Consider the following statements regarding photosynthesis: 1. Light reactions occur in the thylakoid membranes. 2. Oxygen is released from carbon dioxide. 3. ATP and NADPH are produced in the light reactions. Which of the above is/are correct? MCQ with Answer and Explanation

Explanation:
Biotin (vitamin B₇) is a coenzyme for carboxylases, e.g., pyruvate carboxylase, acetyl-CoA carboxylase. It is involved in gluconeogenesis and fatty acid synthesis. Deficiency is rare but can occur with raw egg white consumption.

Explanation:
The thymus is a lobulated lymphoid organ located in the upper part of the thoracic cavity, near the heart. It is most prominent and active during childhood and begins to atrophy (involute) after puberty. Its primary function is to provide a microenvironment for the differentiation, selection, and maturation of T-lymphocytes (T cells), which are crucial for cell-mediated immunity. The thymus also secretes hormones like thymosin, which aid in T-cell development.

Explanation:
In aquatic plants like Hydrilla, the rate of photosynthesis can be estimated by counting the number of oxygen bubbles released per minute under light. Manometry measures pressure changes, respirometry respiration, spectrophotometry light absorbance.