Short Notes on 

Give Scientific Reasons.

Breathing rate increases during vigorous exercising.

Translocation is needed in all higher plants.

The plants are kept in dark before determining the factory essential for photosynthesis.

It is necessary to separate oxygenated blood from the deoxygenated blood in mammals.

Amphibians and reptiles have three chambered heart.

Digestion of food starts in the mouth itself.

Effect of root pressure is important during night.

Human heart has four chambers.

Rate of breathing is faster in aquatic animals.

The walls of the arteries are thick and elastic.

Unwanted and harmful waste products need to be eliminated from the body.


Draw neat and labelled diagram.

Human excretory sytem [Diagram]

Human respiratory system (breathing system) [Diagram]

Vertical section of the human heart. [Diagram]

Digestive glands. Vertical section of kidney, Villi [Diagram]

Human digestive system. [Diagram]

Absorption by roots. [Diagram]


Answer the following in detail.

How are fats digested in the human body?

What would be the consequences of deficiency of haemoglobin in the human body?

How do plants get rid of their excretory products?

Given below are the end products of different reactions involving glucose. Write the reaction number in front of the following:

Explain the process of translocation in plants.

Explain the structure and function of a nephron.

Describe the exchange of gases in aquatic animals.

Describe the mechanism of breathing in human beings.

Herbivores (grass eating) animals need longer small intestine. Carnivores like tigers (meat eating) have shorter small intestine. Which type of food is difficult to digest)?

How are nutrients classified based on their chemical nature ?

How are nutrients classified based on their functions ?

What happens to the food in the large intestine ?

What happens to the food in the mouth ?

What is respiration ? Explain the phases of respiration.

What is respiration ? What are its types ?

Describe the double circulation of blood.

Describe the excretory system in human beings.

Describe the network of tubes (blood vessels) in human body.

Describe the structure of human heart.

Explain how food is digested in the small intestine.