Give the exact location of the following:
(v) Hydathodes
Hydathodes are preset at the margins of the leaves
Give reasons for the following:
People living in hilly regions usually suffer from simple goitre.
Give reasons for the following:
(ii) Urine is slightly thicker in summer than in winter.
(b) Give reasons for the following:
(iii) Potato cubes when placed in water become firm and increase in size.
Give reasons for the following:
(iv) A matured mammalian erythrocyte lacks nucleus and mitochondria.
Give reasons for the following:
(v) Photosynthesis is considered as a process supporting all life on Earth.
With reference to the functioning of the eye, answer the following questions:
(i) What is power of accommodation of the eye?
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
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 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?