How do Organisms Reproduce? — Questions & Answers

Sample questions from How do Organisms Reproduce?

1. Q1. Why do testes lie outside the abdominal cavity?

   • A.Sperm formation requires a temperature slightly lower than body temperature✓
   • B.They must receive sunlight
   • C.They produce urine there
   • D.They cannot contain blood
   Solution

   A lower temperature is favourable for sperm production.

2. Q2. A surgical method in which the sperm ducts are cut or tied is:

   • A.vasectomy✓
   • B.tubectomy
   • C.IUD
   • D.condom use
   Solution

   Vasectomy blocks the vas deferens in males.

3. Q3. Oral contraceptive pills work by:

   • A.Changing the hormonal balance so that eggs are not released✓
   • B.Killing the sperms
   • C.Blocking the vas deferens
   • D.Preventing the entry of sperms
   Solution

   A is correct: the pills alter the hormonal balance of the body so that no egg is released, and since they interfere with hormones they may have side effects. B is not their mode of action. C is surgery. D is the barrier method.

4. Q4. The function of the testes is to produce:

   • A.Only testosterone
   • B.Sperms and the hormone testosterone✓
   • C.Only sperms
   • D.The ovum
   Solution

   B is correct: the testes have two functions, producing the male germ cells and secreting the hormone that brings about the male secondary sexual characters. A and C each take one of the two. D is produced by the ovary.

5. Q5. Which pair of sexually transmitted diseases is caused by bacteria?

   • A.HIV-AIDS and warts
   • B.Gonorrhoea and syphilis✓
   • C.Warts and syphilis
   • D.HIV-AIDS and gonorrhoea
   Solution

   Gonorrhoea and syphilis are bacterial infections, whereas warts and HIV-AIDS are caused by viruses.

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