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Control and Coordination Test -19

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Control and Coordination Test -19
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  • Question 1
    1 / -0
    Ventricles of brain are filled with a fluid called
    Solution
    The ventricles of the brain are a communicating network of cavities filled with cerebrospinal fluid (CSF) and located within the brain parenchyma.
    Hence, the correct option is (D).
  • Question 2
    1 / -0
    The role of myelinated nerve fibres is to
    Solution
    The role of myelinated nerve fibres is to increase the speed of conduction of impulses. Myelin speeds the conduction of nerve impulses by a factor of 10 compared to unmyelinated fibers of the same diameter. Myelin affects the nervous system, and hence the physiological and behavioral capabilities of an organism, in many ways.
    Hence, the correct option is (A).
  • Question 3
    1 / -0
    It is not recommended to hear music above a threshold level as it damages eardrums. Eardrum is also known as:
    Solution
    The tympanic membrane is also called the eardrum. It separates the outer ear from the middle ear. When sound waves reach the tympanic membrane they cause it to vibrate. The vibrations are then transferred to the tiny bones in the middle ear. The middle ear bones then transfer the vibrating signals to the inner ear. The tympanic membrane is made up of a thin connective tissue membrane covered by skin on the outside and mucosa on the internal surface.
    Hence, the correct option is (C).
  • Question 4
    1 / -0
    The regulation of calcium and phosphate is controlled by which of the following glands?
    Solution
    The parathyroid glands are four tiny glands embedded in the thyroid gland, located in the neck. Each gland is about the size of a grain of rice. The parathyroids produce a hormone, called parathyroid hormone (PTH) or parathormone which regulates the blood calcium level and phosphate level. Its major target cell is in the kidney and bone.
    Hence, the correct option is (A).
  • Question 5
    1 / -0
    The stimulus involved in the process of thigmotropism is:
    Solution
    Thigmotropism is the movement or change in orientation of a plant’s growth as a reaction to touch. Thigmotropism is one example of tropism, which is the response of a plant to environmental stimuli by growing towards or away from them. In other words, the reaction can be positive or negative. So, Touch is the stimulus involved in the process of thigmotropism.
    Hence, the correct option is (A).
  • Question 6
    1 / -0
    Which of the following is not an example of reflex action?
    Solution
    Reflex action is an involuntary and nearly instantaneous movement in response to a stimulus. It is a behavior in which a stimulus evokes a response without involving the brain.

    A few examples of reflex action are:
    • When light acts as a stimulus, the pupil of the eye changes in size.
    • Sudden jerky withdrawal of hand or leg when pricked by a pin.
    • Coughing or sneezing, because of irritants in the nasal passages.
    • Knees jerk in response to a blow or someone stamping the leg.
    • The sudden removal of the hand from a sharp object.
    • Sudden blinking when an insect comes very near to the eyes.
    • A typist, typing a letter without looking at the typewriter.
    Hence, the correct option is (D).
  • Question 7
    1 / -0
    Rabia's mother visited an endocrinologist and was advised to take an insulin injection. The reason behind this treatment was
    Solution
    Rabia's' mother visited an endocrinologist and was advised to take an insulin injection. The reason behind this treatment is the high sugar level. Insulin is produced from pancreas, from a specialized cell called beta cells in Islets of Langerhans. It plays a key role in sugar metabolism. Thus, the patient who was advised to take insulin injections might be suffering from high blood sugar level.
    Hence, the correct option is (C).
  • Question 8
    1 / -0
    Ridhima bought some apples, which were left out on the kitchen shelf for a few days. The hormone released by these overripe fruits is:
    Solution
    The hormone released by these overripe fruits is Ethylene. Ethylene is a simple gaseous plant growth regulator (PGR). It is produced in large amounts by tissues undergoing senescence and ripening fruits. It was observed that unripe bananas ripened faster when stored with ripe bananas. Later, the substance promoting the ripening was found to be ethylene. Ethylene is highly effective in fruit ripening as it enhances the respiration rate during the ripening of the fruits.
    Hence, the correct option is (B).
  • Question 9
    1 / -0
    The lobe of pituitary responsible for secreting oxytocin is:
    Solution
    Neurosecretory cells in the hypothalamus release oxytocin (OT) or ADH into the posterior lobe of the pituitary gland. These hormones are stored or released into the blood via the capillary plexus.The posterior pituitary gland does not produce hormones, but rather stores and secretes hormones produced by the hypothalamus. The paraventricular nuclei produce the hormone oxytocin, whereas the supraoptic nuclei produce ADH.
    Hence, the correct option is (B).
  • Question 10
    1 / -0
    Rohan has been detected with deficiency of growth hormone. Due to this, Rohan will be:
    Solution
    Rohan has been detected with deficiency of growth hormone. Due to this, Rohan will be dwarfism. Growth hormone deficiency (GHD), also known as dwarfism or pituitary dwarfism, is a condition caused by insufficient amounts of growth hormone in the body. Children with GHD have abnormally short stature with normal body proportions. GHD can be present at birth (congenital) or develop later (acquired).
    Hence, the correct option is (C).
  • Question 11
    1 / -0
    A short gap in the myelin sheath around a nerve fibre is called: 
    Solution
    Axon of the neuron is surrounded by a sheath called myelin sheath. The gaps (approximately 1 micrometer wide) formed between myelin sheath cells long the axons are called Nodes of Ranvier. It helps in the easy conduction of action potential during saltatory conduction.
    Hence, the correct option is (C).
  • Question 12
    1 / -0
    Which of the following glands is unpaired?
    Solution
    The pituitary gland or hypophysis is an endocrine gland about the size of a pea and weighing 0.5 grams in humans. It is a protrusion at the bottom of the hypothalamus at the base of the brain. It is a gland which is not paired. Whereas adrenal, testes, ovary are glands which are paired.
    Hence, the correct option is (D).
  • Question 13
    1 / -0
    A potted plant is kept in a room. It bends towards the direction of light. This type of movement is known as:
    Solution
    A potted plant is kept in a room. It starts to bend towards the direction of light.This type of movement is known as Phototropism.The phototropism means the ability of the plant to grow directly with the help of the light source.These kinds of plants show the direct response to the light source.
    Hence, the correct option is (B).
  • Question 14
    1 / -0
    Select the miss-matched pair of the hormone and the endocrine gland from the following options.
    Solution
    A. Adrenaline is a hormone produced by the adrenal glands which triggers the body's fight-or-flight response.
    B. Testosterone is a hormone produced by the testes which is responsible for development of male sexual characteristics.
    C. Oestrogen is produced by ovaries which is responsible for development of female sexual characteristics.
    D. Thyroxine is produced by thyroid gland whose function is to stimulate the oxidative metabolism in cells.
    Hence, the correct option is (A).
  • Question 15
    1 / -0
    Which part of brain controls muscular coordination?
    Solution
    The cerebellum, in the back of the brain, controls balance, coordination and fine muscle control (e.g., walking). It also functions to maintain posture and equilibrium.
    Hence, the correct option is (B).
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