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 Multiple Choice QuestionsMultiple Choice Questions

21.

Noncleidoic eggs occur in

  • birds

  • fish

  • reptiles

  • platypus


22.

Division in a bacterial cell is carried out through

  • multiple fission

  • binary fission

  • budding

  • plasmotomy


23.

Which of the following two hormones are essential for induced breeding of fishes?

  • TSH and ACTH

  • Oestrogen and progesterone

  • FSH and LH

  • Vasopressin and oxytocin


24.

One micrometer is equal to

  • 0.0001 mm

  • 0.001 mm

  • 0.01 mm

  • 0.00001 mm


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25.

Product of sexual reproduction generally generates

  • longer viability of seeds

  • prolonged dormancy

  • new genetic combination leading to variation

  • large biomass


26.

Which of the following processes was discovered by Lederberg and Tatum (1946)?

  • Transduction

  • Transformation

  • Asexual reproduction

  • Conjugation


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27.

The component of bacteria that retains the crystal violet stain during Gram staining is

  • O- antigen

  • lipopolysaccharide

  • peptidoglycan

  • cytoplasmic membrane


C.

peptidoglycan

Gram staining is the method of differentiating bacterial species into two large groups, i.e., Gram positive and Gram negative bacteria based on the physical properties of their cell walls.

In the process of Gram staining 

- alcohol is used for decolourlisation process. It solubilises lipid but does not solubilise peptidoglycan layer.

As Gram positive bacteria has less lipid percentage as compared to peptidoglycan. Thus, peptidoglycan which does not get solubilised retain the Gram stain and Gram negative bacteria which has thinner peptidoglycan layer cannot retain the Gram stain.


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28.

Neoteny refers to

  • development of gonads

  • moulting

  • metamorphosis

  • retention of larval traits in the adult body


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29.

Select the correct statements from the following regarding asexual reproduction.

I. It is slower than sexual reproduction.

II. It involve a single parent.

III. It produces progeny that are genetically identical with the parent.

IV. Clones are the progeny of asexual reproduction

  • I, II, III, IV

  • I, II, IV

  • I, II, III

  • II, III, IV


30.

Multiplication of genetically identical copies of a cultiver by asexual reproduction is known as

  • aclonal propagation

  • clonal propagation

  • vegetative propagation

  • polyclonal propagation


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