In plants, cytokinin is present in areas of rapid cell division, such as the shoot apex, root tips, and young fruits. It promotes cell division, growth, and delay of aging in leaves. On the other hand, abscisic acid (ABA) acts as a growth-inhibiting hormone, responsible for inducing dormancy in seedRead more
In plants, cytokinin is present in areas of rapid cell division, such as the shoot apex, root tips, and young fruits. It promotes cell division, growth, and delay of aging in leaves. On the other hand, abscisic acid (ABA) acts as a growth-inhibiting hormone, responsible for inducing dormancy in seeds and buds. It also helps plants withstand stress conditions like drought by closing stomata to reduce water loss. Hence, cytokinin promotes growth, while abscisic acid restricts it.
Sameer is suffering from diabetes mellitus, a disease in which blood sugar levels remain high due to insufficient production or improper utilization of insulin hormone. Insulin, secreted by the β-cells of the islets of Langerhans in the pancreas, helps regulate glucose levels by converting excess suRead more
Sameer is suffering from diabetes mellitus, a disease in which blood sugar levels remain high due to insufficient production or improper utilization of insulin hormone. Insulin, secreted by the β-cells of the islets of Langerhans in the pancreas, helps regulate glucose levels by converting excess sugar into glycogen. Lack of insulin leads to increased glucose in the blood and urine. Reducing sugar intake and regular exercise help maintain healthy blood glucose levels and control the effects of diabetes.
(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.
Which hormone is present in the areas of rapid cell division in a plant and which hormone inhibits the growth?
In plants, cytokinin is present in areas of rapid cell division, such as the shoot apex, root tips, and young fruits. It promotes cell division, growth, and delay of aging in leaves. On the other hand, abscisic acid (ABA) acts as a growth-inhibiting hormone, responsible for inducing dormancy in seedRead more
In plants, cytokinin is present in areas of rapid cell division, such as the shoot apex, root tips, and young fruits. It promotes cell division, growth, and delay of aging in leaves. On the other hand, abscisic acid (ABA) acts as a growth-inhibiting hormone, responsible for inducing dormancy in seeds and buds. It also helps plants withstand stress conditions like drought by closing stomata to reduce water loss. Hence, cytokinin promotes growth, while abscisic acid restricts it.
See lessA doctor has advised Sameer to reduce sugar intake in his diet and do regular exercise after checking his blood test reports. Which disease do you think Sameer is suffering from? Name the hormone responsible for this disease and the organ producing the hormone.
Sameer is suffering from diabetes mellitus, a disease in which blood sugar levels remain high due to insufficient production or improper utilization of insulin hormone. Insulin, secreted by the β-cells of the islets of Langerhans in the pancreas, helps regulate glucose levels by converting excess suRead more
Sameer is suffering from diabetes mellitus, a disease in which blood sugar levels remain high due to insufficient production or improper utilization of insulin hormone. Insulin, secreted by the β-cells of the islets of Langerhans in the pancreas, helps regulate glucose levels by converting excess sugar into glycogen. Lack of insulin leads to increased glucose in the blood and urine. Reducing sugar intake and regular exercise help maintain healthy blood glucose levels and control the effects of diabetes.
See lessGiven 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 less