Inheritance and VariationPractice Questions & MCQs
Practice Inheritance and Variation questions from Heredity (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.
Inheritance and VariationQuiz - Solve & Score
Q1. Consider the following statements about inheritance and variation: (I) Genes are units of heredity. (II) Variation arises mainly in sexual reproduction. (III) Acquired traits are always inherited. Which of the above statement(s) is/are correct?
- A.Only I
- B.Only I and II
- C.Only III
- D.None of these
Answer: B. Only I and II
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 = Only I and II. That fits the listed correct option directly - Correct. Looking at the others: option A) 'Only I' is incorrect: Re-check each statement individually; option C) 'Only III' fails since Re-check each statement individually. Hence the answer is B) Only I and II.
Q2. The unit of inheritance that controls a trait is the:
- A.ribosome
- B.cell wall
- C.vacuole
- D.gene
Answer: D. gene
From the stem we have: the data stated in the problem. Required: the unknown asked in the stem. Working tool - hence the answer = gene. This is the equation that links the given quantities to the unknown (biology, chapter 'Heredity'). What makes this the correct method - set up a Punnett square with the given parental genotypes. So the answer is D) gene. Wrong options at a glance: option A) 'ribosome' fails since Ribosomes make proteins; genes carry heredity; option B) 'cell wall' is incorrect: The cell wall supports plant cells, not heredity; option C) 'vacuole' doesn't hold - Vacuoles store substances, not heredity.
Q3. If a tall plant has the genotype Tt, its tallness is shown because T is:
- A.recessive to t
- B.dominant over t
- C.the same as t
- D.an acquired trait
Answer: B. dominant over t
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