Respiration and Transportation (Class 7)

What this worksheet covers

This is an eighteen-question practice worksheet on respiration and transportation in organisms for Class 7, 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 respiration and transportation in organisms at Class 7 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 Respiration and Transportation (Class 7) — the PDF has the full set, and every question comes with a worked solution like these.

1. 1. The breakdown of glucose in the presence of oxygen is called _______ respiration.

   • AAquatic
   • BAnaerobic
   • CArtificial
   • DAerobiccorrect
   Solution: Aerobic respiration uses oxygen and releases a great deal of energy, giving carbon dioxide and water. Anaerobic respiration happens without oxygen.

2. 2. Exhaled air is passed through lime water and the lime water turns milky. What does this show?

   • AExhaled air contains oxygen
   • BExhaled air is warmer
   • CExhaled air contains nitrogen
   • DExhaled air contains carbon dioxidecorrect
   Solution: Lime water turns milky only in the presence of carbon dioxide. Since exhaled air produces this change much faster than inhaled air, it shows that respiration releases carbon dioxide.

3. 3. Consider the following statements.(i) Respiration and breathing mean the same thing.(ii) Anaerobic respiration releases less energy than aerobic respiration.(iii) Plants respire only at night.Which of the statements is/are correct?

   • A(i) only
   • B(ii) onlycorrect
   • C(i) and (ii) only
   • D(ii) and (iii) only
   Solution: Statement (i) is false — breathing is only the taking in and giving out of air, while respiration is the release of energy from food inside every cell. Statement (ii) is true; glucose is only partly broken down without oxygen. Statement (iii) is false; plants respire day and night, though during the day photosynthesis masks it. Hence (ii) only.