71.

Increase in toxic concentration from one trophic level to another trophic level is called

• ecological toxification

• bio- magnification

• bioconcentration

• cytological effect

Which of the following workers are related as ecologist, palaeobotanist and embryologist respectively?

• B. Salmi, R. Mishra, P. Maheshwari

• R Mishra, B. Sahni, P. Maheshwari

• B. Sahni, P. Maheshwari, R Mishra

• P. Maheshwari, R Mishra, B. Sahni

In terrestrial ecosystem such as forest, maximum energy is found in which trophic level

• T₁

• T₂

• T₃

• T₄

The part of earth in which life exist is known as

• Lithosphere

• Biosphere

• Atmosphere

• Hydrosphere

The water logging capacity of garden soil will be determined by measuring the weight of

• soil by adding water and humus

• water saturated soil then heating the soil till it is dry and then measuring the weight of soil

• soil by adding water, biomass and humus

• soil from different locations with biomass.

Enzyme and carbohydrates dominate in the digestive tract of

• carnivores

• omnivores

• parasites

• herbivores

When a natural predator (living being) is applied on the other pathogen organism to control them, this process is called

• biological control

• genetic engineering

• artificial control

• confusion technique

The 10% energy transfer law of food chain was given by

• Stanley

• Weismann

• Lindemann

• Tansley

Match column I with column II and select the correct option from the codes given below.

Column I	Column II
A. Commensalism	(i) One inhibited, other unaffected
B. Parasitism	(ii) One benefitted, other unaffected
C. Mutualism	(iii) Both are benefitted
D. Amensalism	(iv) One benefitted, other harmed

• A - (iv), B - (ii), C- (iii), D - (i)

• A - (iii), B - (iv), C - (ii), D - (i)

• A - (ii), B - (iv), C - (iii), D - (i)

• A - (ii), B - (iv), C - (i), D - (iii)

Which of the following is used as bioinsecticide?

• Bacillus polymyxa

• Cylindrospermum licheniforme

• Phytophthora palmivora

• Chrysanthemum cinerarifolium