Science

Myopia, also known as nearsightedness, is a common eye condition where distant objects appear blurry. It is directly related to the eyes, making option C correct.

An equinox occurs when day and night are approximately equal in length all over the Earth. This happens twice a year, marking the start of spring and autumn.

Saturn is the second largest planet in our solar system after Jupiter. Uranus and Neptune are smaller than Saturn.

The ozone layer in the Earth's stratosphere absorbs most of the Sun's harmful ultraviolet (UV) radiation, protecting living organisms on Earth from its damaging effects.

Alzheimer's disease primarily damages nerve cells (neurons) in the brain, leading to memory loss and cognitive decline. It does not affect spleen or liver cells.

Carbon dioxide is a major greenhouse gas that traps heat in the Earth's atmosphere, contributing significantly to global warming. Oxygen and ozone do not have the same effect on global warming, and 'None of these' is incorrect since carbon dioxide is responsible.

The lens in the human eye is a biconvex lens, which converges light rays to focus images on the retina. Biconcave lenses diverge light and are not found in the human body for vision purposes.

The different seasons occur because the Earth revolves around the Sun while its axis is tilted. This tilt causes varying angles of sunlight during the year, leading to seasons. Option B is incorrect because Earth's rotation on its axis causes day and night, not seasons.

Medicines or chemicals used specifically to kill or control unwanted plants (weeds) are called herbicides. Insecticides target insects, and fungicides target fungi, so they are not correct in this context.

The cornea is the transparent front part of the eye that is commonly transplanted in eye donation to restore vision. Other parts like the retina or iris are not typically used in transplantation.