Option 1 states that both statements are true and Statement II is the correct explanation of Statement I. Let`s dissect each statement to better understand their accuracy.

Statement I: When a piece of brick lying on grass for a number of days is removed, the covered part of the grass appears pale.

This statement is true as when an object, such as a brick, covers a portion of grass for an extended period, it blocks sunlight and prevents that area of grass from receiving necessary light for photosynthesis. Without sunlight, the grass cannot produce enough chlorophyll, resulting in a pale appearance.

Statement II: Synthesis of chlorophyll, which gives green pigment, occurs in the presence of sunlight.

This statement is also true. Chlorophyll, responsible for the green pigment in plants, is synthesized during the process of photosynthesis. Photosynthesis requires sunlight, carbon dioxide, and water to occur. Without sunlight, plants are unable to produce chlorophyll, resulting in a lack of the characteristic green color.

Therefore, both statements are true, and Statement II explains why the covered part of the grass appears pale. Therefore, option 1 is the correct answer.