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Control and Coordination Test -18

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Control and Coordination Test -18
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  • Question 1
    1 / -0
    Mr. X is a renowned tea-taster. Which of the following receptors make him proficient in his occupation?
    Solution
    Mr. X is a renowned tea-taster. Gustatory receptors make him proficient in his occupation.Gustatory receptors are present on the tongue are spread evenly across the taste buds. Their main function is to provide a sense of taste.
    Hence, the correct option is (D).
  • Question 2
    1 / -0
    Adrenaline enables an animal body to deal with stress. Which of the following is not increased by this hormone?
    Solution
    Adrenaline is a Emergency hormone in animals. Blood supply to digestive tract is not increased by this hormone.
    Adrenaline hormone is secreted by adrenal gland and also called 'hormones of Fight or Flight'. It prepares the body to face emergency conditions of physical stress like danger, anger, excitement; etc. It is secreted in small amounts all the time but in large amounts when a person is frightened. The target organ is heart so heart beat increases, resulting in supply of more oxygen in our muscles. It allows more supply of glucose into the blood to give us a lot of energy quickly to fight or flight from the frightening situation.
    Hence, the correct option is (D).
  • Question 3
    1 / -0
    When a dendritic tip of the nerve cell acquires information from any stimuli, then the electric impulses are created by
    Solution
    The nervous tissue is made up of an organised network of neurons and is specialised for conducting information via electrical impulse from one part of the body to another.
    The information acquired at the end of the dendritic tip of the nerve cells, sets off a chemical reaction that creates an electrical impulse. This impulse travels from the dendrite to the cell body and then along the axon to its end. At the end of the axon the electrical impulse sets off the release of some chemicals.
    Hence, the correct option is (B).
  • Question 4
    1 / -0
    Which of the following plant hormones is usually found in higher concentrations in areas of rapid cell division?
    Solution
    Cytokinin is present in higer concentration in the areas of rapid cell division.
    Cytokinins promote cell division. They are produced in growing areas, such as meristems at tip of the shoot. Zeatin is a hormone in this class, and occurs in corn (Zea ).
    Hence, the correct option is (B).
  • Question 5
    1 / -0
    Medulla of the brain is primarily involved in
    Solution
    The part of the brain responsible for this salivary reflex is the medulla oblongata which controls a variety of functions from sneezing to vomiting. On receiving these stimuli, the medulla oblongata sends neurotransmitters to the glands to produce the saliva.
    Hence, the correct option is (D).
  • Question 6
    1 / -0
    In a nerve cell, the organelle involved in the synthesis of ribosomes is
    Solution
    In a nerve cell, the organelle involved in the synthesis of ribosomes is nucleolus.
    The nucleolus is a condensed region of chromatin where ribosome synthesis occurs. Ribosomes, large complexes of protein and ribonucleic acid (RNA), are the cellular organelles responsible for protein synthesis.
    Hence, the correct option is (C).
  • Question 7
    1 / -0
    Which of the following movements is associated with growth?
    Solution
    Germination of seed is associated with growth. Germination is the process by which an organism grows from a seed or similar structure. The term is applied to the sprouting of a seedling from a seed of an angiosperm or gymnosperm, the growth of a sporeling from a spore, such as the spores of fungi, ferns, bacteria, and the growth of the pollen tube from the pollen grain of a seed plant.
    Hence, the correct option is (C).
  • Question 8
    1 / -0
    Wilting of leaves in plants is an effect produced by which of the following?
    Solution
    Wilting occurs in plants such as balsam and holy basil. Wilting is an effect of the plant growth-inhibiting hormone, abscisic acid.
    abscisic acid is a naturally occurring compound in plants. It is a sesquiterpenoid (15-carbon) which is partially produced via the mevalonic pathway in chloroplasts and other plastids. Because it is synthesized partially in the chloroplasts, it makes sense that biosynthesis primarily occurs in the leaves.
    Hence, the correct option is (A).
  • Question 9
    1 / -0
    Which of the following parts of the brain will get a signal that trigger one to eat when blood sugar levels are low?
    Solution
    Forebrain is the part of the brain that will get a signal that triggers one to eat when blood sugar levels are low.
    The forebrain is the part of the brain that includes cerebrum, thalamus and hypothalamus. It is involved in many functions, much of which are linked to the cerebrum. For example, intelligence or higher brain power is associated with the cerebrum. The outermost layer of the cerebrum is made up of four lobes frontal, temporal,parietal and occipital. The hearing, smelling and forming memories are functions of the temporal lobe. Vision is controlled by the occipital lobe. At the base of the forebrain-basal ganglia are found which control movement.
    Hence, the correct option is (C).
  • Question 10
    1 / -0
    Slowest plant movements are related to
    Solution
    The plant responds by growth or turgor changes so that parts of the plant bend towards or away from the direction of the stimulus. Tropic movements are of different types in response to differente stimuli. The growth-related movement of plants is quite slow.
    Hence, the correct option is (C).
  • Question 11
    1 / -0
    Growth of pollen tubes towards ovules is basically
    Solution
    Growth of pollen tubes is a directional movement which takes place due to the chemical secretions of the ovule. Therefore, growth of pollen tubes towards ovules is due to chemotropism.
    Chemotropism is the growth of organisms such as bacteria and plants, with the help of a chemical stimulus from outside of the organism or from the organism's part.
    Hence, the correct option is (A).
  • Question 12
    1 / -0
    Gap or synapse is present between
    Solution
    The synapse is the chemical junction between the axon of first neuron and dendrite of second neuron.
    A synapse is the site of transmission of electric nerve impulses between the two nerves or neurons or between a neuron and a gland or muscle cell. This synapse is a structure, that permits a neuron to pass an electrical or chemical signal to another cell or neuron.
    Hence, the correct option is (A).
  • Question 13
    1 / -0
    Which of the following functions will be affected if the forebrain becomes defunct?
    Solution
    The function of thinking will be affected if the forebrain becomes defunct. Stress from negative thinking creates changes in the brain that may affect your likelihood of mental disorders such as anxiety, depression, ADHD, schizophrenia and mood disorders.
    Hence, the correct option is (D).
  • Question 14
    1 / -0
    Some plant cells change shape in order for the movement to happen. They do this by
    Solution
    Plant cells change their shape by changing the amount of water in them, resulting in swelling or shrinking.
    Hence, the correct option is (C).
  • Question 15
    1 / -0
    Control centre of reflex action is the
    Solution
    Reflex action is an immediate involuntary response to a stimulus without the intervention of the brain, controlled by the spinal cord of the central nervous system.
    Hence, the correct option is (B).
  • Question 16
    1 / -0
    You are given a tissue with its potential for differentiation in an artificial culture. Which of the following pairs of hormones would you add to the medium to secure shoots as well as roots?
    Solution
    Auxin is the plant growth hormone that promotes lengthening and coordinates with other growth hormones to regulate growth; it also causes apical dominance. Cytokinin is the plant growth hormone that promotes cell division in shoot apical meristem and differentiation in root apical meristem. It works antagonistically to auxin to balance the growth with development in shoot and root apex. 
    Therefore, the correct answer is option D.
  • Question 17
    1 / -0
    What would happen to the person if cerebellum of his brain is damaged?
    Solution
    • The cerebellum is responsible for controlling and regulating of the motor activities. 
    • When the cerebellum is damaged, this affects the coordination of the motor activities in the affected person. 
    • The person shakes involuntarily and there is difficulty in balancing the body. The person acts clumsily and cannot stand properly. 
    • Thus, the correct answer is option C. 
  • Question 18
    1 / -0
    Which plant hormone is found in greater concentration in fruits and seeds?
    Solution
    • Cytokinin is the plant growth hormone that stimulates cell division. This hormone is produced in the parts of the plants which are continuously involved in the cell division process. 
    • The cytokinins are found in greater proportion or concentration in the fruits, flowers, and seeds during germination. 
    • They are also found in the apical regions of the shoot and roots.
    Thus, the correct answer is option C. 
  • Question 19
    1 / -0
    Thinking part of the brain is located in:
    Solution
    • The forebrain, midbrain and hindbrain make up the three major parts of the brain.
    • The forebrain is responsible for the actions such as hunger, thirst, body temperature and is also responsible for intelligence and memory. 
    • Midbrain is a center for reflex responses to visual, touch, and auditory input.
    • The hindbrain is responsible for the actions of breathing, heart, and blood vessel, swallowing etc.
    • The cerebrum is the main part of the brain that develops thinking. And its present in forebrain.
    Thus, the correct answer is option A. 
  • Question 20
    1 / -0
    The amount of blood supplied to brain per minute is
    Solution
    The amount of blood supplied to the brain per minute i.e cerebral blood flow is 15% of the cardiac output which is 750 ml.
    Hence, the correct option is '750 ml'.
  • Question 21
    1 / -0
    The movement of the sunflower towards the sun is due to:
    Solution
    Phototropism is the growth of a plant in the direction of light. It is one of the many plant tropisms or movements which respond to external stimuli. Thus, the movement of the sunflower towards the sun is due to phototropism.
  • Question 22
    1 / -0
    Growth of pollen tube through the style towards the embryo sac is an example of
    Solution
    • Chemo-tropism is the growth of plants, navigated by chemical stimulus from outside of the organism or organisms part. 
    • The response of the organism or organism part is termed positive if the growth is towards the stimulus or negative if the growth is away from the stimulus

