Biology - Study Mode

[#656] Stem Cell Therapy (SCT) is not useful for the treatment of which one of the following ailments?
Correct Answer

(D) Vision impairment

Explanation

Solution: Stem Cell Therapy (SCT) is not useful for the treatment of Vision impairment.

[#657] Which part of human eye controls the amount of light entering the eye?
Correct Answer

(A) Pupil

Explanation

Solution: When there is bright light, the iris closes the pupil to let in less light. And when there is low light, the iris opens up the pupil to let in more light. Focuses light rays onto the retina.

[#658] What is the distance of distinct vision (DDV) of a normal human eye?
Correct Answer

(B) 25 cm

Explanation

Solution: The minimum distance from the eye at which an object appears to be distinct i.e., a very clear image of the object is formed is called the distance of distinct vision.
This distance is about 25 cm from the eye.

[#659] The outer white part of the eye which is supporting wall of the eyeball is known as
Correct Answer

(B) Sclera

Explanation

Solution: The eye has three main layers. These layers lie flat against each other and form the eyeball. The outer layer of the eyeball is a tough, white, opaque membrane called the sclera (the white of the eye). The slight bulge in the sclera at the front of the eye is a clear, thin, dome-shaped tissue called the cornea.

[#660] Human eye can differentiate between colours due to
Correct Answer

(B) Cones

Explanation

Solution: Normal cones and pigment sensitivity enable an individual to distinguish all the different colours as well as subtle mixtures of hues. This type of normal colour vision is known as trichromacy and relies upon the mutual interaction from the overlapping sensitivity ranges of all three types of photoreceptor cone.