The disorder caused by the deficiency of antidiuretic hormone (ADH) is: MCQ with Answer and Explanation

The disorder caused by the deficiency of antidiuretic hormone (ADH) is:
A. Diabetes mellitus
B. Cushing's syndrome
C. Addison's disease
D. Diabetes insipidus
Answer: Option D
Solution (By JKExamLibrary)
Diabetes insipidus results from ADH deficiency (or resistance), causing polyuria, polydipsia, and dilute urine. Diabetes mellitus is insulin-related, Addison's is adrenal insufficiency, Cushing's is excess cortisol.

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Question #1
Consider statements about microorganisms: 1. Bacteria can be beneficial or harmful. 2. Fungi are used in food production. 3. Viruses are living outside a host. Which are correct?
A. 1 and 3 only
B. 1 and 2 only
C. 1, 2 and 3
D. 2 and 3 only

Correct Answer: Option B


Explanation:
Bacteria exhibit diverse roles; many are beneficial (e.g., gut flora, nitrogen fixers, decomposers), while some are pathogenic and cause diseases. Fungi are extensively used in food production, such as yeast (Saccharomyces) in baking and brewing, and molds (Penicillium) in cheese making (e.g., Roquefort, Camembert). Viruses are considered non-living outside a host cell because they lack metabolic machinery and cannot replicate independently; they only exhibit living characteristics when inside a host. Thus, statements 1 and 2 are correct.

This question belongs to: Science Biology
Question #2
The term 'biological magnification' refers to:
A. The increasing concentration of non-biodegradable toxic substances in organisms at higher trophic levels
B. The rapid growth of algae in nutrient-rich water bodies
C. The increase in biodiversity in a climax community
D. The increase in the number of organisms at higher trophic levels

Correct Answer: Option A


Explanation:
Biological magnification (or biomagnification) is the process where the concentration of persistent, non-biodegradable toxic substances (like DDT, mercury, or PCBs) increases progressively at each successive trophic level in a food chain. Because these substances are not metabolized or excreted, they accumulate in the tissues of organisms. Top predators end up with the highest, often lethal, concentrations of these toxins.

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Question #3
Consider statements about genetics: 1. DNA is transcribed into mRNA. 2. mRNA is translated into protein. 3. tRNA carries amino acids to the ribosome. Which are correct?
A. 2 and 3 only
B. 1 and 3 only
C. 1 and 2 only
D. 1, 2 and 3

Correct Answer: Option D


Explanation:
Transcription is the process where the genetic information in a DNA sequence is copied into a complementary messenger RNA (mRNA) molecule by RNA polymerase. Translation is the process where the mRNA sequence is decoded by ribosomes to synthesize a specific polypeptide (protein). Transfer RNA (tRNA) molecules act as adapters, carrying specific amino acids to the ribosome based on the mRNA codon. All statements are correct.

This question belongs to: Science Biology