Name the part which contains mitochondria and carries out respiration.
24. What happens if
(a) The fertilization of ovum occurs.
(b) The fertilization does not occur.
25. With the help of a figure showing an oscillating simple pendulum, explain the terms
amplitude and oscillation.
26. Man A has a defect of vision due to which he cannot see the nearby objects clearly
though he can see the distant objects clearly. On the other hand, man B has a defect of
vision due to which he cannot see the distant objects clearly though he can see the
nearby objects clearly. The defect in man A can be corrected by using spectacles
containing lens C whereas the defect in man B can be corrected by using spectacles
containing lens D.
(a) Name the defect of vision in man A and B.
(b) What type of lenses are C anand D
a challenge for all
Answers
23. Mitochondria, organelles specialized to carry out aerobic respiration, contain an inner membrane folded into cristae, which form two separate compartments: the inner membrane space and the matrix. The Krebs Cycle takes place in the matrix
24. a) Fertilization happens when a sperm cell successfully meets an egg cell in the fallopian tube. Once fertilization takes place, this newly fertilized cell is called a zygote. From here, the zygote will move down the fallopian tube and into the uterus. The zygote then burrows into the uterus lining.
b) If fertilization does not occur, the ovum disintegrates and is destroyed by the tube. Sperm will remain viable in the female reproductive tract for about 48 hours, although this can be quite variable.
25. Oscillation - one complete to and fro motion of the bob of pendulum. (ii) Amplitude - It is the maximum displacement of the bob from its mean position on either side. (iii) Frequency - It is the number of oscillations made in one second.
26. a) A. hypermetropia
B. Myopia
b) C convex Glasses.
D. Concave Glasses.
