Stem Cell Properties Steps:

• Recall stem cell definition: undifferentiated cells that self-renew via mitosis.
• Evaluate first property: division by mitosis produces more stem cells – true (✓).
• Evaluate second property: direct differentiation into specialised cells – false (x), as stem cells maintain undifferentiated state.
• Evaluate third property: direct repair of damaged cells – false (x), as repair occurs via applications, not inherent ability.

Why B is correct:

• Matches definition where stem cells self-renew (mitosis for more stem cells) but do not themselves differentiate or repair; those involve progeny or therapy.

Why the others are wrong:

• A: Incorrectly marks differentiation as true (✓); stem cells do not differentiate directly.
• C: Falsely marks all as untrue, ignoring self-renewal.
• D: Falsely marks only repair as true (✓), ignoring self-renewal.

Final answer: B