Question: Which of the following can spread AIDS?
A.Mosquito bites
B.Transfusion of infected blood
C.Hugging an infected person
D.Eating food with infected person
Answer: Option B
: B

AIDS is caused by HIV virus. It can spread through various means like:
i. Sexual contact with an infected person.
ii. Transfusion of contaminated blood.
iii. From a pregnant mother to her child during birth or breastfeeding.

It does not spread by:
i. Touching, kissing and socialising with the infected person.
ii. Eating meals with an infected person.
iii. Mosquito bites.

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More Questions on This Topic :

Question 1. Sex of a foetus depends on
  1.    Amount of regulatory hormone from pituitary
  2.    Amount of sex hormone
  3.    Type of ovum
  4.    Type of sperm
Answer: Option D
: D

The sex of a foetus depends on thetype of sperm that meets the egg. A sperm carries either a Y chromosomeor an Xchromosome. Since women carry XX chromosomes, all egg cells (female gametes) formed will be X.If a sperm containing Y chromosomefertilises the egg, offspring will be male, whereas if an X chromosome containing sperm fertilises an egg, the embryo will be female.
Question 2. During puberty, testis secretes testosterone.
  1.    True
  2.    False
  3.    medulla oblongata
  4.    hypothalamus
Answer: Option A
: A

The testis is the main functional part of the male reproductive system. Some specialised cells of the testis secrete the male hormone, testosterone during puberty. Testosterone is responsible for theformation of spermas well as secondary sexual characteristics in males.
Question 3. How many autosomes and allosomes are present in human beings?
  1.    (21+2) pairs
  2.    (22+1) pairs
  3.    (19+4) pairs
  4.    (2+21) pairs
Answer: Option B
: B

  • There are 22 pairs of autosomes and one pair of allosomes (also called sex chromosomes), thus a total of 23 pairs ofchromosomes.
  • In human karyotype, the autosome pairs are labelled with numbers, while thesex chromosomes are labelled withletters. Females (44+XX) havetwo X chromosomes while males (44+XY) containone X and one Y chromosome.
Question 4. The reproductive phase of a woman lies between her _____ and menopause.
  1.    menstruation
  2.    menarche
  3.    ovulation
  4.    menstrual cycle
Answer: Option B
: B

The reproductive phase of a woman starts from her first period(menarche) at around 10-12 years of age. It continues until the age of 45 to 50, when women stop releasing eggs. This is called menopause. Hence, thereproductive phase of women lies between their menarche and menopause.

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