Step 1: Understanding Chlorophyll's Role
Chlorophyll is the green pigment found in plants, which plays a vital role in the process of photosynthesis. Photosynthesis is the process by which plants convert light energy into chemical energy, producing glucose and oxygen. Chlorophyll absorbs light, mainly from the blue and red parts of the spectrum, and converts it into chemical energy.
Step 2: Why Other Options are Incorrect
- (B) Respiration: Chlorophyll is not involved in respiration, which occurs in the mitochondria of cells.
- (C) Excretion: Chlorophyll is not related to excretion. Excretion refers to the process of eliminating waste products, which is not a function of chlorophyll.
- (D) Transpiration: While chlorophyll is found in plants, transpiration is the process of water movement through plants and evaporation from aerial parts, which is not directly related to chlorophyll.
Thus, the correct answer is (A) for photosynthesis.
Find the unknown frequency if 24 is the median of the following frequency distribution:
\[\begin{array}{|c|c|c|c|c|c|} \hline \text{Class-interval} & 0-10 & 10-20 & 20-30 & 30-40 & 40-50 \\ \hline \text{Frequency} & 5 & 25 & 25 & \text{$p$} & 7 \\ \hline \end{array}\]
Two concentric circles are of radii $8\ \text{cm}$ and $5\ \text{cm}$. Find the length of the chord of the larger circle which touches (is tangent to) the smaller circle.