Identify the INCORRECT statement about the human ear: MCQ with Answer and Explanation

Explanation:
Vitamin A (retinol) is crucial for the synthesis of rhodopsin, maintaining normal vision, especially in dim light. Vitamin D deficiency impairs calcium absorption, leading to rickets in children. Vitamin C (ascorbic acid) is a water-soluble vitamin, not fat-soluble; vitamins A, D, E, and K are fat-soluble. Thus, statements 1 and 3 are correct.

Explanation:
Scurvy is caused by a deficiency of Vitamin C (ascorbic acid), leading to bleeding gums; rickets is caused by Vitamin D deficiency. Iron is essential for hemoglobin synthesis, and its deficiency leads to iron-deficiency anemia, causing fatigue and weakness. Iodine is required for thyroid hormone production, and its deficiency causes the enlargement of the thyroid gland, known as goiter. Thus, statements 2 and 3 are correct.

Explanation:
Xylem is a complex permanent tissue that conducts water and dissolved minerals from roots to the aerial parts. It consists of tracheids, vessels, xylem parenchyma, and fibers. Phloem transports organic solutes, collenchyma provides flexible support, epidermis protects.