Due to the black color in the compartments of the solar cooker:

Concept:

Solar cooker:

• A solar cooker is an appliance that uses the energy of the sun's rays to cook food.

Explanation:

The absorption capacity increases:

• Food is cooked in a solar cooker by absorbing heat from the sun.
• A good heat absorber is a black colour.
• Therefore, if the solar cooker is painted black, it may collect more heat energy while simultaneously keeping the heat from escaping to the outside. 
• The effectiveness of a solar cooker can be increased by trapping more heat inside its dark surfaces, which are efficient radiation absorbers. 
• The heat within the cooker subsequently increases quickly.
• The cooking will go more smoothly as a result.

Thus, due to the black colour in the compartments of the solar cooker, the absorption capacity is increased.