The process of water loss as vapor from leaves is: MCQ with Answer and Explanation

Explanation:
Melanocyte-Stimulating Hormone (MSH) is a peptide hormone produced primarily by the intermediate lobe of the pituitary gland (pars intermedia), though in humans, this lobe is rudimentary and MSH is mainly derived from the cleavage of pro-opiomelanocortin (POMC) in the anterior lobe. Its primary function, especially in lower vertebrates like amphibians and reptiles, is to stimulate the melanocytes in the skin to produce and disperse melanin, the pigment responsible for skin, hair, and eye color, leading to darkening of the skin. In humans, its role in pigmentation is less significant.

Explanation:
Xylem is responsible for the unidirectional upward transport of water and minerals from roots to shoots. Phloem transports organic nutrients (food) from sources to sinks, which can be bidirectional (up or down). Cambium (vascular and cork) is a lateral meristematic (dividing) tissue responsible for secondary growth, not a permanent tissue. Thus, statements 1 and 2 are correct.

Explanation:
Collenchyma is a simple permanent tissue characterized by cells with thickened corners due to the deposition of cellulose and pectin. It provides mechanical support, tensile strength, and flexibility to the growing parts of the plant (like stems and petioles), allowing them to bend without breaking. Parenchyma is for storage, and sclerenchyma provides rigid support.