Human Body and Health (Class 3)

What this worksheet covers

This is a fifteen-question practice worksheet on human body and health for Class 3, written to the pattern of the SOF National Science Olympiad (NSO). It carries 21 marks and is designed to be attempted in 40 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 human body and health at Class 3 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 15 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 1–12 carry 1 mark each. Questions 13–15 (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 Human Body and Health (Class 3) — the PDF has the full set, and every question comes with a worked solution like these.

1. 1. The framework of bones in our body is called the _______.

   • AMuscle
   • BNerve
   • CJoint
   • DSkeletoncorrect
   Solution: The skeleton is the frame of 206 bones that gives the body its shape, supports it and protects the delicate organs inside.

2. 2. A child eats only rice, chapati and potatoes and no dal, milk or vegetables. Which problem is he most likely to face?

   • AHe will grow too fast
   • BHe will not grow well, as his diet lacks body-building and protective foodscorrect
   • CHe will have too much energy
   • DNothing will happen
   Solution: Rice, chapati and potato are all energy-giving foods. Without dal, milk, eggs or vegetables he gets very little protein, vitamins or minerals, so he will not grow well and may fall ill easily.

3. 3. Consider the following statements.(i) Muscles work by pulling on bones, never by pushing them.(ii) The windpipe carries food to the stomach.(iii) Exercise makes muscles and bones stronger.Which of the statements is/are correct?

   • A(i) and (ii) only
   • B(i) and (iii) onlycorrect
   • C(ii) and (iii) only
   • DAll three
   Solution: Statement (i) is true — this is why muscles are arranged in pairs that pull in opposite directions. Statement (ii) is false; the windpipe carries air to the lungs, while the food pipe carries food to the stomach. Statement (iii) is true. Hence (i) and (iii).