Golden Rice is a genetically modified crop developed primarily to combat the deficiency of:
A. Protein
B. Iron
C. Vitamin A
D. Vitamin C
Answer: Option C
Solution (By JKSSB Mock Tests)
Golden Rice is a transgenic variety of rice (Oryza sativa) engineered to produce beta-carotene, a precursor of Vitamin A, in the edible endosperm. The beta-carotene gives the rice grains a characteristic golden-yellow color. It was developed to address Vitamin A deficiency (VAD), a major public health issue in developing countries that causes blindness and increases susceptibility to infectious diseases in children.
Consider statements about plant biology: 1. Xylem transports water. 2. Phloem transports food. 3. Cambium is responsible for primary growth. Which are correct?
Explanation:
Xylem is the vascular tissue responsible for the unidirectional upward transport of water and dissolved minerals from the roots to the aerial parts of the plant. Phloem is the vascular tissue responsible for the translocation of organic nutrients (primarily sucrose) from sources to sinks, which can be bidirectional. Cambium (vascular and cork) is a lateral meristem responsible for secondary growth (increase in girth); primary growth (increase in length) is driven by apical meristems. Thus, statements 1 and 2 are correct.
Explanation:
The sperm cell is the smallest cell in the human body, about 5 µm in length (head). The ovum is the largest (about 100 µm diameter). RBCs are about 7-8 µm, neurons can be up to a meter long. Sperm cells are highly specialized for motility and genetic material delivery.
Explanation:
Riboflavin is vitamin B₂, a component of coenzymes FAD and FMN involved in redox reactions. Thiamine is B₁, niacin is B₃, pyridoxine is B₆. Riboflavin deficiency causes angular stomatitis.
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