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The outermost layer found in a plant cell is a cell wall made up of cellulose and lignin that acts as a protective covering and provides mechanical strength to the cell.
Plant cells have a cell wall as well as a cell membrane whereas animal cells have only a cell membrane.

The small units of the body are called cells.

Reptiles are dry skinned and scaly organisms . Exapmles are lizard , snake, calotes etc .
Organisms like frog , salamander, caecilian can live both on land and water . They are called Amphibians .
Mammals are creatures which give birth to young ones and feed milk . eg ; cat , rabbit, cow etc .

Birds	Incubation period
Hen	21 days
Dove	14 days
Sparrow	14 days
Ostrich	42 days
Love birds	22 to 25 days

November 12 is National bird watching day .

Substances like neodymium and samarium are used for making magnets.

The moon completes a revolution around the earth in 27 1/3 days. It takes the same time to complete one rotation as well.

In eye , the inverted image is formed on the screen known as retina .

The optic nerves send this message to the brain . The brain enables the vision of the real erect image .

The retina is a delicate membrane in the eye

This includes these two cells namely rods and cone.

The retina of an eye is just like the film in a camera.

Rods and cones are light sensitive cells which respond to the intensity of light and colour of objects respectively, by generating electrical signals.

The modified stem below the soil are called underground stem . potato is an exapmle of underground stem .

Two substances when mixed together forms a solution . Solvent is present in more quanity and solute in less quantity . eg ; In sugar solution , sugar is the solute and water is the sovent .

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