Class 7th science chapter 11 , Important topics and Notes


Comprehensive CBSE Class 7 Science Chapter 11 Notes: transportation in organism class 7th

Introduction

Transportation in living organisms is a vital process that ensures the efficient distribution of essential substances throughout the body. In CBSE Class 7 Science, Chapter 11 delves into the intricate mechanisms of transportation in both animals and plants. Understanding these processes is fundamental to grasping the functioning of organisms.

Overview of Transportation in Animals

Animals have evolved sophisticated systems to facilitate the movement of substances within their bodies. The circulatory system, comprising the heart, blood vessels, and blood, plays a pivotal role in this process. ncert class 7 chapter 11

Circulatory System Components

  1. Heart: Serves as the central pumping organ responsible for propelling blood throughout the body.
  2. Blood Vessels: Include arteries, veins, and capillaries, each with distinct functions in transporting oxygen, nutrients, and waste products.
  3. Blood: Comprises red blood cells, white blood cells, platelets, and plasma, carrying oxygen, hormones, and nutrients while removing metabolic waste.

Circulation Pathway

Blood travels through the body via two main pathways:

  • Systemic Circulation: Carries oxygenated blood from the heart to the body tissues and returns deoxygenated blood to the heart.
  • Pulmonary Circulation: Transports deoxygenated blood from the heart to the lungs for oxygenation and returns oxygenated blood to the heart.


Transport of Respiratory Gases: transportation in organism class

The respiratory system complements the circulatory system by facilitating the exchange of gases. Oxygen is absorbed into the bloodstream from the lungs, while carbon dioxide is expelled from the body.

Overview of Transportation in Plants

Plants utilize specialized structures to transport water, nutrients, and other vital substances from roots to leaves and vice versa.

Vascular Tissues

  1. Xylem: Responsible for transporting water and minerals from roots to shoots through capillary action.
  2. Phloem: Transports organic nutrients, such as sugars and amino acids, produced through photosynthesis, from leaves to other parts of the plant.


Mechanisms of Transport

  1. Transpiration: The process by which water is drawn upward through the plant via evaporation and cohesion-tension.
  2. Root Pressure: Helps in the upward movement of water from roots to stems through osmotic processes.

Comparison between Animal and Plant Transportation Systems ,Class 7th science chapter 11

While both animals and plants have evolved efficient transportation systems, there are notable differences in their mechanisms and structures.

AspectAnimal Transportation SystemPlant Transportation System
Main Transport MediumBloodXylem and Phloem
Role of HeartCentral pump for blood circulationAbsent, no central pump for fluid transport
Transport DirectionBidirectionalUnidirectional (from roots to shoots and vice versa)
Role of Respiratory SystemFacilitates gas exchangeN/A

Conclusion of class 7th science chapter 11

Understanding transportation in animals and plants is crucial for comprehending the intricate workings of living organisms. CBSE Class 7 Science Chapter 11 provides a comprehensive overview of these processes, shedding light on the fascinating mechanisms that enable life to thrive. By grasping these concepts, students gain valuable insights into the interconnectedness of biological systems and the marvels of nature.





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