Biology Ch 3 Class 12 Coordination and Control
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The sense organs of taste in tongue are known as:
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A _____ is a junction between two neurons or between a motor neuron and a muscle cell:
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The prolactin hormone, responsible for the activation of mammary glands to start producing milk, is a hormone of the:
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Type of neurons found exclusively in CNS are:
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In plants, ______ hormone promotes closing of stomata in drought conditions.
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Which body function is controlled through a positive feedback mechanism?
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Four events in the transmission of nerve impulses across synapses are:
I. depolarisation of the presynaptic membrane
II. propagation of postsynaptic action potential
III. reabsorption of the transmitter substance
IV. release of transmitter substance into the synaptic cleft
In which sequence do these events occur?
FIRST -> LAST
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Which type of the receptors are present in the ear?
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Which of the following is antagonist to Auxin in terms of promotion of stem growth?
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The spinal nerves are functionally:
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Which hormone is chemically a steroid?
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Which of the following is not the function of the cerebrum?
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Type of sensations carried by nociceptors are:
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Diameter of an artery can be changed by:
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The gland known as the “gland of emergency” is the:
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Which of the following is used in brewing industry to promote malting:
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Normal resting membrane potential of a neuron is
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The nerve center for sight is located in the
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Na+ -K+ ATPase pump is important for:
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Thyroid gland requires high amount of:
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The phytohormones controlling the plant movements are?
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Resting membrane potential of neurons is _______, while during active membrane potential the inner membrane surface becomes more _____ than the outside.
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The _____ is the main nutritional part and it’s concerned with the biosynthesis of materials necessary for neurons.
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The only promoter of leaf senescence in the following plant hormones is:
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Which type of sensory structures carrying the touch sensations are present in papillae extending into ridges of the fingertips?
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On land, frogs are:
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All of the following hormones are secreted from anterior lobe of pituitary gland BUT:
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Hepatic and Pancreatic secretions are also stimulated by a hormone called:
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Lymph nodes are not present:
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Nissl’s granules are present in which part of the neuron?
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Which one of the following is a neurotransmitter?
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The 1st human hormone produced by recombinant DNA technology was:
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The autonomic nervous system controls all of the following activities except:
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The _____ may be a cell, neuron ending or an organ that receives the stimulus.
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Direction of reflex action is from:
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How many meninges cover the human brain?
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Which type of sensory structures carry deep pressure and vibration sensations?
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Gibberellins may be substituted for _____ light, therefore promote flowering in long day plants.
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Which of the following neurotransmitters function, both as neurotransmitter and hormones, decreasing our perception of pain?
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The estrogen hormone secretion during the oogenesis is stimulated by:
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Which brain portion is responsible for controlling body coordination?
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_________ is sometimes given by injection as an emergency treatment in cardiac arrest:
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Which of the following statement about neuron is incorrect?
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Abscisic acid promotes flowering in short day plants and inhibits in long day plants, which of the following is antagonistic to abscisic acid in terms of flowering:
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At the induction of action potential opening of Na+ gate with influx of Na+ is a _________ processes:
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Normal action potential of a neuronal cell is :
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Which of the following is not secreted by thyroid gland?
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The directional movement toward or away from the stimulus is called:
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Maintenance of normal resting potential via movement of K+ inside the cell and na+ out is a/an _______ process.
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Deficient production of hormones by adrenal glands results in: .
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Chemically auxins are
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The correct option about spinal nerves is:
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Neurons are cells adapted for the rapid transmission of electrical impulses. To do this, they have long thin processes called:
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Which one of the following is common to all neurons?
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Which of the following is the function of adrenaline?
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In an experiment, the production of hormone secretin was blocked. As a result, levels of all of the following enzymes were affected EXCEPT:
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Chlorosis, i.e., yellowish hue on the leaves results from
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Neurotransmitters trigger action potential in the postsynaptic neuron by changing the permeability of certain _________.
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Cell membrane under resting conditions is impermeable to all the ions except
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The region where the impulse moves from one neuron to another is called ______.
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