Tag: reproduction and variation

Questions Related to reproduction and variation

Reproduction is not essential for an individual but to maintain the species.

botany modes of reproduction why do plants reproduce? reproduction and variation the life cycle of plants

  1. True

  2. False

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Correct Option: A
Explanation:

  • Reproduction is the process that ensures continuity of species. All Individuals of any species die after their lifespan but some of them leave behind offsprings that will ensure continuity of species.
  • Sterile members of any species, worker bees, mule etc. Complete their lifespan without reproduction. Hence, reproduction is not essential for any individual. 

So, the correct option is 'True'.

State the following statements are true or false.
Presence or absence of hymen is not a reliable indicator of virginity or sexual experience.

botany modes of reproduction why do plants reproduce? reproduction and variation the life cycle of plants

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

The hymen is often torn during the first coitus. the presence or absence of the hymen is not a reliable indicator of virginity or sexual experience.

So, the correct option is 'True'.

Match Column I with Column II and select the correct option using the codes given below.

Column I Column II
A. Mons pubis 1. Embryo formation
B. Antrum 2. Sperm
C. Trophoectoderm 3. Female external genitalia
D. Nebenkern 4. Graafian follicle
botany modes of reproduction why do plants reproduce? reproduction and variation the life cycle of plants

  1. A - 3, B - 4, C - 2, D - 1

  2. A - 3, B - 4, C - 1, D - 2

  3. A - 3, B - 1, C - 4, D - 2

  4. A - 1, B - 4, C - 3, D - 2

Show answer
Correct Option: B
Explanation:

The mons pubis is the rounded eminence, made by fatty tissue beneath the skin, lying in front of the pubic symphysis. The antrum is the portion of an ovarian follicle filled with follicular fluid. The trophectoderm is a layer of cells on the outer edge of a blastocyst. These cells provide nutrients for the developing embryo, facilitate attachment to the uterine lining and become part of the placenta. The nebenkern is a mitochondrial formation in the sperm of some insects such as Drosophila.

 So the correct option is ' A - 3, B - 4, C - 1, D - 2 '.

The process of development of organism like itself is called-

botany modes of reproduction why do plants reproduce? reproduction and variation the life cycle of plants

  1. Budding

  2. Flowering

  3. Reproduction

  4. None of the above.

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Correct Option: C

Only variations that confer an advantage to an individual organism will survive in a population. 

botany modes of reproduction why do plants reproduce? reproduction and variation the life cycle of plants

  1. True

  2. False

Show answer
Correct Option: A
Explanation:
All the variations do not have an equal chance of surviving in the environment in which they find themselves. The chances of surviving depend on the nature of variations. Different individual would have different kind of advantages. A bacteria that can withstand heat will survive better in a heat wave. Selection of variants by environmental factors forms the basis for revolutionary process.

Reproductive whorls of a flower are :

botany modes of reproduction why do plants reproduce? reproduction and variation the life cycle of plants

  1. Stamens and carpels

  2. Sepals and petals

  3. Sepals and stamens

  4. Petals and carpels

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Correct Option: A

| | List I | | List II | | A | Internal fertilization | 1 | Ovum | | B | External fertilization | 2 | Sperm | | C | Male gamete | 3 | Hen | | D | Female gamete | 4 | Hydra | | E | Budding | 5 | Frog | | F | Binary fission | 6 | Fertilised egg | | G | Zygote | 7 | Amoeba |

lifespan reproduction and variation zoology plant reproduction different modes of reproduction sexual and asexual reproduction lifespan, reproduction and variation

  1. A- 3, B- 5, C- 1, D- 2, E- 4, F- 7, G- 6

  2. A- 3, B- 5, C- 2, D- 1, E- 7, F- 4, G- 6

  3. A- 3, B- 5, C- 2, D- 1, E- 4, F- 7, G- 6

  4. A- 6, B- 5, C- 2, D- 1, E- 4, F- 7, G- 3

Show answer
Correct Option: C
Explanation:

The fertilization which takes place inside the female's body is called internal fertilization, hen shows internal fertilization.
The fertilization which takes outside the female's body is called external fertilization as in the case of frogs.
Sperm is the male reproductive cell or the male gamete.
Ovum is the female reproductive cell or the female gamete.
Budding is a form of asexual reproduction in which a new organism develops from an outgrowth or bud due to the cell division at that particular site as in case of hydra.
Binary fission is a form of asexual reproduction used by all prokaryotes (including amoeba) where the cell divides into two nearly equal-sized daughter cells.
A zygote is a diploid cell that is formed by the fusion of male and female gamete. So, the fertilized egg is the zygote.
Thus, the correct answer is option C.