A. The rate of organic matter production after accounting for respiration
B. The rate of storage of organic energy by consumers
C. The rate of decomposition by microbes
D. The total rate of photosynthesis or organic matter production by producers
Answer: Option D
Solution (By JKSSB Mock Tests)
Gross Primary Productivity (GPP) is the total rate of photosynthesis, or the total amount of organic matter (biomass) produced by producers (plants) per unit area per unit time, including the organic matter used in respiration. Net Primary Productivity (NPP) is GPP minus the energy used by the plants for respiration (NPP = GPP - R).
Explanation:
Magnesium (Mg²⁺) is the central atom in the porphyrin ring of chlorophyll, essential for absorbing light energy during photosynthesis. Iron is central in heme (hemoglobin, cytochromes). Calcium is a secondary messenger and structural component, zinc is a cofactor. Magnesium deficiency causes chlorosis.
Explanation:
Adenosine triphosphate (ATP) stores energy in its high-energy phosphate bonds and releases it for cellular work. Glucose and NADH are fuel molecules, not direct energy carriers.
Explanation:
Vitamin A (Retinol) is essential for the formation of rhodopsin (visual purple), a pigment in the rod cells of the retina necessary for vision in low light conditions. Deficiency of Vitamin A leads to night blindness (nyctalopia), where a person has difficulty seeing in dim light. Severe deficiency can also cause xerophthalmia and complete blindness.
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