(a) Sperm formation will be adversely affected because it requires a lower temperature than the body temperature. (b) Vas deferens is a passage for transfer of sperms, so sperms will not be transferred further. (c) When prostate and seminal vesicles are not functional, they will not add secretions fRead more
(a) Sperm formation will be adversely affected because it requires a lower temperature than the body temperature.
(b) Vas deferens is a passage for transfer of sperms, so sperms will not be transferred further.
(c) When prostate and seminal vesicles are not functional, they will not add secretions for nourishment and medium for the transport of sperms.
(d) When an egg is not fertilised in a human female, it lives for about one day. Then, the thickened lining of the uterus breaks leading to discharge of blood and mucus along with the unfertilised egg. This is called menstruation.
(e) Nutrition and oxygen will not be provided to the growing embryo affecting its growth, which could have serious implications as well.
(i) Anannya’s answer is incorrect. Three-pin plugs are used to connect electrical appliances having metallic bodies to the earth wire, which provides a low-resistance path for leakage current and prevents electric shock. It does not reduce heating of wires. (ii) A fuse acts as a safety device in domRead more
(i) Anannya’s answer is incorrect. Three-pin plugs are used to connect electrical appliances having metallic bodies to the earth wire, which provides a low-resistance path for leakage current and prevents electric shock. It does not reduce heating of wires.
(ii) A fuse acts as a safety device in domestic circuits. It contains a thin wire that melts and breaks the circuit when the current exceeds the safe limit, thus protecting the wiring and appliances from short circuits and overloads.
The resistance of a conductor is influenced by several factors. It increases with the length of the conductor and decreases with the area of cross-section. It also depends on the nature of the material—metals like copper and aluminium have low resistance, while alloys like nichrome have high resistaRead more
The resistance of a conductor is influenced by several factors. It increases with the length of the conductor and decreases with the area of cross-section. It also depends on the nature of the material—metals like copper and aluminium have low resistance, while alloys like nichrome have high resistance. Temperature also affects resistance; in most metals, resistance increases with rise in temperature. Thus, resistance (R) can be expressed as R = ρ(l/A), where ρ is the resistivity of the material.
According to Joule’s Law of Heating, the heat produced in an electrical circuit depends on measurable quantities—current (I), resistance (R), and time (t). The law states that the heat generated (H) in a conductor is directly proportional to the square of current, resistance of the conductor, and tiRead more
According to Joule’s Law of Heating, the heat produced in an electrical circuit depends on measurable quantities—current (I), resistance (R), and time (t). The law states that the heat generated (H) in a conductor is directly proportional to the square of current, resistance of the conductor, and time for which current passes, represented by H = I²Rt. This explains why thicker wires produce less heat and why excessive current can cause heating or damage in electrical appliances.
There are 50% chances that a girl may be born and 50% chances that a boy may be born. It can be explained as follows: Most human chromosomes have a maternal copy and a paternal copy. We have 22 such chromosomes. One pair of chromosomes called sex chromosomes is odd in not always being a perfect pairRead more
There are 50% chances that a girl may be born and 50% chances that a boy may be born. It can be explained as follows:
Most human chromosomes have a maternal copy and a paternal copy. We have 22 such chromosomes. One pair of chromosomes called sex chromosomes is odd in not always being a perfect pair. Women have a perfect pair of sex chromosomes, both called X. (XX)
But men have a mismatched pair of sex chromosomes in which one is normal sized – X chromosome while the other is a short one called Y chromosome. (XY)
A child receives one chromosome from mother which is essentially X chromosome. A child who inherits an X chromosome from her father will be a girl, and one who inherits a Y chromosome from him will be a boy.
Given below are certain situations. Analyze and describe its possible impact on a person: a) Testes of a male boy are not able to descend into scrotum during his embryonic development. b) Vas deferens of a man is plugged. c) Prostate and seminal vesicles are not functional. d) Egg is not fertilised in a human female. e) Placenta does not attach to the uterus optimally.
