Human Body Skeleton and Digestion (Class 4)

What this worksheet covers

This is a fifteen-question practice worksheet on human body — skeleton, teeth and digestion for Class 4, 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 — skeleton, teeth and digestion at Class 4 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 Skeleton and Digestion (Class 4) — the PDF has the full set, and every question comes with a worked solution like these.

1. 1. How many bones are there in the body of a normal adult human being?

   • A106
   • B206correct
   • C306
   • D406
   Solution: An adult skeleton has 206 bones. A newborn baby has about 300, but many of them fuse together as the child grows.

2. 2. Why must a suspected broken bone be kept as still as possible?

   • ABecause moving it can push the broken ends further apart and damage nerves and blood vesselscorrect
   • BSo that it heals faster on its own
   • CBecause moving it is painful only
   • DSo that the person can walk
   Solution: A fracture must be supported with a splint and kept still, because moving it can push the broken ends further apart and damage nearby nerves and blood vessels.

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) Bones are joined to one another at joints.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 come 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).