Question

Identify any unique characteristics of the Trophosphere:

Select one or more:

a. clouds, rain, winds and storms all occur in this sphere

b. comprised of mostly water vapor

c. is the weather and climate zone

d. greenhouse effect caused by heat trapping gases present in small concentrations

e. nitrogen and oxygen gasses are in the highest concentrations

f. ozone layer exists here

In the Nitrogen cycle, which organisms specifically fix nitrogen gas (N2) from the atmosphere?

Select one:

a. bacteria in the root nodules of legume plants

b. decomposers

c. soil bacteria

d. A and C

e. B and C

Refer to the following equation:   Sugar (Glucose) + O2 + H20 --> CO2 + H2O + ATP

Select one:

a. this represents photosynthesis

b. this represents cellular respiration

c. organisms use to produce energy molecules necessary for metabolic reactions

d. A and C

e. B and C

Answer 1

Ans.1 Atmosphere on earth has following layers from the surface of the earth: troposphere, stratosphere, mesosphere, thermosphere and exosphere.

Troposphere is the first layer of atmosphere just above the surface of the earth and it range up to the height of 6-10 Km from sea level. In this layer turbulence in weather, cloud formation, rain etc. occurs. Ozone layer is formed in stratosphere.

Thus the first option: (a) is correct.

Ans. 2. Conversion of atmospheric N2 into ammonia is called nitrogen fixation. Biological nitrogen fixation is carried out by the both symbiotic bacteria like rhizobium present in the root nodules of legume plants and free soil bacteria like azatobacter.

So, the correct option is (d): A and C.

Ans. 3. Aerobic cellular respiration is the bioprocess in which glucose is oxidized in presence of oxygen and chemical energy in from of ATP is produced. This energy in from of ATP is further used by the organisms to carry out other metabolic processes.

Hence, option (e): B and C are right.