Question : The body of the ______ is circular in cross-section; hence, the name roundworms. They may be free-living, aquatic, terrestrial, or parasitic on plants and animals.

Option 1: Platyhelminthes

Option 2: Ctenophores

Option 3: Mollusca

Option 4: Aschelminthes

Question : Diamonds are priced higher than water because :

Option 1: They are sold by selected firms with monopolistic powers.

Option 2: Their marginal utility to buyers is higher than that of water .

Option 3: Their total utility to buyers is higher than that of water.

Option 4: Consumers do not by them at lower prices .

Question : Which of the following is correct about cold blooded animals?

Option 1: Their blood remains cold all the time

Option 2: Their body temperature changes in accordance with the atmosphere

Option 3: Their body temperature remains constant all the time

Option 4: They kill all the animals they come across

Question : Warming Ammonium chloride with sodium hydrochloride in a test tube is an example of

Option 1: Open system

Option 2: Closed system

Option 3: Isobaric system

Option 4: Isothermal system

Question : Which of the following animals have a single opening in their digestive system that serves both as a mouth and an anus?

Option 1: Arachnids

Option 2: Echinoderms

Option 3: Platyhelminthes

Option 4: Arthropods