MEDIUM
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Study the given figure of the reproductive system of male cockroach.
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In which of the labelled parts are the sperms stored?

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Important Questions on Structural Organisation in Animals

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In cockroach, the ootheca is formed by the secretion of-
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About how many times does the nymph of the Periplaneta americana undergo moulting before becoming an adult?
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Consider the following four statements (i)-(iv) and select the correct option stating which ones are true (T) and which ones are false (F) .
(i) In male cockroach, genital pouch or chamber lies at the hind end of abdomen bounded dorsally by 9th and 10th terga and ventrally by the 9th sternum.
(ii) In cockroaches, the haemolymph is composed of colourless plasma and haemocytes.
(iii) In a female cockroach each ovary is formed of a group of ten ovarian tubules or ovarioles, containing a chain of developing ova.
(iv) In cockroach the nymph grows by moulting about 13 times to reach the adult form.
  A B C D
(i) F T F T
(ii) F F T T
(iii) T T F T
(iv) T F T F
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Which of the following statements is incorrect about the frog?
(i) Eyes are bulged out and covered by a nictitating membrane that protects them while in water.
(ii) On either side of the eyes a membranous tympanum (ear) receives sound signals.
(iii) The hind limbs end in four digits and they are larger and muscular than fore limbs that end in five digits.
(iv) Feet have webbed digits that help in swimming.
(v) Frogs exhibit sexual dimorphism.
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The figure given here shows diagrammatic representation of internal organs of frog.
Identify A to E and select the correct option.
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In a frog, if a hole is punched in the floor of its buccal cavity, then the frog will not die as
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Read the following statements (P-T) and select the option that correctly fills (i)-(v) .
P. The male frog has a special organ on the throat called __ (i) __.
Q. __ (ii) __ membrane is a part of the ear and serves to receive sound waves.
R. Dermis of the frog contains sac-like __ (iii) __ glands.
S. The tongue of a frog is __ (iv) __.
T. __ (v) __ respiration takes place in the lungs on land.