Class 12th Biology – 1 Reproduction in Organisms MCQs
A root is adventitious when it is
A root is adventitious when it is formed from plumule. Root growing in an unusual location e.g. from a stem. Root is usually underground organ that lacks buds or leaves or nodes; absorbs water and mineral salts; usually it anchors the plant to the ground.
During asexual reproduction the parent contributes
Asexual reproduction involves mitosis which is a duplication division of the chromatin material. Thus parent will contribute all the chromatin material to the offspring.
Syngamy means
Syngamy is fusion of one of the two male gametes with egg to produce diploid zygote (oospore)
Natural clones in plants are produced by
Grafting, Layering are artificial vegetative propagation, seeds are products of sexual reproduction. Bulbils are natural vegetative propagules.
Exponential growth of cells is a characteristic feature of
Embryo growth graph is 'J' shaped.
The 'Eyes' of the potato tuber are
The axillary buds of the potato tuber are called 'eyes' in common language. They are found at the nodes of the stem tuber.
Common method of asexual reproduction is by
Most common forms of asexual reproduction in animals are fission and budding.
The process that develops a zygote is ____.
Syngamy is the union of the nuclei of the gametes involved in sexual reproduction. Apogamy is development of a sporophyte from a gametophyte without fertilisation. Oogamy refers to the type of gametes produced in which the male is smaller and motile and the female is static. Plasmogamy defines the union of only protoplasm which is commonly found in the group Fungi during sexual reproduction.
A sperm without acrosome, cannot
Acrosome contains an enzyme hyaluronidase which breaks the covering of the ovum.
Which type of reproduction is found in Hydra?
Both sexual and asexual type of reproduction are found in Hydra.
Cockroach shows sexual dimorphism and the male cockroach is identified by the presence of
"Anal style" is found in male cockroach. It is used for copulation. The antennae, compound eyes and anal cerci are common to male and female cockroach.
Among the following which one is not a method of vegetative propagation?
Sowing is related with sexual reproduction.
Fertilization of egg takes place inside
Because egg is the part of embryo sac.
In land plants pollen contains _________________.
In land plants pollen grains contain two male gametes that are non-motile and lead to double fetilisation. Sperm is the term normally referred to male gametes in animals. Antherozoid is the term for motile male gametes in lower plants like bryophytes and pteridophytes.
The only vegetative propagation that can develop variations in the offspring is____.
Grafting involves two individuals, the stock and the scion. The offspring may develop a combination of parental characters. All other options involve only one parent.
Which one of the following is correctly matched?
Onion- Bulb- Underground stem, Ginger-Rhizome, Chlamydomonas- Zoospores, Yeast- ascospores.
External fertilisation is very commonly found in
Aquatic organisms exhibiting external fertilisation produce large number of gametes into the surrounding medium water and this ensures syngamy.
What is true for cleavage?
Cleavage involves repeated cell division without a concomitant increase in total cell volume, that is average diameter of the cell decreases.
Stem cuttings are commonly used for the propagation of
Stem cutting of at least one year old stem are employed in case of rose for propagation.
Which of the following represent post-fertilisation changes?
The duration of a one-celled zygote developing into an embryo mitotically as in diploids or developing into spores by meiosis in haploids is Post-fertilisation changes.
The main difference between animal and plant cell is that
In animal cell only the cell membrane is its outer covering. Cell wall is absent.
Find out the wrongly matched pair.
Banana is vegetatively propagated by modified stem (Rhizomes).
The ovules are completely enclosed by sporophytic tissues in
In Angiosperms the plant is a sporophyte and the gametophytes develop inside the flower. The female gametophyte is the ovule that is surrounded by the sporophytic tissues. The ovule becomes the seed after fertilisation and is well protected by the seed coat unlike in B, C or D.
One of the plants using 'Foliar adventitious buds' is a method for vegetative propagation is
Foliar (on the leaf) adventitious buds are formed at place other than nodes. E.g., Bryophyllum.
Strobilanthes kunthiana is a plant known for its unique feature namely
The plant flowers once in twelve years.
Development of an egg without fertilization is called
Development of an egg (ovum) into complete individual without fertilization by a sperm is known as parthenogenesis.
The number of seeds in a plant is determined by the number of
The ovules contain the female gametophyte developing the female gamete. This female gamete fuses with a male gamete and becomes a seed enclosing the zygote, the first cell of the next generation.
Clones are groups of organisms that are similar in their
Clones are morphologically and genetically identical.
What is common between vegetative reproduction and apomixis?
Vegetative reproduction and apomixis both are asexual methods of reproduction, which give the progency genetically similar to parents.
A modification of bud that can bear leaves, flowers, fruits and branches is
A modification of bud that can bear leaves, flowers, fruits and branches is thorn. Thorn, a sharp structure in plants.
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