(a) Sperm formation will be adversely affected because it requires a lower temperature than the body temperature. (b) Vas deferens is a passage for transfer of sperms, so sperms will not be transferred further. (c) When prostate and seminal vesicles are not functional, they will not add secretions fRead more
(a) Sperm formation will be adversely affected because it requires a lower temperature than the body temperature.
(b) Vas deferens is a passage for transfer of sperms, so sperms will not be transferred further.
(c) When prostate and seminal vesicles are not functional, they will not add secretions for nourishment and medium for the transport of sperms.
(d) When an egg is not fertilised in a human female, it lives for about one day. Then, the thickened lining of the uterus breaks leading to discharge of blood and mucus along with the unfertilised egg. This is called menstruation.
(e) Nutrition and oxygen will not be provided to the growing embryo affecting its growth, which could have serious implications as well.
See lessAnannya responded to the question: Why do electrical appliances with metallic bodies are connected to the mains through a three pin plug, whereas an electric bulb can be connected with a two pin plug? She wrote: Three pin connections reduce heating of connecting wires. (i) Is her answer correct or incorrect? Justify. (ii) What is the function of a fuse in a domestic circuit?
(i) Anannya’s answer is incorrect. Three-pin plugs are used to connect electrical appliances having metallic bodies to the earth wire, which provides a low-resistance path for leakage current and prevents electric shock. It does not reduce heating of wires. (ii) A fuse acts as a safety device in domRead more
(i) Anannya’s answer is incorrect. Three-pin plugs are used to connect electrical appliances having metallic bodies to the earth wire, which provides a low-resistance path for leakage current and prevents electric shock. It does not reduce heating of wires.
See less(ii) A fuse acts as a safety device in domestic circuits. It contains a thin wire that melts and breaks the circuit when the current exceeds the safe limit, thus protecting the wiring and appliances from short circuits and overloads.
List the factors on which the resistance of a conductor depends.
The resistance of a conductor is influenced by several factors. It increases with the length of the conductor and decreases with the area of cross-section. It also depends on the nature of the material—metals like copper and aluminium have low resistance, while alloys like nichrome have high resistaRead more
The resistance of a conductor is influenced by several factors. It increases with the length of the conductor and decreases with the area of cross-section. It also depends on the nature of the material—metals like copper and aluminium have low resistance, while alloys like nichrome have high resistance. Temperature also affects resistance; in most metals, resistance increases with rise in temperature. Thus, resistance (R) can be expressed as R = ρ(l/A), where ρ is the resistivity of the material.
See lessState the law that explains the heating effect of current with respect to the measurable properties in an electrical circuit.
According to Joule’s Law of Heating, the heat produced in an electrical circuit depends on measurable quantities—current (I), resistance (R), and time (t). The law states that the heat generated (H) in a conductor is directly proportional to the square of current, resistance of the conductor, and tiRead more
According to Joule’s Law of Heating, the heat produced in an electrical circuit depends on measurable quantities—current (I), resistance (R), and time (t). The law states that the heat generated (H) in a conductor is directly proportional to the square of current, resistance of the conductor, and time for which current passes, represented by H = I²Rt. This explains why thicker wires produce less heat and why excessive current can cause heating or damage in electrical appliances.
See lessWhat is the probability of a girl or a boy being born in a family? Justify your answer.
There are 50% chances that a girl may be born and 50% chances that a boy may be born. It can be explained as follows: Most human chromosomes have a maternal copy and a paternal copy. We have 22 such chromosomes. One pair of chromosomes called sex chromosomes is odd in not always being a perfect pairRead more
There are 50% chances that a girl may be born and 50% chances that a boy may be born. It can be explained as follows:
Most human chromosomes have a maternal copy and a paternal copy. We have 22 such chromosomes. One pair of chromosomes called sex chromosomes is odd in not always being a perfect pair. Women have a perfect pair of sex chromosomes, both called X. (XX)
But men have a mismatched pair of sex chromosomes in which one is normal sized – X chromosome while the other is a short one called Y chromosome. (XY)
A child receives one chromosome from mother which is essentially X chromosome. A child who inherits an X chromosome from her father will be a girl, and one who inherits a Y chromosome from him will be a boy.
See less