Consider the following statements about antibodies: 1. They are produced by T-lymphocytes. 2. They are also called immunoglobulins. 3. They specifically bind to antigens. Which of the above is/are correct? MCQ with Answer and Explanation

Explanation:
Phototropism is the directional growth of a plant organ in response to light, typically positive in shoots. Geotropism (gravitropism) is the growth response to gravity, with roots showing positive geotropism (growing down) and shoots negative geotropism (growing up). Thigmotropism is the growth response to touch or physical contact, seen in climbing plants like vines, not water (which is hydrotropism). Thus, statements 1 and 2 are correct.

Explanation:
Vitamin D (calciferol) promotes the absorption of calcium and phosphorus from the small intestine by inducing synthesis of calcium-binding proteins. It is synthesized in the skin upon exposure to UV light and then activated in the liver and kidneys. Deficiency leads to rickets in children and osteomalacia in adults. Vitamin A is for vision, C for collagen, B₁ for energy metabolism.

Explanation:
Sericulture involves the cultivation of mulberry plants (Morus alba) and rearing of the silkworm Bombyx mori to produce raw silk. Apiculture is beekeeping, pisciculture is fish farming, vermiculture is earthworm rearing for compost. India is the second-largest producer of silk after China, producing mulberry, tasar, eri, and muga silk.