PPT: Life Processes in Animals | PPTs for Class 7 PDF Download

 Page 1


Life Processes in Animals
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Life Processes in Animals
Introduction
Essential Life Processes
Life processes are essential activities that all living beings perform to 
survive. These include nutrition, respiration, excretion, circulation, 
and reproduction.
Focus Areas
In this chapter, we explore two key life processes4nutrition and 
respiration4in animals, with a detailed focus on how these 
processes occur in humans and vary across different animals.
Nutrition
The chapter explains how animals obtain energy from food through 
digestion. Different animals have adapted their digestive systems 
based on their habitats and diets, leading to variations in how they 
process and utilize nutrients.
Respiration
Additionally, it discusses how animals use oxygen to produce energy 
through respiration. The respiratory systems of animals also vary 
significantly, reflecting their environmental adaptations and 
metabolic needs.
Page 3


Life Processes in Animals
Introduction
Essential Life Processes
Life processes are essential activities that all living beings perform to 
survive. These include nutrition, respiration, excretion, circulation, 
and reproduction.
Focus Areas
In this chapter, we explore two key life processes4nutrition and 
respiration4in animals, with a detailed focus on how these 
processes occur in humans and vary across different animals.
Nutrition
The chapter explains how animals obtain energy from food through 
digestion. Different animals have adapted their digestive systems 
based on their habitats and diets, leading to variations in how they 
process and utilize nutrients.
Respiration
Additionally, it discusses how animals use oxygen to produce energy 
through respiration. The respiratory systems of animals also vary 
significantly, reflecting their environmental adaptations and 
metabolic needs.
Animal Feeding Habits
Food Preferences
Observe your surroundings and pay attention to what different 
animals eat. Animals have different types of food preferences:
Bees and sunbirds drink the nectar from flowers
Infants of humans and many other animals consume their 
mother's milk
Snakes, such as pythons, swallow the animals they hunt
Some aquatic animals filter and eat tiny food particles that 
are floating around them
Energy from Food
Animals, including humans, get energy from food, which is 
necessary for them to perform various life processes. The 
food animals eat contains complex components like 
carbohydrates, proteins, and fats.
These complex components must be broken down into 
simpler forms so that the body can use them. This breaking 
down happens in a long tube called the alimentary canal. The 
process begins in the mouth and ends at the anus.
As the food travels through the canal, digestive juices are 
released at different points to help break it down into simpler 
forms. The simpler food is then absorbed by various parts of 
the alimentary canal and transported throughout the body to 
perform different functions.
Page 4


Life Processes in Animals
Introduction
Essential Life Processes
Life processes are essential activities that all living beings perform to 
survive. These include nutrition, respiration, excretion, circulation, 
and reproduction.
Focus Areas
In this chapter, we explore two key life processes4nutrition and 
respiration4in animals, with a detailed focus on how these 
processes occur in humans and vary across different animals.
Nutrition
The chapter explains how animals obtain energy from food through 
digestion. Different animals have adapted their digestive systems 
based on their habitats and diets, leading to variations in how they 
process and utilize nutrients.
Respiration
Additionally, it discusses how animals use oxygen to produce energy 
through respiration. The respiratory systems of animals also vary 
significantly, reflecting their environmental adaptations and 
metabolic needs.
Animal Feeding Habits
Food Preferences
Observe your surroundings and pay attention to what different 
animals eat. Animals have different types of food preferences:
Bees and sunbirds drink the nectar from flowers
Infants of humans and many other animals consume their 
mother's milk
Snakes, such as pythons, swallow the animals they hunt
Some aquatic animals filter and eat tiny food particles that 
are floating around them
Energy from Food
Animals, including humans, get energy from food, which is 
necessary for them to perform various life processes. The 
food animals eat contains complex components like 
carbohydrates, proteins, and fats.
These complex components must be broken down into 
simpler forms so that the body can use them. This breaking 
down happens in a long tube called the alimentary canal. The 
process begins in the mouth and ends at the anus.
As the food travels through the canal, digestive juices are 
released at different points to help break it down into simpler 
forms. The simpler food is then absorbed by various parts of 
the alimentary canal and transported throughout the body to 
perform different functions.
Nutrition in Animals
Definition
Nutrition is the process 
by which animals obtain 
and use food to gain 
energy and nutrients for 
growth, repair, and 
other functions.
Food Types
Animals eat various 
types of food, such as 
nectar (bees, sunbirds), 
milk (human infants), 
prey (snakes), or tiny 
particles (aquatic 
animals).
Food Components
Food contains complex components like carbohydrates, 
proteins, and fats, which must be broken down into 
simpler forms through digestion for the body to use.
Page 5


Life Processes in Animals
Introduction
Essential Life Processes
Life processes are essential activities that all living beings perform to 
survive. These include nutrition, respiration, excretion, circulation, 
and reproduction.
Focus Areas
In this chapter, we explore two key life processes4nutrition and 
respiration4in animals, with a detailed focus on how these 
processes occur in humans and vary across different animals.
Nutrition
The chapter explains how animals obtain energy from food through 
digestion. Different animals have adapted their digestive systems 
based on their habitats and diets, leading to variations in how they 
process and utilize nutrients.
Respiration
Additionally, it discusses how animals use oxygen to produce energy 
through respiration. The respiratory systems of animals also vary 
significantly, reflecting their environmental adaptations and 
metabolic needs.
Animal Feeding Habits
Food Preferences
Observe your surroundings and pay attention to what different 
animals eat. Animals have different types of food preferences:
Bees and sunbirds drink the nectar from flowers
Infants of humans and many other animals consume their 
mother's milk
Snakes, such as pythons, swallow the animals they hunt
Some aquatic animals filter and eat tiny food particles that 
are floating around them
Energy from Food
Animals, including humans, get energy from food, which is 
necessary for them to perform various life processes. The 
food animals eat contains complex components like 
carbohydrates, proteins, and fats.
These complex components must be broken down into 
simpler forms so that the body can use them. This breaking 
down happens in a long tube called the alimentary canal. The 
process begins in the mouth and ends at the anus.
As the food travels through the canal, digestive juices are 
released at different points to help break it down into simpler 
forms. The simpler food is then absorbed by various parts of 
the alimentary canal and transported throughout the body to 
perform different functions.
Nutrition in Animals
Definition
Nutrition is the process 
by which animals obtain 
and use food to gain 
energy and nutrients for 
growth, repair, and 
other functions.
Food Types
Animals eat various 
types of food, such as 
nectar (bees, sunbirds), 
milk (human infants), 
prey (snakes), or tiny 
particles (aquatic 
animals).
Food Components
Food contains complex components like carbohydrates, 
proteins, and fats, which must be broken down into 
simpler forms through digestion for the body to use.
Digestion in Human Beings
Mouth Cavity
Digestion begins in the mouth, where teeth crush and chew 
food into smaller pieces (mechanical digestion). Saliva, 
secreted by salivary glands, moistens food and contains 
enzymes that break down starch (a carbohydrate) into 
sugar.
Alimentary Canal
Digestion is the process of breaking down complex food 
into simpler substances. It occurs in the alimentary canal, a 
long tube from the mouth to the anus, with help from 
organs like the liver and pancreas.
Journey of Food
The journey of food through the human digestive system 
involves several stages, starting from the mouth cavity.