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Lets light enter and pass through a series of clear components and sections, including the cornea, aqueous humor, lens and vitreous humor. Those structures bend and focus light, adjusting how far the light beams travel before they come into focus.
Parts of the eye:
Cornea-
The transparent front layer of the eye that bends light to help focus. It's the first and most powerful lens of the eye.
Pupil-
The black-looking opening that allows light to enter the eye.
Iris-
The colored circular muscle that controls the size of the pupil to let in more or less light.
Lens-
A clear inner part of the eye that works with the cornea to focus light on the retina.
Retina-
A light-sensitive layer of tissue at the back of the eye that contains rods and cones, which are cells that turn light into electrical signals.
Optic nerve-
Carries information from the retina to the brain.
Sclera-
The "white of the eye" that forms part of the supporting wall of the eyeball.
Vitreous humor-
A clear, jelly-like substance that fills the center of the eye and helps it maintain its round shape.
Tears-
Formed by glands around the eye, tears keep the eye moist, nourish the front of the eye, and protect it from injury and infection.

Placentation is the attachment of ovules inside the o***y.
Types of placentation are given in the diagram.

The basic unit of communication in the nervous system is the nerve cell (neuron).
Neurons are unique in their ability to receive and transmit information. It is characterized by the long processes which extend out from the cell body or soma. Dendrites receive afferent signals. Axons carry efferent signals.

Cell Division: Mitosis

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Types of Germination:
Epigeal germination- Epigeal germination means the germination of the plant above the ground i.e. cotyledons lies above the ground.
Hypogeal germination- hypogeal germination means plant germination under the ground i.e. cotyledons lies below the ground.

Lysosome: The Suicidal Bag.
Lysosomes are vesicular structures which contain digestive enzymes. These enzymes are capable of breaking down the foreign particles enter in the cell. Sometimes, the lysosomes cause self-destruction by releasing the digestive enzyme in the cells and thus it is called su***de bags.

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