Question

32 approximately what percent of the sunlight striking the earth is actually reflected back into space on any given day?

33 In the evolutionary sense, a measure of an individual organism's relative fitness is a measure of its_________

34 The light Dependent step in photosynthesis is also known as the Krebs Cycle (T / F)

Answer 1

32)

• Nearly 30%

                             Essentially 100% of the energy that fuels the earth comes from sun. To maintain a constant global average temperature, all of the sun's radiation that enters Earth's atmosphere must eventually be sent back to space. This is achieved through Earth's energy balance.

            

            100% of the energy entering earth's atmosphere comes from the sun.

• 50% of the incoming energy is absorbed by the Earth's surface ; the land and oceans.
• 30% is directly reflected back to space by clouds, the earth's surface and different gases and particles in the atmosphere.
• 20% is absorbed by the atmosphere and clouds.

33)

• Reproductive success and survival

                           The best measure of an organisms fitness would be the number of fertile offspring is it's production and it's survival. Fitness is the measure of reproductive success which would result in more offspring which would contributor more to the gene pool of the next generation. This term is typically used in subjects such as evolutionary biology.

                 

34)

• False

                        The light-dependent step in photosynthesis is also known as Calvin cycle. The Calvin cycle of photosynthesis reactions that convert carbon dioxide and other compounds into glucose. These reactions occur in the stroma, the fluid filled area of a chloroplast outside the thylakoid membranes. These reactions take the products (ATP and NADPH) of the light-dependent reactions and perform further chemical processes on them.

                       Kreb's cycle is a series of chemical reactions used by all aerobic organisms to release stored energy through the oxidation of acetyl-CoA into Adenosine Triphosphate (ATP) and carbon dioxide. Kreb's cycle is a part of cellular respiration not a part of photosynthesis.