Which of the following is true about photosynthesis?
1). it is an exothermic reaction.
2). it is an endothermic reaction.
3). it produces carbon dioxide .
4). it occurs in animal.
To determine which statement is true about photosynthesis, we can go through each option and explain the concept behind photosynthesis.
1). Photosynthesis is an exothermic reaction. This statement is incorrect. An exothermic reaction releases energy in the form of heat. Photosynthesis, on the other hand, is an endothermic reaction, which means it requires energy input in the form of sunlight.
2). Photosynthesis is an endothermic reaction. This statement is true. Endothermic reactions require an input of energy, and photosynthesis specifically requires sunlight as an energy source for the process to occur.
3). Photosynthesis produces carbon dioxide. This statement is incorrect. During photosynthesis, carbon dioxide is actually absorbed from the environment, not produced, and it is then converted into glucose.
4). Photosynthesis occurs in animals. This statement is incorrect. Photosynthesis is a process that occurs in plants, algae, cyanobacteria, and other photosynthetic organisms. Animals, including humans, cannot carry out photosynthesis as they lack the necessary cellular structures, such as chloroplasts.
Therefore, the correct statement about photosynthesis is: "Photosynthesis is an endothermic reaction."