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Which of the following is a correct combination of function and part of the brain?
The medulla oblongata, located in the hindbrain, is responsible for regulating involuntary activities like heartbeat, breathing, and blood pressure. It ensures that vital functions continue automatically without conscious control. The cerebrum controls voluntary actions, while pons and midbrain perfRead more
The medulla oblongata, located in the hindbrain, is responsible for regulating involuntary activities like heartbeat, breathing, and blood pressure. It ensures that vital functions continue automatically without conscious control. The cerebrum controls voluntary actions, while pons and midbrain perform other specific functions. Therefore, the correct combination is Blood pressure: Medulla in hindbrain, as this region coordinates and maintains the rhythmic functioning of the heart and lungs, ensuring a steady flow of blood throughout the body. The correct option is (D).
See lessWhich of the following options indicates the products formed after breakdown of the glucose in our muscle cells when there is lack of oxygen?
In the absence of sufficient oxygen, our muscle cells undergo anaerobic respiration. In this process, glucose is partially broken down to form lactic acid and a small amount of energy is released. This lactic acid accumulates in muscles, causing pain and fatigue after heavy exercise. When enough oxyRead more
In the absence of sufficient oxygen, our muscle cells undergo anaerobic respiration. In this process, glucose is partially broken down to form lactic acid and a small amount of energy is released. This lactic acid accumulates in muscles, causing pain and fatigue after heavy exercise. When enough oxygen becomes available, lactic acid is converted back to carbon dioxide and water. Thus, the correct answer is that lactic acid and energy are produced during anaerobic respiration in human muscle cells. The correct option is (B).
See lessSelect 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.
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