Correct Option: B. Retarded Growth Detailed Explanation: Calcium is an essential mineral that plays a crucial role in various bodily functions, particularly in the development and maintenance of bones and teeth. It is also involved in muscle contraction, blood clotting, and nerve transmission. When there is a deficiency of calcium in the diet, it can lead to several health issues, one of which is retarded growth, especially in children and adolescents.

1. Role of Calcium in Growth:
2. Calcium is vital for the development of the skeletal system. During childhood and adolescence, the body is growing rapidly, and adequate calcium intake is necessary to ensure that bones develop properly and reach their full potential in size and strength.
3. Calcium works in conjunction with vitamin D, which helps the body absorb calcium effectively. Without sufficient calcium, the body cannot form strong bones, leading to conditions such as rickets in children, which is characterized by weak or soft bones.
4. Consequences of Calcium Deficiency:
5. In children, a lack of calcium can lead to stunted growth, as their bodies may not be able to produce the necessary bone mass. This can result in shorter stature and increased risk of fractures.
6. In adolescents, calcium deficiency can hinder the attainment of peak bone mass, which is crucial for long-term bone health. This can lead to osteoporosis later in life, where bones become brittle and more susceptible to fractures.
7. Why Other Options Are Incorrect:
8. A. Anaemia: Anaemia is primarily related to deficiencies in iron, vitamin B12, or folate, rather than calcium. While calcium is important for overall health, it does not directly influence the production of red blood cells or hemoglobin, which are critical for preventing anaemia.
9. C. Sterility: Sterility or infertility can be influenced by various factors, including hormonal imbalances, genetic issues, and environmental factors. While calcium plays a role in overall health, it is not directly linked to fertility issues. Other nutrients, such as zinc and folate, are more critical in reproductive health.
10. D. Goitre: Goitre is an enlargement of the thyroid gland, often caused by iodine deficiency. Calcium does not play a direct role in thyroid function or the development of goitre. Iodine is the key nutrient needed to prevent goitre, as it is essential for the production of thyroid hormones.

Summary of Key Points:

• Calcium is essential for bone growth and development, particularly in children and adolescents.
• A deficiency in calcium can lead to retarded growth and increased risk of bone-related diseases.
• Other options (anaemia, sterility, goitre) are not directly related to calcium deficiency and involve different nutrients or factors.
• Ensuring adequate calcium intake is crucial for maintaining healthy bones and overall growth during developmental stages.

By understanding the importance of calcium and its role in growth, students can appreciate the need for a balanced diet that includes sufficient amounts of this vital mineral.