Which of the following statements about the human blood is correct? MCQ with Answer and Explanation

Explanation:
DNA (deoxyribonucleic acid) is characterized by the presence of the pentose sugar deoxyribose in its nucleotide backbone. RNA (ribonucleic acid) contains the pentose sugar ribose. DNA is typically a double-stranded helical molecule, providing stability for long-term genetic storage. RNA is generally single-stranded, allowing it to fold into complex shapes and perform various functional roles like mRNA, tRNA, and rRNA. Thus, statements 1 and 2 are correct.

Explanation:
Poultry farming involves rearing birds like chickens for the production of eggs (layers) and meat (broilers). Apiculture (beekeeping) not only produces honey but also significantly increases crop yields through enhanced pollination by bees. Dairy farming focuses on the breeding and rearing of cattle, buffaloes, etc., for milk production, not fish (which is pisciculture). Thus, statements 1 and 2 are correct.

Explanation:
Carbohydrates are the main and most readily available source of energy for cellular processes. Proteins are polymers of amino acids linked by peptide bonds, not fatty acids, which are components of lipids. Vitamins are micronutrients required in very small (trace) quantities for normal metabolism, unlike macronutrients. Therefore, only statement 1 is correct.