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51.

What is budding also called in yeast?(a) Archaeocytes(b) Vegetative propagation(c) Torulation(d) FragmentationThis question was posed to me in exam.The origin of the question is Organisms in portion Reproduction in Organisms of Biology – Class 12

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Correct choice is (c) Torulation

To elaborate: BUDDING is the process of formation of small MINI structures similar to the parent that grow to an extent and then FALLS off to grow INDEPENDENTLY. It is ALSO called torulation in yeast as a parent cell. Buds bearing buds resemble a fungi genus Torula.
Discussion
52.

Amoeba undergoes sporulation.(a) False(b) TrueI had been asked this question in class test.This interesting question is from Organisms in chapter Reproduction in Organisms of Biology – Class 12

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The CORRECT choice is (B) True

The explanation: Sporulation is the phenomenon of encysted AMOEBA UNDERGOING multiple fission to produce pseudopodiospores that are scattered into the environment to grow INDEPENDENTLY.
Discussion
53.

Which organism undergoes the phenomenon of encystation?(a) Plants(b) Amoeba(c) Ring worm(d) FungiI have been asked this question by my college professor while I was bunking the class.The doubt is from Organisms in section Reproduction in Organisms of Biology – Class 12

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The correct choice is (b) Amoeba

The EXPLANATION is: Amoeba undergoes the phenomenon of ENCYSTATION. Under UNFAVORABLE CONDITIONS, amoeba WITHDRAWS its pseudopodium and secretes a cyst that covers it.
Discussion
54.

How does hydra reproduce?(a) Gemmules(b) Budding(c) Conidia(d) ZoosporesI have been asked this question in a national level competition.I need to ask this question from Organisms in division Reproduction in Organisms of Biology – Class 12

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The correct answer is (a) Gemmules

To explain I WOULD say: Hydra reproduces by forming buds externally. It grows and develops tentacles. It EVENTUALLY separates from the parent and LIVES an independent life. This process may also be known as fragmentation in hydra since a part of it falls of and starts growing INDEPENDENTLY.
Discussion
55.

Which of the following undergoes binary fission?(a) Amoeba(b) Hydra(c) Yeast(d) Ring wormI got this question in exam.My doubt stems from Organisms topic in division Reproduction in Organisms of Biology – Class 12

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Right choice is (a) Amoeba

Explanation: Amoeba undergoes binary fission. Many SINGLE CELLED organisms UNDERGO binary fission. The diagram DEPICTS the process.
Discussion
56.

What is the period of growth known as in plants?(a) Senescence(b) Juvenile phase(c) Reproductive phase(d) Vegetative phaseI have been asked this question in class test.My enquiry is from Reproduction in Organisms topic in chapter Reproduction in Organisms of Biology – Class 12

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The correct answer is (d) Vegetative phase

Explanation: The GENERAL term for the period of growth is known as juvenile phase. In PLANTS it is known as the vegetative phase. The END of juvenile phase marks the BEGINNING of reproductive phase.
Discussion
57.

Fusion of gametes forms a zygote.(a) False(b) TrueThis question was posed to me during an online exam.This question is from Reproduction in Organisms in portion Reproduction in Organisms of Biology – Class 12

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Right choice is (b) True

The explanation: The process of fertilization is described as the fusion of two gametes of opposite SEX. This fusion forms a zygote or an EGG. Its genome is a COMBINATION of DNA in 2 gametes. Th chromosome number in each is 23 (haploid). On fusion it becomes a diploid CELL (23 + 23 = 46).
Discussion
58.

How does Bryophyllum reproduce?(a) Leaves(b) Stem(c) Roots(d) NodesThe question was posed to me by my college director while I was bunking the class.My question is based upon Reproduction in Organisms in section Reproduction in Organisms of Biology – Class 12

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Correct option is (a) Leaves

Explanation: Adventitious buds ARISE from the margin of the leaves in Bryophyllum. Those buds give rise to new PLANTS that FALL of when they are CAPABLE enough to grow on their own. This unique ABILITY has been exploited by the gardeners and farmers.
Discussion
59.

Sexual reproduction is better than asexual reproduction.(a) False(b) TrueThe question was asked in examination.Query is from Reproduction in Organisms in chapter Reproduction in Organisms of Biology – Class 12

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The correct choice is (b) True

To explain I would say: Sexual reproduction is BETTER than asexual reproduction. This is MOSTLY because sexual reproduction brings about variation in the OFFSPRING which brings about mutations and helps it adapt to the changes in the environment. On the other hand, asexual reproduction is a fast process but the offspring that is produced has no variation which MAKES it difficult for it to adapt to EVEN small changes.
Discussion
60.

From where do rhizomes arise?(a) Roots(b) Leaves(c) Buds(d) NodesI have been asked this question during an interview for a job.Asked question is from Reproduction in Organisms in chapter Reproduction in Organisms of Biology – Class 12

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Correct answer is (d) NODES

Explanation: The site of ORIGIN in rhizomes is from nodes present in modified stems. EXAMPLES of plants that give rise to new plantlets from nodes: potatoes (the nodes on potatoes are also CALLED nodes) and ginger.
Discussion
61.

Which plant is the “terror of Bengal”?(a) Cereus(b) Corpse plant(c) Water hyacinth(d) CactusI have been asked this question in class test.My question comes from Reproduction in Organisms topic in chapter Reproduction in Organisms of Biology – Class 12

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The correct choice is (c) WATER hyacinth

The best I can explain: Water hyacinth is a water weed that grows on STILL water. It drains out all the OXYGEN from the water bodies which is extremely fatal for the marine organisms. It is very difficult to get rid of them because even if leaves BEHIND a single bud, it will start multiplying at a great speed.
Discussion
62.

What is the term used to describe genetic and morphologic similarities between different individuals?(a) Offspring(b) Clone(c) Gamete(d) CellI had been asked this question during an interview.My question is taken from Reproduction in Organisms in portion Reproduction in Organisms of Biology – Class 12

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Right CHOICE is (b) Clone

Easy explanation: Clones are organisms with the same genetic and morphological similarities. It can be carried out naturally and artificially. Asexual REPRODUCTION is an example of natural cloning. ARTIFICIAL cloning is carried out in labs. In biotechnology cloning can refer to DNA FRAGMENTS or cell copies.
Discussion
63.

Reproduction is defined as a biological process of organisms giving rise to young ones or offspring.(a) True(b) FalseI had been asked this question in an interview.My question is from Reproduction in Organisms topic in chapter Reproduction in Organisms of Biology – Class 12

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Right CHOICE is (a) True

Easiest explanation: Reproduction is a biological process CARRIED out by organisms in order to KEEP their species alive. It is a process carried out generation after generation. There are MANY ways of reproducing. They are DIVIDED into sexual and asexual reproduction.
Discussion
64.

What is the period from birth to natural death of an organism known as?(a) Life span(b) Senescence(c) Age(d) Life cycleI got this question during an internship interview.Origin of the question is Reproduction in Organisms topic in section Reproduction in Organisms of Biology – Class 12

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The CORRECT choice is (a) Life span

To explain: The period from birth to natural DEATH of an organism is known as its life span. It varies from few YEARS to thousand years, depending on the organism.
Discussion