Photosynthesis Photosynthetic Organisms 4

Question 1

Halobacteria (extreme halophiles) perform a unique form of photosynthesis using which protein instead of chlorophyll?

Accepted Answer

Bacteriorhodopsin

Answer

Bacteriorhodopsin is a light-driven proton pump in halobacteria that generates ATP without using chlorophyll or producing oxygen.

Question 2

Which aquatic plant is NOT a true plant but rather a macroalgae often confused with plants?

Accepted Answer

Sea lettuce (Ulva)

Answer

Ulva (sea lettuce) is a green macroalga, not a true plant, lacking roots, vascular tissue, and embryo development.

Question 3

Nitrogen-fixing cyanobacteria in rice paddies are ecologically important because they:

Accepted Answer

Convert atmospheric nitrogen into usable ammonia

Answer

Nitrogen-fixing cyanobacteria like Anabaena convert N2 into NH3, enriching paddy soils and reducing the need for nitrogen fertilizers.

Question 4

Which of the following is an example of a parasitic plant that has lost most photosynthetic ability?

Accepted Answer

Dodder (Cuscuta)

Answer

Dodder is a parasitic plant with minimal chlorophyll that extracts water and nutrients from host plants via haustoria.

Question 5

Prochlorococcus is ecologically significant because it is:

Accepted Answer

The most abundant photosynthetic organism on Earth

Answer

Prochlorococcus is a tiny marine cyanobacterium estimated to be the most abundant photosynthetic organism, responsible for a large portion of ocean primary productivity.

Photosynthesis Practice Test

Photosynthesis Practice Test

Photosynthesis Photosynthetic Organisms 4