Class 10 Science

Chapter 5 Solutions — Life Processes

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Solutions

Overview

Step-by-step NCERT solutions for Life Processes (Chapter 5, CBSE Class 10 Science) — the full working for every question, not just the final answer. You can also read the Life Processes textbook chapter.

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What these solutions cover

All 28 questions in Life Processes are solved in the PDF. Here's what's inside, exercise by exercise:

Introduction

Why is diffusion insufficient to meet the oxygen requirements of multicellular organisms like us?
What criteria do we use to decide whether something is alive?

Autotrophic Nutrition

What are outside raw materials used for by an organism?
What processes would you consider essential for maintaining life?

Heterotrophic Nutrition

What are the differences between autotrophic nutrition and heterotrophic nutrition?
Where do plants get each of the raw materials required for photosynthesis?
What is the role of the acid in our stomach?

Transportation in Human Beings

What are the necessary conditions for autotrophic nutrition and what are its by-products?
What are the differences between aerobic and anaerobic respiration? Name some organisms that use the anaerobic mode of respiration.

Transportation in Plants

What are the components of the transport system in human beings? What are the functions of these components?
Why is it necessary to separate oxygenated and deoxygenated blood in mammals and birds?

Excretion

What are the components of the transport system in plants? How are water and minerals transported in plants?
How is food transported in plants?

Excretion in Humans

Describe the structure and functioning of nephrons.
What is the role of kidneys in the human body? How does an artificial kidney work?

End-of-Chapter Questions

1.
The kidneys in human beings are a part of the system for
- (a) nutrition
- (b) respiration
- (c) excretion
- (d) transportation
2.
The xylem in plants are responsible for
- (a) transport of water
- (b) transport of food
- (c) transport of amino acids
- (d) transport of oxygen
3.
The autotrophic mode of nutrition requires
- (a) carbon dioxide and water
- (b) chlorophyll
- (c) sunlight
- (d) all of the above
4.
The breakdown of pyruvate to give carbon dioxide, water and energy takes place in
- (a) cytoplasm
- (b) mitochondria
- (c) chloroplast
- (d) nucleus
How are fats digested in our bodies? Where does this process take place?
What is the role of saliva in the digestion of food?
What are the necessary conditions for autotrophic nutrition and what are its by-products?
What are the differences between aerobic and anaerobic respiration? Name some organisms that use the anaerobic mode of respiration.
How are the alveoli designed to maximise the exchange of gases?
What would be the consequences of a deficiency of haemoglobin in our bodies?
Describe double circulation in human beings. Why is it necessary?
What are the differences between the transport of materials in xylem and phloem?
Compare the functioning of alveoli in the lungs and nephrons in the kidneys.

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