Reproduction Heredity and Evolution (Class 10)

What this worksheet covers

This is an eighteen-question practice worksheet on reproduction, heredity and evolution for Class 10, written to the pattern of the SOF National Science Olympiad (NSO). It carries 24 marks and is designed to be attempted in 45 minutes, split across three sections — Scientific Reasoning, Applying What You Know and Achievers Section. Every question is multiple choice with exactly one correct option, and every one comes with a fully worked solution rather than just an answer key — so a child who gets one wrong can see where the reasoning went astray instead of only learning that it did.

Skills your child practises

• Applied problem-solving on reproduction, heredity and evolution at Class 10 level
• Working accurately against a time limit, as the real paper demands
• Scientific Reasoning questions in the olympiad format
• Applying What You Know questions in the olympiad format
• Achievers Section questions in the olympiad format
• Reading worked solutions to find the step that went wrong

How to use it

1. 1There are 18 questions in this worksheet. All questions are compulsory.
2. 2Each question has four options (A), (B), (C) and (D). Exactly one option is correct.
3. 3Questions 1–15 carry 1 mark each. Questions 16–18 (Achievers Section) carry 3 marks each.
4. 4There is no negative marking. Study every diagram and table carefully.

Sample questions from this worksheet

A preview of what's inside Reproduction Heredity and Evolution (Class 10) — the PDF has the full set, and every question comes with a worked solution like these.

1. 1. Amoeba reproduces asexually by _______.

   • AFragmentation
   • BBudding
   • CSpore formation
   • DBinary fissioncorrect
   Solution: An Amoeba splits into two roughly equal daughter cells, which is binary fission. Budding, seen in yeast and Hydra, produces a small outgrowth instead.

2. 2. In Mendel’s monohybrid cross between a tall and a dwarf pea plant, the F₂ generation showed tall and dwarf plants in the ratio _______.

   • A3 : 1correct
   • B1 : 1
   • C9 : 3 : 3 : 1
   • D2 : 1
   Solution: All the F₁ plants were tall, and self-pollinating them gave tall and dwarf plants in the ratio 3 : 1. The dwarf trait reappears because it was carried, hidden, through the F₁ generation.

3. 3. Assertion (A): If a person builds strong muscles through years of exercise, their children are not born with strong muscles.Reason (R): Traits acquired during an individual’s lifetime do not change the DNA of the germ cells, so they are not inherited.

   • ABoth A and R are true and R is the correct explanation of Acorrect
   • BBoth A and R are true but R is not the correct explanation of A
   • CA is true but R is false
   • DA is false but R is true
   Solution: Only changes in the DNA of the germ cells pass to the next generation. Exercise alters body cells alone, so the trait dies with the individual. Both statements are true and the second is exactly why the first holds, so R explains A.