Answer the following questions briefly :(i) How are the cytons and a

1.	Answer the following questions briefly :(i) How are the cytons and axons placed in the brain and the spinal cord ? (ii) Which part of the human ear gives ‘Dynamic balance’ and ‘Static balance’ to the body ? (iii) 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’.
Answer» (i) In brain, outer portion contains cyton which gives a grayish colour hence called as gray matter, while axon is inside. In spinal cord, cyton’is inside forming gray matter and axon is outside forming white matter. (ii) Dynamic balance – semicircular canal Static balance – utriculus and sacculus (vestibule) (iii) When a person moves from dark lighted area to brightly lighted area, visual purple of rods is bleached reducing their sensitivity and pupil constricts to reduce the amount of light entering eyes. This is light adaptation. When a person moves from brightly lighted area to dark area, visual purple of rods which were earlier broken due to bright light regenerates and pupil dilates to allow more light to enter. This is dark adaptation. (iv) Development of fruit without fertilization, e.g., Apple, banana, tomato. (v) • Eliminate open defecation by constructing community toilets. • Neat and Clean India

Answer the following questions briefly :(i) How are the cytons and axons placed in the brain and the spinal cord ? (ii) Which part of the human ear gives ‘Dynamic balance’ and ‘Static balance’ to the body ? (iii) 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’.

Answer»

(i) In brain, outer portion contains cyton which gives a grayish colour hence called as gray matter, while axon is inside. In spinal cord, cyton’is inside forming gray matter and axon is outside forming white matter.

(ii) Dynamic balance – semicircular canal Static balance – utriculus and sacculus (vestibule)

(iii) When a person moves from dark lighted area to brightly lighted area, visual purple of rods is bleached reducing their sensitivity and pupil constricts to reduce the amount of light entering eyes. This is light adaptation. When a person moves from brightly lighted area to dark area, visual purple of rods which were earlier broken due to bright light regenerates and pupil dilates to allow more light to enter. This is dark adaptation.

(iv) Development of fruit without fertilization, e.g., Apple, banana, tomato.

(v)

• Eliminate open defecation by constructing community toilets.

• Neat and Clean India

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