Concepts in Environmental Sciences and Ecosystems

Which of the bio-geochemical cycles is represented in the figure above?

• Nitrogen cycle

• Carbon cycle

• Hydrologic cycle

• Sulfur cycle

Which of the following is an example of anthropogenic source of carbon dioxide (i.e., CO2)?

• Burning of fossil fuels

• Volcanic eruptions

• Decomposition of organic wastes

• Animal Respiration

A process by which food is made by bacteria or other living things using chemicals as the energy source, typically in the absence of sunlight is known as:

• Photosynthesis

• Chemosynthesis

• Infiltration

• Condensation

If the amount of energy available in fourth trophic level is 6.384 kJ, then what is the amount of energy is lost as heat from second trophic level?

• 638.4 kJ

• 574.6 kJ

• 36.84 kJ

• 57.46 kJ

An example of autotroph in terrestrial ecosystem is

• Algae

• Phytoplankton

• Green plants

• Seaweed

Which of the following is correct about the food web shown above?

• Jackal, wild cat and kite are in fourth trophic level

• Goat, rabbit and owl are primary consumers

• Snake, mouse and goat are herbivores

• Green plant, rabbit and owl are heterotrophs

Environmental science is the study of how

• living organisms interact with each other

• living organisms interact with each other and with the physical environment

• human is affecting the environment and find solutions for the environmental problems

• human population interact with each other.

In addressing environmental problems, the next step after public involvement is

• Scientific assessment

• Risk analysis

• Political action

• Long-term evaluation

"When the surface temperature rises, part of the ice and snow melts, leading to an increase in the solar radiation absorbed by the surface and to an enhanced surface warming". This is an example of

• Positive feedback system

• Negative feedback system