Consider statements about microorganisms: 1. Lactobacillus is used in curd formation. 2. Saccharomyces is used in bread making. 3. Aspergillus is used in the production of citric acid. Which are correct? MCQ with Answer and Explanation

Explanation:
The femur (thigh bone) is the longest, heaviest, and strongest bone in the human skeleton. The stapes (stirrup) is a small bone in the middle ear and is the smallest bone in the human body. The hyoid bone is a U-shaped bone in the neck that supports the tongue; it is unique because it is not articulated (jointed) with any other bone, but is suspended by muscles and ligaments. Thus, statements 1 and 2 are correct.

Explanation:
In DNA, guanine (G) pairs with cytosine (C) via three hydrogen bonds. Adenine pairs with thymine (two bonds). Uracil replaces thymine in RNA. Complementary base pairing is key to DNA structure and replication.

Explanation:
A balanced diet contains all the essential macronutrients (carbohydrates, proteins, fats) and micronutrients (vitamins, minerals) in the correct proportions required for optimal health, growth, and maintenance. Malnutrition is a broad term that refers to deficiencies, excesses, or imbalances in a person's intake of energy and/or nutrients; it includes both undernutrition (wasting, stunting) and overnutrition (overweight, obesity). Water is an essential nutrient, crucial for hydration, transport, and all biochemical reactions. Thus, statements 1 and 3 are correct.