Class 10 Science — Chapter 8: Heredity
66 practice questions · 22 Easy · 22 Medium · 22 Hard
Practise Class 10 Science Chapter 8, "Heredity", with 66 NCERT-aligned multiple-choice questions. The set is split into 22 Easy, 22 Medium and 22 Hard questions, so you can warm up on the fundamentals and then push into the exam-level problems that separate top scorers in CBSE Board exams and the JEE & NEET foundation years.
"Heredity" is one of the chapters where concept clarity across physics, chemistry and biology basics really pays off. Each MCQ on this chapter is timed and uses exam-grade marking (+2 correct, −1 wrong, 0 skipped), training the same accuracy-under-pressure that real papers demand. Every question carries a short explanation, so a wrong answer becomes a quick lesson rather than a dead end — the fastest way to close gaps before a test.
Use this chapter as targeted revision: attempt the Easy set first to confirm your basics on Heredity, then move to Medium and Hard to test application and problem-solving. Your accuracy, streaks and XP save automatically, and the chapter feeds into your overall Class 10 Science mastery score. A few sample questions are shown below; sign in free to practise all 66.
Key concepts: Heredity (Class 10 Science)
Heredity is the passing of traits from parents to offspring. This chapter explains Mendel's laws of inheritance and how sex is determined in humans.
- Heredity and variation
- Traits are inherited through genes; differences among offspring are called variation. Traits can be dominant or recessive.
- Mendel's monohybrid cross
- Crossing one pair of contrasting traits gives a 3:1 ratio in the F₂ generation, showing the law of dominance and segregation.
- Mendel's dihybrid cross
- Crossing two pairs of traits gives a 9:3:3:1 ratio, showing independent assortment of genes.
- Genotype vs phenotype
- Genotype is the genetic make-up (e.g. Tt); phenotype is the observable trait (e.g. tall).
- Sex determination
- Humans have XX (female) and XY (male). The father's gamete (X or Y) decides the sex of the child.
Key formulas — Heredity
💡 Exam tips for Heredity
- A recessive trait appears only in the homozygous (e.g. tt) condition.
- Because the mother is always XX, it is the father's sperm (X or Y) that determines the child's sex.
Sample questions
Father of genetics:
Gregor Mendel laid the foundation of genetics.
Phenotypic ratio of F2 in a monohybrid cross:
Dominant : recessive = 3 : 1.
Phenotypic ratio of F2 in a dihybrid cross:
Independent assortment yields 9:3:3:1.
Heredity — FAQs
What are the key concepts in Class 10 Science Heredity?+
Heredity is the passing of traits from parents to offspring. This chapter explains Mendel's laws of inheritance and how sex is determined in humans. Key ideas include Heredity and variation, Mendel's monohybrid cross, Mendel's dihybrid cross, Genotype vs phenotype, Sex determination.
What does Class 10 Science Chapter 8 (Heredity) cover on XamBaaz?+
It covers 66 NCERT-aligned MCQs on "Heredity" — 22 Easy, 22 Medium and 22 Hard — each with a timed quiz and an instant explanation, suitable for CBSE Board exams and the JEE & NEET foundation years.
Are these "Heredity" questions free to practise?+
Yes — sign in with Google to practise "Heredity" free. Full unlimited access is ₹999/year (limited-time launch price), with no per-chapter charges.
How should I revise "Heredity" for the exam?+
Start with the Easy quiz to confirm your fundamentals, then attempt Medium and Hard for application-level practice. Review each explanation, retry the questions you miss, and track your accuracy on this chapter until it is consistently high.
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