Excretion in Humans and PlantsPractice Questions & MCQs
Practice Excretion in Humans and Plants questions from Life Processes (Class 10 Science) - important MCQs with answers and step-by-step solutions. Solve the sample questions below, then practice the full set free on the RankByte app.
Excretion in Humans and PlantsQuiz - Solve & Score
Q1. Consider the following statements about excretion: (I) The nephron is the functional unit of the kidney. (II) Urea is made in the liver. (III) Dialysis is used when the lungs fail. Which of the above statement(s) is/are correct?
- A.Only III
- B.None of these
- C.Only I
- D.Only I and II
Answer: D. Only I and II
Eliminate first - option A) 'Only III' is incorrect: Re-check each statement individually; option B) 'None of these' is incorrect: Re-check each statement individually; option C) 'Only I' fails since Re-check each statement individually. That leaves only option D). Confirm with the chapter rule: Correct: I, II (biology, chapter 'Life Processes'). Answer: D) Only I and II.
Q2. The artery that brings blood to the kidney for filtration is the:
- A.pulmonary artery
- B.renal artery
- C.coronary artery
- D.hepatic artery
Answer: B. renal artery
To see why, recall that An ionic bond forms when a metal donates electrons to a non-metal: e.g. Na -> Na+ + e-, Cl + e- -> Cl-, and Na+ + Cl- -> NaCl; the resulting solid is held by strong electrostatic attraction => this fixes the property asked in the stem; hence the answer = renal artery. That fits the listed correct option directly - Correct. Quickly on the wrong ones: option A) 'pulmonary artery' is wrong because That goes to the lungs; option C) 'coronary artery' misses the point - That supplies the heart muscle. Hence the answer is B) renal artery.
Q3. After filtration and reabsorption, urine collects in the:
- A.liver
- B.glomerulus
- C.urinary bladder
- D.lungs
Answer: C. urinary bladder
The idea this question leans on: An ionic bond forms when a metal donates electrons to a non-metal: e.g. Na -> Na+ + e-, Cl + e- -> Cl-, and Na+ + Cl- -> NaCl; the resulting solid is held by strong electrostatic attraction => this fixes the property asked in the stem; hence the answer = urinary bladder. That fits the listed correct option directly - Correct. Looking at the others: option A) 'liver' is wrong because The liver makes urea; urine is stored in the bladder; option B) 'glomerulus' is wrong because The glomerulus filters; urine collects in the bladder. Hence the answer is C) urinary bladder.
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