Question

19 Explain the processes of aerobic respiration in mitochondria of a cell and anaerobic
respiration in yeast and muscle with the help of word equations.
3
20 In a pea plant, the trait of flowers bearing purple colour (PP) is dominant over white
colour (pp). Explain the inheritance pattern of F1 and F2 generations with the help of a
cross following the rules of inheritance of traits. State the visible characters of F1and F2
progenies.
3
21 Explain giving reasons the bending of the shoot tip of a plant towards light source coming
from one side of the plant.
3
22 It is desired to obtain an erect image of an object, using concave mirror of focal length of
12 cm.
(i) What should be the range of the object distance in the above case?
(ii) Will the image be smaller or larger than the object? Draw a ray diagram to show the
formation of image in this case.
(iii) Where will the image of this object be, if it is placed 24 cm in front of the mirror?
3
23 Suppose your parents have constructed a two room house and you want that in the living
room there should be a provision of one electric bulb, one electric fan, a refrigerator and a
plug point for appliances of power up to 2 kilowatt. Draw a circuit diagram showing
electric fuse and earthing as safety devices.

Answer 1

Answer: 19 when the breakdown of molecule takes place inside mitochondria aerobic respiration takes place and a lot of energy is released       and when the food molecule breaks down in cytoplasm instead of mitochondria anaerobic respiration takes place , which generally occurs in yeast and muscle cells.