Test 19: XIIth-18 ChaptersContact Number: 9667591930 / 8527521718Test 19: XIIth-18 ChaptersContact Number: 9667591930 / 8527521718The free-living fungus Trichoderma can be used for:
1. killing insects
2. biological control of plant diseases
3. controlling butterfly caterpillars
4. producing antibiotics
While heat gain or heat loss is the function of ______, heat production is the function of ________ of the body of an animal.
1. Volume; Surface area
2. Surface area; Volume
3. Volume; Volume
4. Surface area; Surface area
The main difference between "Sixth Extinction" and the previous five extinctions is that the sixth extinction:
1. is mainly occurring on islands
2. is mainly affecting plants
3. is occurring at a faster rate
4. does not involve human activities
Which of the following is not due to the total internal reflection of light
1. Brilliance of the diamond
2. Mirage on hot summer days
3. Working of optical fiber
4. Difference between real and apparent depth of a pound
The half-life of a radioactivity isotope X is 100years. It decays to an element Y which is stable. The two elements are found to be ratio 1: 32 in a sample of a given rock. Assuming that at the time of formation of the rock there was only isotope X, then estimate the age of the rock.
1. 300 years
2. 400 years
3. 500 years
4. 600 years