Biology Class 10

Human Evolution

Evolution can be defined as the formation of more complex organisms from pre-existing simpler organisms over a certain period. It is a slow, but progressive, natural, sequential development


Pollution is the addition of any substance in the environment which contributes to the deterioration or contamination of the environment, making it less favourable for organisms.

The Sense Organs

The sense organs enable us to be aware of the condition of the environment. The two eyes are located in deep sockets called orbits. The upper and lower moveable eyelids protect the front surface of the eyes.

The Excretory System

The filtrate left after reabsorption and tubular secretion is called urine. The urine passes from the collecting duct to the pelvis of the kidneys. From there, it is sent to the urinary bladder through the ureters.

Scroll to Top