When grass is kept under cover, chlorophyll does not regenerate due to lack of sunlight; rather the existing chlorophyll is destroyed. As a result, in the absence of chlorophyll, the leaves’ color turns yellow due to the effect of carotene.

Chromoplasts are responsible for the different colors of flower petals. They contain pigments like carotenoids, which produce red, yellow, and orange colors. In contrast, chloroplasts, which contain chlorophyll, are primarily involved in photosynthesis and give leaves their green color. Leucoplasts are colorless and store starch, oils, or proteins.

Mitochondria are called the "powerhouse" of the cell because they produce ATP, the cell's primary energy source, through cellular respiration.

Cancer results from abnormal or uncontrolled cell division, often due to mutations that bypass normal regulatory mechanisms.

Cancer is caused by uncontrolled cell division, leading to a rapid increase in the number of cells. This uncontrolled growth can form tumors.

Xanthophyll is a pigment responsible for the yellow color in fruits as they ripen. It becomes more prominent as chlorophyll fades.

Xanthophyll is a pigment that gives fruits a yellow or yellow-green color as they ripen. While chlorophyll is responsible for the green color in unripe fruits, it breaks down during ripening.

Chromoplasts are responsible for the bright colors of flowers and fruits, containing pigments like carotenoids that produce red, yellow, and orange colors.

Neurons are the longest cells in the animal body, with some extending up to several feet in length (e.g., in humans, the sciatic nerve).

Red blood cells (RBCs) do not have a nucleus when mature, allowing more space for hemoglobin. This makes them efficient in oxygen transport.