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Select the group in which all organisms have the same mode of nutrition.
The correct answer is Cuscuta, ticks, lice, leeches, and tapeworm. All these organisms obtain food from other living beings, showing a parasitic mode of nutrition. Parasites absorb nutrients from the host’s body, harming it in the process. Cuscuta sucks nutrients from plants, while ticks, lice, leecRead more
The correct answer is Cuscuta, ticks, lice, leeches, and tapeworm. All these organisms obtain food from other living beings, showing a parasitic mode of nutrition. Parasites absorb nutrients from the host’s body, harming it in the process. Cuscuta sucks nutrients from plants, while ticks, lice, leeches, and tapeworms live on or inside animals to absorb food. Unlike autotrophs, they cannot prepare their own food and depend entirely on their hosts for survival and nourishment. The correct option is (C).
See lessVinita and Ahmed demonstrated a circuit that operates the two headlights and the two sidelights of a car, in their school exhibition. Based on their demonstrated circuit, answer the following questions. (i) State what happens when switch A is connected to a) Position 2 b) Position 3 (ii) Find the potential difference across each lamp when lit. (iii) Calculate the current a) in each 12 Ω lamp when lit. b) In each 4 Ω lamp when lit. OR (iv) Show, with calculations, which type of lamp, 4.0 Ω or 12 Ω, has the higher power.
(i) 12 Ω lamps (only) on. (a) 4 Ω lamps (only) on (ii) 12 V for both sets of lamps and all of them are in parallel. (iii) 12 Ω lamps are on when the wire is connected to position 2. Voltage across both 12 Ω lamps = 12 V. V = IR (Ohm’s law). I = 1A. 4 Ω lamps are on when the wire is connected to posiRead more
(i) 12 Ω lamps (only) on.
(a) 4 Ω lamps (only) on
(ii) 12 V for both sets of lamps and all of them are in parallel.
(iii) 12 Ω lamps are on when the wire is connected to position 2.
Voltage across both 12 Ω lamps = 12 V.
V = IR (Ohm’s law).
I = 1A.
4 Ω lamps are on when the wire is connected to position 3.
Voltage across both 4 Ω lamps = 12 V.
V=IR (Ohm’s law).
I = 3A.
See lessWhich 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.
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