12th Grade > Biology
REPRODUCTION IN ORGANISMS MCQs
Total Questions : 69
| Page 3 of 7 pages
Answer: Option C. -> Both A and B
:
C
Heterogametes are a pair of gametes that differ in form, size, or behavior and occur typically as larger non-motile female gamete(ovum) and smaller motile male gamete(sperm).
Isogametes aregametes that havethe same size and structure as the one with which it unites.
The fusion of both types of gametes leads to the formation of a zygote.
:
C
Heterogametes are a pair of gametes that differ in form, size, or behavior and occur typically as larger non-motile female gamete(ovum) and smaller motile male gamete(sperm).
Isogametes aregametes that havethe same size and structure as the one with which it unites.
The fusion of both types of gametes leads to the formation of a zygote.
Answer: Option A. -> are oviparous
:
A
Fishes and amphibians lay unfertilized eggs. In these animals fertilization and development of embryo is external. Ovoviviparousanimals retain the fertilized eggs and the development of the embryo takes place inside the animal body. In viviparous animals the embryo is implanted in the female body and it derives nourishment from the parent.
:
A
Fishes and amphibians lay unfertilized eggs. In these animals fertilization and development of embryo is external. Ovoviviparousanimals retain the fertilized eggs and the development of the embryo takes place inside the animal body. In viviparous animals the embryo is implanted in the female body and it derives nourishment from the parent.
Answer: Option C. -> A is false but R is true
:
C
Algae and fungi have simple body organization and are involved in asexual reproduction during favourable conditions, as it is faster and becausegamete formation during sexual reproduction requires a lot of energy expenditure. At the onset of adverse conditions they switch tosexual mode of reproduction, to ensure that there is variations created which can probably survive the ensuing hard times. Sexual reproduction in these organismsoccurby the formation ofzygospores. A zygospore remains dormant while it waits for environmental cues, such as light, moisture, heat, or chemicals secreted by plants. When the environment is favorable, the zygospore germinates, meiosis occurs, and haploid vegetative cells are released. Therefore, the 'Assertion' statement is correct,the 'Reason' statement is correct and 'Reason' explains the 'Assertion'.
:
C
Algae and fungi have simple body organization and are involved in asexual reproduction during favourable conditions, as it is faster and becausegamete formation during sexual reproduction requires a lot of energy expenditure. At the onset of adverse conditions they switch tosexual mode of reproduction, to ensure that there is variations created which can probably survive the ensuing hard times. Sexual reproduction in these organismsoccurby the formation ofzygospores. A zygospore remains dormant while it waits for environmental cues, such as light, moisture, heat, or chemicals secreted by plants. When the environment is favorable, the zygospore germinates, meiosis occurs, and haploid vegetative cells are released. Therefore, the 'Assertion' statement is correct,the 'Reason' statement is correct and 'Reason' explains the 'Assertion'.
Answer: Option B. -> Fertilization
:
B
Fertilisation or Syngamy is the fusion of the male and the female gamete to form the diploid zygote. Double fertilization is a complex fertilization mechanism of flowering plants (angiosperms). This process involves the joining of a female gametophyte (megagametophyte, also called the embryo sac) with two male gametes (sperm). Pollination is the act of transferring pollen grains from the male anther of a flower to the female stigma. Parthenogenesis is the reproduction from an ovum without fertilization, especially as a normal process in some invertebrates and lower plants.
:
B
Fertilisation or Syngamy is the fusion of the male and the female gamete to form the diploid zygote. Double fertilization is a complex fertilization mechanism of flowering plants (angiosperms). This process involves the joining of a female gametophyte (megagametophyte, also called the embryo sac) with two male gametes (sperm). Pollination is the act of transferring pollen grains from the male anther of a flower to the female stigma. Parthenogenesis is the reproduction from an ovum without fertilization, especially as a normal process in some invertebrates and lower plants.
