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NEET UG Unit 6A: Toxicology, Infectious Diseases and Environmental Hazards — practice questions

Explore 19 free Unit 6A: Toxicology, Infectious Diseases and Environmental Hazards questions in NEET UG Environmental Science. Open each question or exercise to read its content, reference answers and available explanation.

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Unit 6A: Toxicology, Infectious Diseases and Environmental Hazards questions and exercises with answers

Showing questions 1–19 of 19.

Which property of muscle allows it to return to its original length after being stretched or contracted?Read the answer and worked solution →A tissue sample shows branching muscle fibres, striations, and involuntary action. It is most likelyRead the answer and worked solution →Which type of muscle assists in the movement of food through the digestive tract and movement of gametes?Read the answer and worked solution →Which combination correctly matches muscle type with its action and location?Read the answer and worked solution →Which feature is common to both skeletal muscle and cardiac muscle?Read the answer and worked solution →Which of the following is NOT a basic property of muscles mentioned here?Read the answer and worked solution →Muscles are specialized tissues of which embryonic origin?Read the answer and worked solution →Movement of limbs, jaw and tongue in humans primarily depends on the contractile property ofRead the answer and worked solution →Amoeboid movement is shown by which of the following cells?Read the answer and worked solution →The osmolarity of the medullary interstitium ranges approximately fromRead the answer and worked solution →Aldosterone secreted by the adrenal cortex acts on the DCT toRead the answer and worked solution →Protonephridia (flame cells) are the excretory structures ofRead the answer and worked solution →ADH (vasopressin) acts mainly on theRead the answer and worked solution →The Bowman's capsule visceral layer is composed of specialised cells calledRead the answer and worked solution →Atrial Natriuretic Factor (ANF) is released by theRead the answer and worked solution →In humans, the ascending limb of Henle is impermeable to water mainly becauseRead the answer and worked solution →The vasa recta arises fromRead the answer and worked solution →Renal calculi are typically formed byRead the answer and worked solution →Uraemia refers toRead the answer and worked solution →

Worked practice questions

Which property of muscle allows it to return to its original length after being stretched or contracted?

  1. Excitability
  2. Contractility
  3. Extensibility
  4. Elasticity
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Correct answer: D. Elasticity

Elasticity is the property by which muscle regains its original length after deformation. Extensibility allows stretching, while contractility allows shortening.

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A tissue sample shows branching muscle fibres, striations, and involuntary action. It is most likely

  1. skeletal muscle
  2. visceral muscle
  3. cardiac muscle
  4. tendon
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Correct answer: C. cardiac muscle

The key identifying features are branching fibres, alternate light and dark bands, and involuntary action. These together are characteristic of cardiac muscle, not skeletal or visceral muscle.

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Which type of muscle assists in the movement of food through the digestive tract and movement of gametes?

  1. Skeletal muscle
  2. Visceral muscle
  3. Cardiac muscle
  4. Tendon
Show answer and solution

Correct answer: B. Visceral muscle

Visceral muscle forms the inner wall of internal visceral organs and is involuntary. It helps in movement of food through the digestive tract and in movement of gametes.

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