Extensive planting of trees to increase forest cover is called
(a) Social forestry
(b) deforestation
(c) Agro forestry
(d) Afforestation
Answer:
Fertilizer can be washed into rivers by the rain. This can cause
(a) Purification
(b) Biodegradation
(c) Bioaccumulation
(d) Eutrophication
Answer:
Chronic exposure of plants to sulphur dioxide leads to chlorosis, which is
(a) Retarded growth
(b) Bleaching of green leaves
(c) Blackening of buds
(d) Burning of roots
Answer:
Groundwater mining in coastal areas can result in
(a) Increase in the water table.
(b) Decrease in the salinity of ground water.
(c) Decrease in the toxicity of ground water.
(d) Increase in the salinity of groundwater.
Answer:
Gamma radiation are used for
1. Pest control
2. Sterilization of food stuffs
3. Cancer therapy surgical
4. Sterilization of instrument in hospital
Choose the correct codes-
(a) Both 1 and 3
(b) 1, 2 and 3
(c) 1, 2 and 4
(d) All of them.
Answer:
Plants take carbon dioxide from atmosphere mainly through their
(a) Leaves
(b) Roots
(c) Stem
(d) Flowers
Answer:
Organic substances which, in very small amounts, control growth and development called
(a) Hormones
(b) Enzymes
(c) Vitamins
(d) None of these
Answer:
Which of the following is/are NOT a fundamental duty?
(a) To protect and improve the natural environment.
(b) To protect monuments and places of national importance.
(c) To respect the National Anthem.
(d) To safeguard public property.
Answer:
Which of the following statements is NOT correct in the context of the Revolt of 1857?
(a) It could not influence the whole of India.
(b) The Zamindars of Bengal remained loyal to the British.
(c) A majority of educated Indian did not support it.
(d) Majority of the Indian rulers participated in it.
Answer:
Assertion (A): Snake was worshiped by the Indus valley people.
Reason (R): A clay amulet found from the Indus site depicts a snake before a stool on which is kept some offering, probably milk.
(a) A and R are true and R is the correct explanation of A.
(b) A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Answer: