Biology : Reproduction in Organisms

Select the correct statement regarding reproduction

• Mating in dogs is synchronised with lunar cycle.

• Salamanders always have internal fertilisation.

• In Trygon, the male introduces sperms into female through a modified pelvic fin.

• Catla has internal fertilisation

Which form of reproduction is correctly matched?

• Euglena $\to$transverse binary fission

• Paramecium $\to$longitudinal binary fission

• Amoeba $\to$multiple fission

• Plasmodium $\to$binary fission

Assertion: Many plants are propagated vegetatively even though they bear seeds.

Reason: Potatoes multiply by tubers and apple by cutting.

• If both assertion and reason are true and reason is the correct explanation of assertion

• If both assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false

• If both assertion and reason are false.

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