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Reproduction in Organisms

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Biology

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Biology

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12

What will you look for to identify the sex of the following?

  • male frog - a copulatory pad on the first digit of the hind limb

  • Female cock - anal cerci

  • Male shark - claspers borne on pelvic fins

  • Female Ascaris - sharply curved posterior end


C.

Male shark - claspers borne on pelvic fins

A clasper is a male anatomical structure found in some groups of animals, and used in mating. Male cartilaginous fish like shark hacve claspers formed from the posterior portion of their pelvic fin which serves as intromittent organs used to channel semane into the female's cloaca during mating.

A clasper is a male anatomical structure found in some groups of animals, and used in mating. Male cartilaginous fish like shark hacve claspers formed from the posterior portion of their pelvic fin which serves as intromittent organs used to channel semane into the female's cloaca during mating.

448 Views

Micropropagation is based on :
  • (A) tissue culture
  • (B) hybridization
  • (C) microtomy
  • (D) genetic control.

A.

(A) tissue culture
918 Views

Bryophyllum is vegetatively propagated by :
  • (A) Bulbil 
  • (B) Leaf buds
  • (C) rhizome
  • (D) Offset.

B.

(B) Leaf buds
854 Views

Vegetative type of reproduction means :
  • (A) plant portion is used as a means of propagation
  • (B) seed is used as a means of propagation
  • (C) flower is used as a means of propagation
  • (D) None of the above.

A.

(A) plant portion is used as a means of propagation
958 Views

The entry of pollen tube into embryo sac through the integuments is termed as :
  • (A) porogamy
  • (B) chalazogamy
  • (C) mesogamy
  • (D) Both (a) and (b)

C.

(C) mesogamy
1067 Views

Testa and tegmen are present in :
  • (A) flower
  • (B) ovary
  • (C) seed
  • (D) seed coat.

D.

(D) seed coat.
2138 Views