Tag: modes of reproduction

Questions Related to modes of reproduction

Reproduction, unlike other life processes, is not essential to maintain the life of an individual organism.

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 biological process by which new individual organisms or 'offsprings' are produced from their 'parents'. Reproduction is a fundamental feature of all known life; each individual organism exists as a result of reproduction. 
  • Though it is not essential, meaning, if someone does not reproduce, it will not end his life.

Therefore, the correct answer is option A.

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

Show answer
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

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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

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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

Fusion of two gametes which are dissimilar in size is termed as

botany modes of reproduction fertilization in organisms sexual reproduction in organisms reproduction in organisms

  1. Oogamy

  2. Isogamy

  3. Anisogamy

  4. Both A and C

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Correct Option: D
Explanation:
In anisogamy the fusing gametes differ in size and behaviour. One of the two gametes is larger and is called macrogamete or female gamete; the other is smaller and is termed microgamete or male gamete. In oogamy, there is a large food laden non-flagellate female gamete called egg or oosphere whereas the male gamete or antherozoid is smaller and motile. Oogamy is the familiar form of sexual reproduction, it is a form of anisogamy (heterogamy).
So, the correct answer is 'Both A and C'.

Life begin in all sexually reproducing organisms as a

botany modes of reproduction fertilization in organisms sexual reproduction in organisms reproduction in organisms

  1. Single-celled zygote

  2. Double-celled zygote

  3. Haploid zygote

  4. Haploid gametes

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Correct Option: A
Explanation:
Zygote is the vital link that ensures continuity of species between organisms of one generation and the next. Every sexually reproducing organism, including human beings begin life as a single cell - the zygote. 

Following table summarises the differences between self-fertilisation and cross-fertilisation. Pick out the wrong difference.

botany modes of reproduction fertilization in organisms sexual reproduction in organisms reproduction in organisms

  1. Self-fertilisation - It is uniparental, Cross-fertilisation - It is biparental

  2. Self-fertilisation - It involves the fusion of male and female gametes of the same parent, Cross-fertilisation - It involves the fusion of two gametes produced by different parents

  3. Self-fertilisation - Examples : Pheretima, Periplaneta, Cross-fertilisation - Examples : Taenia, Rana tigrina

  4. None of the above

Show answer
Correct Option: C
Explanation:

Self-fertilisation occurs in Taenia, while cross-fertilisation occurs in Pheretima, Periplaneta and Rana tigrina.