12th Grade > Biology
GROWTH & REPRODUCTION IN PLANTS AND ANIMALS MCQs
Plant Growth And Development, Reproduction In Animals, Sexual Reproduction In Flowering Plants
Total Questions : 111
| Page 4 of 12 pages
Answer: Option C. -> Ovary
:
C
Ovary is a part of the female reproductive system. All other given options are parts of male reproductive system. Penis is the external genital organ in males. Testes are the main reproductive organs in males and producesperms. Vas deferens carry semen from testes to the urethra for ejaculation.
:
C
Ovary is a part of the female reproductive system. All other given options are parts of male reproductive system. Penis is the external genital organ in males. Testes are the main reproductive organs in males and producesperms. Vas deferens carry semen from testes to the urethra for ejaculation.
Answer: Option B. -> outside the female body
:
B
In animals which undergo external fertilisation, development of embryo takes place outside the female body. For e.g., in frogs, both males and females release their gametes in water. Fertilisationtakes place in the water, outside the body of both the parents. The development of the embryo also takes place in water.
:
B
In animals which undergo external fertilisation, development of embryo takes place outside the female body. For e.g., in frogs, both males and females release their gametes in water. Fertilisationtakes place in the water, outside the body of both the parents. The development of the embryo also takes place in water.
Answer: Option C. -> Parthenocarpic fruits
:
C
Parthenocarpy (virgin fruit) is the natural or artificially induced production of fruit without fertilisation of ovules, therefore the fruit is seedless. In some plants, pollination or other stimulants such as hormones are required for parthenocarpy. When plant hormones like auxins are sprayed on flowers, it could stimulate development of parthenocarpic fruits. This is termed as artificial parthenocarpy.
:
C
Parthenocarpy (virgin fruit) is the natural or artificially induced production of fruit without fertilisation of ovules, therefore the fruit is seedless. In some plants, pollination or other stimulants such as hormones are required for parthenocarpy. When plant hormones like auxins are sprayed on flowers, it could stimulate development of parthenocarpic fruits. This is termed as artificial parthenocarpy.
Answer: Option B. -> Tapetum nourishes the developing pollen
:
B
A microsporangium is generally surrounded by four wall layers – the epidermis, endothecium, middle layers and the tapetum. The outer three wall layers perform the function or protection and help in dehiscence of anther to release the pollen, the innermost wall layer is the tapetum. It nourishes the developing pollen grains. Cells of the tapetum are food righ and posses dense cytoplasm and generally have more than one nucleus. They disintegrate to liberate the contents which is absorbed by the developing spores. Outer most layer of the pollen grain is called exine and each haploid pollen grain develops from diploid sporogenous cell in the anther.
:
B
A microsporangium is generally surrounded by four wall layers – the epidermis, endothecium, middle layers and the tapetum. The outer three wall layers perform the function or protection and help in dehiscence of anther to release the pollen, the innermost wall layer is the tapetum. It nourishes the developing pollen grains. Cells of the tapetum are food righ and posses dense cytoplasm and generally have more than one nucleus. They disintegrate to liberate the contents which is absorbed by the developing spores. Outer most layer of the pollen grain is called exine and each haploid pollen grain develops from diploid sporogenous cell in the anther.
Answer: Option B. -> False
:
B
Exalbuminous ornon-endospermic seeds have no residual endosperm because they are completely consumed during embryo development.
:
B
Exalbuminous ornon-endospermic seeds have no residual endosperm because they are completely consumed during embryo development.
Answer: Option D. -> One
:
D
The megaspore mother cell (2n) undergoes reduction division (meiosis) to form linear tetrad of four haploid megaspores by megasporogenesis. Generally, 3 megaspores towards micropylar end degenerate and 4th towards chalazal end remains is the functional megaspore which develops into a female gametophyte or embryo sac.
:
D
The megaspore mother cell (2n) undergoes reduction division (meiosis) to form linear tetrad of four haploid megaspores by megasporogenesis. Generally, 3 megaspores towards micropylar end degenerate and 4th towards chalazal end remains is the functional megaspore which develops into a female gametophyte or embryo sac.
Answer: Option D. -> All of the above
:
D
Pre-fertilisation events in sexual reproduction are the events or processes that takes place before fusion of male female gametes.The two mainpre-fertilisation eventsare gametogenesis and gamete transfer. Gametogenesis is the process in which cells undergo meiosis to form gametes. Microsprogenesis is the process of reduction division of pollen mother cells into pollen grains (male gamete) and megasporogenesis is the process of reduction division of megaspore mother cell into megaspore which further develop into embryo sac (female gametophyte which includes the female gamete egg). Gamete transfer refers to the process of transfer of pollen grain to the stigma. This transfer further facilitates fusion of the gametes in the emryo sac.
:
D
Pre-fertilisation events in sexual reproduction are the events or processes that takes place before fusion of male female gametes.The two mainpre-fertilisation eventsare gametogenesis and gamete transfer. Gametogenesis is the process in which cells undergo meiosis to form gametes. Microsprogenesis is the process of reduction division of pollen mother cells into pollen grains (male gamete) and megasporogenesis is the process of reduction division of megaspore mother cell into megaspore which further develop into embryo sac (female gametophyte which includes the female gamete egg). Gamete transfer refers to the process of transfer of pollen grain to the stigma. This transfer further facilitates fusion of the gametes in the emryo sac.
Answer: Option A. -> True
:
A
In many plants, the normal process of sexual reproduction is substituted by an asexual process and as a result seeds are produced without the need for fertilization. This phenomenon of substitution of the usual sexual process by asexual methods is known as apomixis and plants which exhibit this condition are called apomictic plants.
:
A
In many plants, the normal process of sexual reproduction is substituted by an asexual process and as a result seeds are produced without the need for fertilization. This phenomenon of substitution of the usual sexual process by asexual methods is known as apomixis and plants which exhibit this condition are called apomictic plants.
Answer: Option A. -> When pollen is shed at two-celled stage, double fertilization does not take place
:
A
In 60% of flowering plants, the pollen grains are shed at two–celled stage (tube cell + generative cell). Further, development of male gametophyte (pollen grain) occurs on stigma. Pollen grain gives rise to pollen tube which absorbs nourishment from the cells of style for its growth. Generative cell divides to give rise to two male gametes. Out of these, one fuses with the egg to form diploid zygote (generative fertilization or syngamy) whereas the second male gamete fuses with the two haploid polar nuclei or diploid secondary nucleus of the central cell to form primary endosperm nucleus (vegetative fertilization or triple fusion). These two acts of fertilization occur in the same embryo sac and are referred to as double fertilization.
:
A
In 60% of flowering plants, the pollen grains are shed at two–celled stage (tube cell + generative cell). Further, development of male gametophyte (pollen grain) occurs on stigma. Pollen grain gives rise to pollen tube which absorbs nourishment from the cells of style for its growth. Generative cell divides to give rise to two male gametes. Out of these, one fuses with the egg to form diploid zygote (generative fertilization or syngamy) whereas the second male gamete fuses with the two haploid polar nuclei or diploid secondary nucleus of the central cell to form primary endosperm nucleus (vegetative fertilization or triple fusion). These two acts of fertilization occur in the same embryo sac and are referred to as double fertilization.
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