Answer: Option A. -> Hydra
:
A
Budding is a form of asexual reproduction in which a new organism develops from an outgrowth or bud due to cell division and an example of an organism which reproduces through budding is Hydra.
:
A
Budding is a form of asexual reproduction in which a new organism develops from an outgrowth or bud due to cell division and an example of an organism which reproduces through budding is Hydra.
Answer: Option C. -> Less number of offsprings are produced as fusion of male and female gametes is a chance.
:
C
In external fertilisation, large number of male and female gametes are produced at the same time and released into the surrounding water. As a result large number of offsprings are produced, but they are unprotected and thus extremely vulnerable to predators.
:
C
In external fertilisation, large number of male and female gametes are produced at the same time and released into the surrounding water. As a result large number of offsprings are produced, but they are unprotected and thus extremely vulnerable to predators.
Answer: Option B. -> Length of juvenile/ Vegetative phase
:
B
Bamboo (Bambusa) produces flowers only after 50-100 years, produce large number of fruits once in their lifetime and die. Another such example is the Neelakuranji (Strobilanthus kunthiana) which flowers synchronously after every 12 years, set seeds and die. And hence they are both monocarpic and not polycarpic. And only thing that they differ in is the juvenile phase which is longer for the Bamboo and shorter comparitively for strobilanthus.
:
B
Bamboo (Bambusa) produces flowers only after 50-100 years, produce large number of fruits once in their lifetime and die. Another such example is the Neelakuranji (Strobilanthus kunthiana) which flowers synchronously after every 12 years, set seeds and die. And hence they are both monocarpic and not polycarpic. And only thing that they differ in is the juvenile phase which is longer for the Bamboo and shorter comparitively for strobilanthus.
Answer: Option D. -> Both a & c
:
D
All the events of sexual reproduction that occur prior to fusion of gametes (fertilisation) are referred to as pre-fertilisation events. Two main events here are gametogenesis and gamete transfer. Which is followed by gametic fusion, thatis the fertilization event involving the fusion of gametes.
:
D
All the events of sexual reproduction that occur prior to fusion of gametes (fertilisation) are referred to as pre-fertilisation events. Two main events here are gametogenesis and gamete transfer. Which is followed by gametic fusion, thatis the fertilization event involving the fusion of gametes.
Answer: Option A. -> binary fission
:
A
Amoeba can reproduce under favourable as well as unfavourable conditions. In favourable conditions, it usually reproduces by the binary fission and in unfavourable conditions it reproduces by the multiple fission.
Binary fission is a kind of asexual reproduction. It is the most common form of reproduction in prokaryotes and occurs in some single-celled eukaryotes like Amoeba also. In binary fission, the fully grown parent cell splits into two halves, producing two new cells.
:
A
Amoeba can reproduce under favourable as well as unfavourable conditions. In favourable conditions, it usually reproduces by the binary fission and in unfavourable conditions it reproduces by the multiple fission.
Binary fission is a kind of asexual reproduction. It is the most common form of reproduction in prokaryotes and occurs in some single-celled eukaryotes like Amoeba also. In binary fission, the fully grown parent cell splits into two halves, producing two new cells.
Answer: Option D. -> Once in 50-100 yrs
:
D
Some plants are monocarpic i.e. they flower only once in their lifetime. Bamboo (Bambusa) produces flowers only after 50-100 years, produce large number of fruits once in their lifetime and die. Another such example is the Neelakuranji (Strobilanthus kunthiana) which flowers synchronously after every 12 years, set seeds and die.
:
D
Some plants are monocarpic i.e. they flower only once in their lifetime. Bamboo (Bambusa) produces flowers only after 50-100 years, produce large number of fruits once in their lifetime and die. Another such example is the Neelakuranji (Strobilanthus kunthiana) which flowers synchronously after every 12 years, set seeds and die.
Latest Videos
Latest Test Papers
Login With Google
Old way of Login
Login With Email