Which of the following plants utilizes the C4 photosynthetic pathway? MCQ with Answer and Explanation

Explanation:
Folic acid (vitamin B₉) is crucial for DNA synthesis and cell division; its deficiency during early pregnancy increases the risk of neural tube defects like spina bifida. Many countries fortify flour with folic acid. Vitamin A is for vision, C for collagen, D for calcium. Women of childbearing age are advised to take supplements.

Explanation:
Vitamin B6, in its active form pyridoxal phosphate (PLP), is a crucial water-soluble coenzyme involved in over 100 enzymatic reactions, primarily in amino acid metabolism (transamination, decarboxylation) and fatty acid metabolism. It is also essential for neurotransmitter synthesis and hemoglobin formation. Vitamins A, D, and K are fat-soluble vitamins. Exam tip: B-complex and C are water-soluble; A, D, E, K are fat-soluble.

Explanation:
Citrus canker is a bacterial disease caused by Xanthomonas citri (syn. X. axonopodis pv. citri). It produces raised necrotic lesions on leaves, fruit, and stems, causing defoliation and reduced yield. It spreads via rain splash and contaminated tools. No viral or fungal causal agent.