Mr Khanna had a pond in his garden, filled with all kinds of aquatic plants. He wanted to prevent mosquitoes from breeding in the pond without harming the plants in any way. He could __________.
(i) Add salt into the water
(ii) Add some goldfish into the pond
(iii) Spray a film of oil on the surface of the pond
A (i) only
B (ii) only
C (iii) only
D (i), (ii) and (iii)
B is correct. As goldfish eat the mosquitoe's eegs
While building a new house, which of the following things should be taken care of to keep house clean and free of germs?
AThere should be proper ventilation, so that clean air can enter the house.
BThere should be good drainage system in bathrooms and kitchen.
CWindows and doors should have wire mesh to avoid flies and mosquitoes from entering into house.
DAll of these
Read the given statements and select the correct option.
Statement 1 :Mammals are warm-blooded animals.
Statement 2 :Mammals maintain constant body temperature despite changes in environmental temperature.
ABoth statements 1 and 2 are true and statement 2 is the correct explanation of statement1.
BBoth statements 1 and 2 are true but statement 2 is not the correct explanation of statement1.
CStatement 1 is true but statement 2 is false.
DBoth statements 1 and 2 are false.
Select an INCORRECT statement regarding photosynthesis.
AFood is prepared by green leaves of a plant.
BWater required for making food is absorbed by roots.
CFor photosynthesis, oxygen is taken in through stomata
DSunlight required for photosynthesis is absorbed by chlorophyll.