Why is photosynthesis an endothermic reaction?
the heat content (q) of the reaction is negative.
a large amount of energy is released into the surroundings.
a large amount of energy is required to activate the reaction.
the temperature of the surroundings increases.
there is no exchange of energy between the system and the surroundings.

Option (c) is the correct answer.

Explanation:

Photosynthesis is a process in which sunlight, carbon dioxide, and water is used by the plants to make their on food.  

Plants absorb energy in the form of heat from the sunlight and thus produce glucose and oxygen from carbon dioxide and water. This absorbed energy is then used to start various chemical and biochemical reactions in the plants.

Hence, photosynthesis is an endothermic reaction.

Thus, we can conclude that a large amount of energy is required to activate the reaction.

a) the particles of the chair are strongly held together.

all eukaryotic cell have mitochondria : )