of sperm.
C
Easy transfer of gametes.
D
All the above.

Answer

Correct option: B.

Formation of sperm.

Scrotum provides lower temperature needed for sperm formation.

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MCQ 231 Mark

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

A
Filaments.
✓
Hyphae.
C
Rhizoids.
D
Roots.

Answer

Correct option: B.

Hyphae.

Thin branched filaments of fungi are called as hyphae.

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MCQ 241 Mark

In a flower, the parts that produce male and female gametes (germ cells) are:

A
Stamen and anther.
B
Filament and stigma.
✓
Anther and ovary.
D
Stamen and style.

Answer

Correct option: C.

Anther and ovary.

Anther produce pollen through microsporogenesis and ovary produce egg cell by megasporogenesis.

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MCQ 251 Mark

During adolescence, several changes occur in the human body. Mark one change associated with sexual maturation in boys:

A
Loss of milk teeth.
B
Increase in height.
✓
Cracking of voice.
D
Weight gain.

Answer

Correct option: C.

Cracking of voice.

Cracking of voice is one of the secondary sexual characters of human males.

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MCQ 261 Mark

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.

A
$(i)$ and $(iv)$
✓
$(ii), (iii)$ and $(iv)$
C
$(iii)$ and $(iv)$
D
$(i), (iii)$ and $(iv)$

Answer

Correct option: B.

$(ii), (iii)$ and $(iv)$

Since a unisexual flower has either stamen or pistil, hence cross pollination is necessary in them. Fruit is a mature ovary and hence a flower possessing only stamens cannot produce fruit.

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MCQ 271 Mark

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

A
Doubling of chromosomes after zygote formation.
✓
Halving of chromosomes during gamete formation.
C
Doubling of chromosomes after gamete formation.
D
Halving of chromosomes after gamete formation.

Answer

Correct option: B.

Halving of chromosomes during gamete formation.

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.

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