Multiple Choice QuestionsThe function of surfactant is/are
facilitating lung expansion
maintaining the stable size of the alveoli
to reduce the surface tension on the alveoli
all of the above
Two chief functions of the leaves are
photosynthesis and respiration
photosynthesis and transpiration
transpiration and respiration
respiration and digestion
The organism in which Kreb's cycle does not occur in mitochondria is
yeast
E.coli
Ulothrix
mould
The plant undergoes wilting when
xylem is blocked
cambium is blocked
phloem is blocked
some roots are reduced in number
A.
xylem is blocked
Wilting The condition that arises in plants when more water is lost by evaporation than is absorbed from the soil. This causes the cells to lose their turgor and the plant structure droops. Plants can normally recover from wilting if water is added to the soil, but permanent wilting and possible death can result if the plant does not have access to water for a long period of time. In certain plants wilting is important as a mechanism to avoid overheating: when the leaves droop they are taken out of direct contact with the sun's rays. When the sun sets the plant can begin to transpire at the normal rate and the cells of the leaves regain their turgor.
Xylem is responsible for transport of water. If xylem is blocked, plant will undergo wilting
Lucocytes (WBCs) are considered as true cells because
they possess nucleus
they do not contain haemoglobin
they show great power of movement
they are responsible forphagocytic activity
During muscle contraction
size of 'A' bands remain same
size of 'H' zone becomes smaller
size of 'I' band decreases
diameter of fibre increases
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