The part represented by which number is responsible for helping the fish change directions?

Q. Select the part of the fish, which helps it change direction while swimming.

Q. The eye can change the focal length of its lens. Which part of the eye is responsible for this? How does the changing focal length help us?

Q. Which among the following is responsible for breathing in fishes?

Q. Which part/parts of a fish help in bringing about movement?

Q. Answer the questions with respect to the given figure.
i) Copy the diagram and name the parts marked(a) to (c).
ii) Which part is responsible for elongation of the stem?
iii) Which part is responsible for secondary growth?
iv) Name the part which is responsible for elongation of internodes.