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Which of the following serves as a source for both Vitamin B1 (Thiamine) and Vitamin B2 (Riboflavin)?
Table 10.3 lists 'Yeast' as a source for Vitamin B1 and 'Yeast, milk, egg white, liver, kidney' as sources for Vitamin B2. Thus, yeast is common to both.
Which vitamin acts as a coordination compound of cobalt, essential for preventing pernicious anaemia?
The text states, 'Vitamin B12, cyanocobalamine, the anti–pernicious anaemia factor, is a coordination compound of cobalt.'
Rickets in children and osteomalacia in adults are deficiency diseases of which vitamin?
Table 10.3 indicates that 'Rickets (bone deformities in children) and osteomalacia (soft bones and joint pain in adults)' are deficiency diseases of Vitamin D.
What is the primary reason that water-soluble vitamins must be regularly supplied in the diet, unlike fat-soluble vitamins?
The NCERT text explains, 'Water soluble vitamins must be supplied regularly in diet because they are readily excreted in urine and cannot be stored (except vitamin B12) in our body.'
Increased fragility of RBCs and muscular weakness are symptoms of the deficiency of which vitamin?
The table mentions 'Increased fragility of RBCs and muscular weakness' as a deficiency symptom of Vitamin E.
Which of the following vitamins is synthesized by the bacteria of the gut?
The text states, 'However, the bacteria of the gut can produce some of the vitamins required by us.'
The precursor term 'Vitamine' was eventually shortened to 'Vitamin' because:
The NCERT text clarifies, 'Later work showed that most of them did not contain amino groups, so the letter ‘e’ was dropped and the term vitamin is used these days.'
A person suffering from bleeding gums and slow wound healing would likely be deficient in which vitamin?
Scurvy, characterized by bleeding gums, is listed as a deficiency disease of Vitamin C (Ascorbic acid) in Table 10.3. Vitamin C is crucial for collagen formation and wound healing.
Which of the following is a fat-soluble vitamin found in green leafy vegetables and plays a role in blood clotting?
Table 10.3 states that Vitamin K's source includes green leafy vegetables and its deficiency leads to 'Increased blood clotting time', confirming its role in blood clotting. The classification section also lists Vitamin K as fat-soluble.
Which of the following statements about thermal expansion is INCORRECT?
The context states: 'Here $\alpha_V$ is also a characteristic of the substance but is not strictly a constant. It depends in general on temperature (Fig 10.6). It is seen that $\alpha_V$ becomes constant only at a high temperature.' Therefore, option 3 is incorrect.
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