The correct answer to this question will be C.pupil
Iris is the ring of pigmented tissue. It is self adjustable.It varies in color.
The iris contains pupil which is present at the centre of the Iris. Pupil is that part of iris through which the light enters the eye.
The pupil is black in color and variable in size due to the iris movement. Iris opens and closes which makes the pupil change its size. It is the pupil which regulates the amount of light entering the eye.
The correct answer would be c. pupil.
Pupil refers to the adjustable opening present at the center of the iris.
It appears as a black hole present at the center of the eye through which light is passed into the eye.
The iris is muscular and contractile structure present around the pupil.
The pupil regulates or controls the amount of light entering the eye with the help of iris.
Iris through its contractile nature regulates the size of the pupil and thus, it controls the amount the light passing through the eye.
Simply put, it is the black hole in the middle of your eye. If there is a lot of light then it becomes smaller and if there is little light its size increases.
one is through turgidity. this occurs before ground tissue ( collenchyma
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developed to give structural support to the plant as it grows bigger. the xylem
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plant render this support and also maintaining osmotic turgidity of the surrounding