With reference to the functioning of the eye, answer the following questions:
(iv) Name the cells of the retina and their respective pigments which get activated (1)
in dark and (2) in light
In the dark the rod cells and their pigment Rhodopsin gets activated.
In the light, the cone cells and their pigment Iodopsin gets activated.
Give reasons for the following:
(iv) A matured mammalian erythrocyte lacks nucleus and mitochondria.
With reference to the human ear, answer the following questions:
(ii) Name the three small bones present in the middle ear. What is the biological term
for them collectively?
Give reasons for the following:
(v) Photosynthesis is considered as a process supporting all life on Earth.
Give reasons for the following:
People living in hilly regions usually suffer from simple goitre.
With reference to the human ear, answer the following questions:
(i) Give the technical term for the structure found in the inner ear.
With reference to the functioning of the eye, answer the following questions:
(i) What is power of accommodation of the eye?
(b) Give reasons for the following:
(iii) Potato cubes when placed in water become firm and increase in size.