  • Question 23
    1 / -0
    What is hormone?
    Solution
    Correct option: C

    Explanation:
    • Hormone is a chemical messenger. These are non-nutrient chemicals which act as intercellular messengers and are produced in trace amounts.
    • Hormones are produced by endocrine glands and released directly into blood and transported to a distantly located target organ for regulating specific functions.
    • Ex- Insulin, growth hormone (GH), thyroid-stimulating hormone (TSH) and luteinizing hormone (LH).
      Thus, Option C is correct.
  • Question 24
    1 / -0
    The growth of pollen tubes towards ovules is due to 
    Solution

    Chemotropism is the growth of organisms such as bacteria and plants, with the help of a chemical stimulus from outside of the organism or from organism's part. The response of the organism is termed 'positive' if the growth is towards the stimulus or 'negative' if the growth is away from the stimulus. An example of chemotropic movement can be seen during the growth of the pollen tube, where growth is always towards the ovules. Fertilization of flowers by pollen is achieved because the ovary release chemicals that produce a positive chemotropic response from the developing pollen tube. Therefore, the correct answer is option B.

  • Question 25
    1 / -0
    A reflex arc does not involve
    Solution
    A reflex arc is a simple nervous pathway and consists of the sensory receptor, afferent neuron, center, efferent neuron and effector organ. 
    The afferent/sensory neurons transmit the sensory information from sensory receptors to the spinal cord (sensory pathway). The interneurons of spinal cord integrate the incoming information and signal is relayed to motor/efferent neurons.  
    The motor pathway transmits the signal from motor neurons to the effector organs (muscles and glands etc). Thus, reflex arc transmits the information from receptor to effector via the spinal cord. The brain is not the part of the reflex arc. 
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