Heredity

CBSE Class 10 Science · every board question from this chapter, 2025–2025 · 12 of them repeated across years

• A tall pea plant with round seeds (TTRR) is crossed with a short pea plant with wrinkled seeds (ttrr). The F 1 generation will be2025asked 2×
• Mendel obtained F 2 generation by2025
• When a pure-tall pea plant is crossed with a pure-dwarf pea plant, the percentage of tall pea plants in F 1 and F 2 generation…2025asked 3×
• If pea plants with round and green seeds (RRyy) are crossed with pea plants having wrinkled and yellow seeds (rrYY), the seeds…2025asked 3×
• Assertion: A mango seed will germinate to form a mango tree. Reason (R): Heredity determines the process by which traits and…2025asked 3×
• Assertion: A human child bears all the basic features of human beings. Reason (R): It looks exactly like its parents, showing…2025asked 3×
• Assertion: In reptiles, the temperature at which the fertilized eggs are kept decides the sex of the offsprings. Reason (R): Sex…2025asked 3×
• "Proteins control the expression of various characters." Explain this statement by taking an example of "tallness" as a…2025asked 3×
• Explain how the proteins control the 'characteristics' in an organism with the help of an example of 'short height' trait in pea…2025
• Explain with the help of a flow chart that in human beings father is responsible for the sex (male or female) of the child.2025asked 2×
• "Sex of the children is determined by type of sex chromosome which they inherit from their father." Justify the statement.2025
• Pure-tall (TT) pea plants are crossed with pure-dwarf (tt) pea plants. The pea plants obtained in F 1 generation are then self…2025
• Explain how the proteins control the 'characteristics' in an organism with the help of an example of 'tallness' trait in pea…2025
• "In human beings the genes inherited from the parents decide whether the newborn individual is male or female." Explain this…2025
• A pure pea plant bearing terminal flowers was cross-pollinated with a pure plant having axillary flowers. In F 1 generation,…2025
• The lowest part of the ear called earlobe, is closely attached to the side of the head in some of us (Figure 'X'), and not in…2025asked 2×
• A pure pea plant having round (R), yellow (Y) seeds is crossed with another pure pea plant having wrinkled (r), green (y) seeds.…2025asked 3×
• How many chromosomes are present in human beings? Out of these how many are sex chromosomes? Explain how, in sexually reproducing…2025
• What are chromosomes? Explain in brief how stability of DNA content of a species is ensured in sexually reproducing organisms?2025
• The gene combination of purple flowered pea plants is denoted as (WW) and that of white flowered pea plants as (ww), when these…2025asked 2×
• In one of Mendalian experiments, when F 1 generation pea plants with round yellow seeds were self-pollinated, pea seeds with the…2025
• In human beings, there are 23 pairs of chromosomes. Out of these 23 pairs of chromosomes (i.e. 46 chromosomes), 22 pairs of…2025asked 3×

Answers come from CBSE’s own marking schemes. How we source them.