Transportation in Animals and Plants Class 7 Extra Questions for Exam Success

Overview of Transportation in Animals and Plants for Class 7

Transportation is the process by which essential substances like water, nutrients, and gases move within animals and plants. In Class 7 NCERT science, this chapter explains how living organisms transport materials to survive and function properly.

Animals use blood and circulatory systems to transport oxygen, nutrients, and waste. Plants use xylem and phloem tissues to move water and food. Understanding these systems helps students answer extra questions and perform well in exams.

How Transportation Works in Animals: Blood and Circulatory System

In animals, transportation mainly involves the circulatory system. The heart pumps blood through:

• Arteries: Carry oxygen-rich blood from the heart to the body.
• Veins: Return oxygen-poor blood back to the heart.
• Capillaries: Tiny vessels where exchange of gases and nutrients occurs.

Blood carries oxygen, nutrients, hormones, and removes waste like carbon dioxide. The heart’s pumping action ensures continuous circulation.

Example:

If the heart pumps $70$ ml of blood per beat and beats $72$ times per minute, the volume pumped per minute is:

$$70 \times 72 = 5040 \text{ ml} = 5.04 \text{ litres}$$

This shows how much blood circulates every minute to keep the body alive.

Transportation in Plants: Role of Xylem and Phloem

Plants have two main transport tissues:

• Xylem: Transports water and minerals from roots to leaves.
• Phloem: Transports food (glucose) made in leaves to other parts.

Water moves upward in xylem due to transpiration pull and root pressure. Food moves in phloem through a process called translocation.

This system helps plants grow and stay healthy.

Common Extra Questions on Transportation in Class 7 NCERT

Extra questions often focus on key concepts and definitions, such as:

• What is the function of blood?
• How does the heart work?
• Differences between xylem and phloem?
• Explain the process of transpiration.

Sample Question:

Q: Why do veins have valves?

A: Veins have valves to prevent backflow of blood, ensuring it moves towards the heart.

Practicing such questions improves understanding and exam readiness.

Tips for Answering Transportation in Animals and Plants Questions

To excel in Class 7 NCERT science exams:

• Read questions carefully and underline keywords.
• Use diagrams to explain processes like blood circulation or plant transport.
• Write short, clear answers with examples.
• Revise formulas and definitions regularly.
• Practice extra questions from NCERT and other sources.

Example: When asked to explain blood circulation, mention heart, arteries, veins, and capillaries with their roles.