(a) loss of milk teeth
(b) increase in height
(c) cracking of voice
(d) weight gain
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Dramatic changes of body features associated with puberty are mainly because of secretion of
(c) testosterone from testes and estrogen from ovary
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How are general growth and sexual maturation different from each other?
General growth refers to different types of developmental process in the body like increase in height, weight gain, changes in shape and size of the body but sexual maturation is...
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Discuss how classification systems have undergone several changes over a period of time?
The classification systems have undergone several changes with time. The first attempt of classification was made by Aristotle. He classified plants as herbs, shrubs, and trees. Animals, on the other...
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Write notes on - (a) Adam's apple: (b) Secondary sexual characters: Secondary sexual character in girls:
Answer: (ii) proper diet is needed for the rapid growth taking place in their body. Answer: (i) menstruation starts. Answer: (ii) chapatti, dal, vegetables. Appearance of moustache and beard. Appearance of chest...
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Rearrange the following events of sexual reproduction in the sequence they occur in a flowering plant:
Gametogenesis, Pollination, Fertilisation, Embryogenesis
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The number of boys and girls in a class are in the ratio 7:5.The number of boys is 8 more than the number of girls. What is the total class strength?
Let the no. of girls be 5x No. of boys=7x According to the question 5x+8=7x 7x-5x=8 2x=8 x=8/2 x=4 No. of girls=5*4=20 no. of boys=7*4 or 5*4+8=28 Hence the total strength of the class is 20+28=48
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Melting of wax is a change where a solid changes to liquid state. Give one more such change which you observe in your surroundings.
Melting of ice. (Similar examples of such type may be given)
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Arrange the following statements in the correct order in which they occur during the formation and removal of urine in human beings.
(d) ---> (e) ---> (b) ---> (a) ---> (c)
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“Focuses of currency have undergone several changes since early times”. Elucidate.
Before the introduction of coins, a variety of objects was used as money. (i) For example, since the very early ages, Indians used grains and cattle as money. (ii) Thereafter, cause the...
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In a voltmeter there are 20 divisions between the 0 mark and 0.5 V mark. Calculate the least count of the voltmeter.
Range of voltmeter, VR = 0.5 V Number of divisions in voltmeter, VN = 20 Least count of voltmeter = VR / V N = 0.5 / 20 = 0.025 V
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