Water absorption in plants can be increased by keeping the potted plants:(a) in the shade(b) in dim light(c) under the fan

Water absorption in plants is primarily influenced by the rate of transpiration, which is the process of water movement through a plant and its evaporation from aerial parts, such as leaves, stems and flowers.

(a) Keeping the potted plants in the shade: This can actually decrease water absorption in plants. In the shade, plants are exposed to less sunlight, which means they photosynthesize less. Photosynthesis is the process by which plants convert light energy into chemical energy. When photosynthesis rates are lower, plants transpire less, and therefore absorb less water.

(b) Keeping the potted plants in dim light: Similar to keeping plants in the shade, keeping them in dim light can also decrease water absorption. Less light means less photosynthesis and therefore less transpiration and water absorption.

(c) Keeping the potted plants under the fan: This can increase water absorption in plants. A fan can increase the rate of transpiration by reducing the amount of water vapor in the air surrounding the plant, making it easier for the plant to release water vapor. As the plant loses water through transpiration, it absorbs more water from the soil to replace the lost water.

So, among the options provided, keeping the potted plants under the fan can increase water absorption in plants.