Rachna is an expert gymnast on the balance beam. She has been vigorously practising for the Olympic Games. Lately, she has been experiencing dizziness and losing her balance during the practice sessions.

(a) Which part of the membranous labyrinth is responsible for maintaining the body balance on the beam?

(b) Which type of balance is maintained by the structure mentioned in (a)?

Draw a neat, labelled diagram to show that oxygen is released during photosynthesis.

What are Vestigial organs? Give one example of a vestigial structure in the human mouth.

Ahmed had a severe throat infection. After a few days he developed an earache too. What could be the reason for the pain in his ears? Explain.