Answer the following questions briefly :
(i) How are the cytons and axons placed in the brain and the spinal cord ?
(it) Which part of the human ear gives ‘Dynamic balance’ and ‘Static balance’ to the body ?
(in) Explain how the human eye adapts itself to bright light and dim light.
(iv) What is Parthenocarpy ? Give one example.
(v) Mention any two objectives of ‘Swachh Bharat Abhiyan’.