What is Transportation in Animals and Plants Class 7: Complete Guide

Definition and Importance of Transportation in Animals and Plants

Transportation in animals and plants refers to the movement of essential substances like water, nutrients, oxygen, and food from one part of the organism to another. This process is crucial because:

• It supplies cells with the materials needed for energy and growth.
• It removes waste products from cells.
• It helps maintain homeostasis and proper functioning.

In animals, transportation mainly involves blood carrying oxygen and nutrients. In plants, water and minerals move from roots to leaves, and food moves from leaves to other parts. Understanding this helps Class 7 students grasp how living organisms survive and function.

How Transportation Happens in Animals: The Circulatory System

Animals have a specialized system called the circulatory system to transport substances. Key components include:

• Heart: Pumps blood throughout the body.
• Blood: Carries oxygen, nutrients, and waste.
• Blood vessels: Arteries, veins, and capillaries that transport blood.

The heart beats to push oxygen-rich blood through arteries to organs and tissues. Veins carry oxygen-poor blood back to the heart and lungs for oxygenation. This continuous cycle ensures all body parts get what they need.

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

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

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

Transportation in Plants: Xylem and Phloem Explained

Plants transport substances through two main tissues:

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

Water absorption starts at the roots, moves upward through xylem vessels by capillary action and transpiration pull. Phloem distributes food produced by photosynthesis to stems, roots, and growing parts.

This system keeps plants nourished and healthy.

Role of Transpiration in Plant Transportation

Transpiration is the loss of water vapor from plant leaves through tiny openings called stomata. It plays a vital role in transportation by:

• Creating a suction force that pulls water upward from roots through xylem.
• Helping regulate temperature by cooling the plant.
• Maintaining water movement and nutrient supply.

Without transpiration, water movement in plants would slow down, affecting growth and survival.

Comparison Between Transportation in Animals and Plants

Here is a simple comparison to help Class 7 students understand the differences:

This comparison clarifies how transportation adapts to different organism needs.

Summary and Exam Tips for Class 7 NCERT Students

To prepare well for exams on Transportation in Animals and Plants:

• Focus on key terms like xylem, phloem, heart, blood vessels, and transpiration.
• Understand the functions of each component in transportation.
• Use diagrams to remember structures like the heart and plant vascular tissues.
• Practice explaining the process in your own words.

Remember, transportation is essential for survival, so questions often test your understanding of how substances move inside living things.