Photosynthesis

To solve the problem, we need to identify the element that is important in determining solute concentration and oxygen evolution.

1. Understanding the Question:
The question is asking for the element that plays a crucial role in processes related to solute concentration and oxygen evolution, which are key in biological and chemical systems, particularly in photosynthesis.

2. Analyzing the Elements:
Each option refers to an element that might have a role in these processes:

• Zinc: Zinc is important in various enzymatic reactions, but it is not directly involved in oxygen evolution.
• Boron: Boron plays a role in plant cell wall structure and may influence growth, but it is not primarily responsible for oxygen evolution or solute concentration regulation.
• Nickel: Nickel is essential for certain enzymes in plants and microorganisms, but it is not directly related to oxygen evolution.
• Chlorine: Chlorine is important for the regulation of osmosis in plant cells and plays a role in oxygen evolution during photosynthesis. It is a key element in the oxygen-evolving complex of photosystem II in plants.

3. Conclusion:
Chlorine is the element most relevant to the question, as it is involved in both solute concentration regulation and the process of oxygen evolution in photosynthesis.

Final Answer:
The correct answer is (D) Chlorine.

To solve the problem, we need to determine the ratio of trioses formed, net gain, and the amount used to regenerate RUBP in the Calvin cycle.

1. Understanding the Calvin Cycle:
In the Calvin cycle, carbon dioxide is fixed into a three-carbon compound (triose), which is used to regenerate RUBP (Ribulose Bisphosphate) and to form sugars. The cycle involves both the formation of trioses and their subsequent use to regenerate RUBP.

2. Analyzing the Ratios:
The typical ratios in the Calvin cycle are:
Triose formation: Three carbon compounds (trioses) are formed.
Net gain: The net gain refers to the number of trioses that contribute to the production of sugars or other compounds.
Used to regenerate RUBP: A portion of the trioses is used to regenerate RUBP so the cycle can continue. The standard ratio of these three components is generally 6:1:5.
This represents 6 molecules of trioses, 1 molecule of net gain, and 5 molecules used to regenerate RUBP.

3. Conclusion:
Based on the standard ratios in the Calvin cycle, the correct option is:

Final Answer:
The correct option is (C) 6:1:5.

Antennae in light harvesting complexes absorb light of various wavelengths, which is essential for capturing energy during photosynthesis.
The assertion is correct because the antennae are indeed light harvesting complexes composed of proteins and pigments.
The reason is also correct, as antennae absorb different wavelengths of light.
Final Answer:
A and R are correct. R is the correct explanation of A.

Step 1: In non-cyclic photophosphorylation, electrons are excited in PS II (Photosystem II), where water molecules are split, releasing oxygen and electrons. These excited electrons are passed along the electron transport chain and used to generate ATPs through chemiosmosis. For every two electrons excited from PS II, 3 ATP molecules are produced in the process.
Step 2: In cyclic phosphorylation, electrons are excited in PS I (Photosystem I), but instead of being passed to NADP+ to form NADPH, they are returned to the electron transport chain. This cycle generates additional ATPs but does not contribute to the production of NADPH. For every two electrons excited from PS I during cyclic phosphorylation, 2 ATP molecules are produced.
Step 3: To form 120 ATPs, the ratio of electrons excited from PS II during non-cyclic phosphorylation to those excited from PS I during cyclic phosphorylation is 2:3. This ratio is essential for maintaining the balance between ATP and NADPH production during the light reactions of photosynthesis.
Conclusion: The correct ratio of electrons excited from PS II (non-cyclic) to PS I (cyclic) to form 120 ATPs is 2:3.