21.

Noncleidoic eggs occur in

• birds

• fish

• reptiles

• platypus

Division in a bacterial cell is carried out through

• multiple fission

• binary fission

• budding

• plasmotomy

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

One micrometer is equal to

• 0.0001 mm

• 0.001 mm

• 0.01 mm

• 0.00001 mm

Product of sexual reproduction generally generates

• longer viability of seeds

• prolonged dormancy

• new genetic combination leading to variation

• large biomass

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

• Transduction

• Transformation

• Asexual reproduction

• Conjugation

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

• O- antigen

• lipopolysaccharide

• peptidoglycan

• cytoplasmic membrane

Neoteny refers to

• development of gonads

• moulting

• metamorphosis

• retention of larval traits in the adult body

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

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

• aclonal propagation

• clonal propagation

• vegetative propagation

• polyclonal propagation