[Sarandeep Singh]

Human beings have 4 types of teeth present in the upper and lower jaw.

1. incisors- incisors are present at the front of the upper and lower jaw. Four in each jaw. There function is biting of food.

2 Canines- canines are present next to incisors. Two in each jaw. There function is tearing and biting of food. They are sharp in nature.

3. Premolars- Premolars are present next to canines and are broad in nature. There are 4 premolars in each jaw. There function is to chewing and grinding of food.

4 Molars- molars are present next to premolars and are broader in nature. There are 6 molars present in each jaw. There function is similar to premolars i.e. cheming and grinding of food.

[Sarandeep Singh]

The green pigment present in green plants used in the process of photosynthesis for preparation of food by the plants is known as chlorophyll.

Chlorophyll helps to absorb sunlight which is a essential a component needed in the process photosynthesis.

[Sarandeep Singh]

First we will convert all the units in terms on centimetre

actual height of chimney = 12m = 12*100= 1200 cm

actual height of the factory= 28m = 28*100= 2800cm

ratio of height of model chimney to height of actual chimney = 9/1200

= 3/400

height of model factory= ratio of height of model chimney to height of actual chimney* height of actual factory

=3/400*2800

=21cm or 0.21m