Which of the following pathways of CO2 fixation is found in algae and green plants? a. the reverse citric acid cycle b. the 3-hydroxypropionate pathway c. the acetyl-CoA pathway d. the Calvin-Benson-Bassham pathway

D. the Calvin-Benson-Bassham pathway

Explanation:

The Calvin-Benson-Bassham pathway commonly called the C3 pathway is the sequential step of reactions taking place in the stroma of the chloroplast. The Calvin cycle was studied by the radioactive studies in the green alga by Melvin Calvin.

The Calvin cycle takes place in almost every photosynthetic organism from green algae to green plants. The Calvin cycle is important for the plants as it forms the glucose molecules by the fixation of the carbon from the atmosphere and thus is also known as the Carbon fixation cycle in plants.

Thus, Option-D is correct.

answer: - few nutrients

high pressure

low temperatures

explanation: 1. few nutrients:   open-ocean zone is located way far from the land, which is the main source of the essential nutrients.2. high pressure: pressure increases by 1 atmosphere for every 10 meters increase in depth.3. ample sunlight: a large fraction of the sunlight is reflected back to the atmosphere from the sea surface. 4. varying salinity: below the thermocline, the water is isolated from the atmosphere so the salinity remains stable over the year.5. low temperatures:   the temperature of open-ocean zone ranges from a low of -2°c to an average of 17°c