A 'hook' activity is the one which makes use of students' existing knowledge and generates interest. Which of the following would be the BEST "hook" for Ms. Saloni to use while introducing the topic of photosynthesis?

Option 1 : What will happen if leaves are removed from plants?

Photosynthesis is a process by which phototrophs convert light energy into chemical energy, which is later used to fuel cellular activities. The chemical energy is stored in the form of sugars, which are created from water and carbon dioxide. 

What will happen if leaves are removed from plants? would be the BEST "hook" for Ms. Saloni to use while introducing the topic of photosynthesis because

• The thinking capacity of the students would be enhanced.
• They will think about the consequences to be faced if there are no leaves on a plant.
• Then slowly they realize the importance of the leaf and its functions.
• Peer discussion will also take place as the question is interesting and thought-provoking.
• Finally, photosynthesis would be introduced through their thought process, not through their textbook.

​Hence What will happen if leaves are removed from plants? would be the BEST "hook" for Ms. Saloni to use while introducing the topic of photosynthesis. 

​On the other hand, all the remaining questions just check the textbook knowledge of the student and the student's knowledge of the textbook itself and the thinking of children will also be decreased as they find the answers in the textbook itself. Hence these questions are not so relevant as a hook activity.