3341: The release of which one of the following into ponds and wells helps in controlling the mosquitoes?
(a) Gambusia fish
(b) Snail
(c) Crab
(d) Dogfish
3342: The easiest way of finding out the nutritional status for large number of children in a short time is by:
(a) Studying their behaviour
(b) Studying their hair, face and eyes
(c) Measuring their height and weight
(d) All of the above
3343: Consider the following statements:
1. The Nuclear Suppliers Group has 24 countries as its members.
2. India is a member of the Nuclear Suppliers Group.
Which of the statements given above is/are correct ?
(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2
3344: Which one of the following is the correct sequence of a food chain?
(a) Diatoms-Crustaceans-Herrings.
(b) Crustaceans-Diatoms-Herrings.
(c) Diatoms-Herrings-Crustaceans.
(d) Crustaceans-Herrings-Diatoms.
3345: Mark the correct answer:
(a) Planets have an apparent motion and twinkle
(b) Planets have no apparent motion but twinkle
(c) Planets have an apparent motion but do not twinkle
(d) Planets have no apparent motion and do not twinkle