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Control and Coordination Test -17

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Control and Coordination Test -17
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  • Question 1
    1 / -0
    From where do the cranial nerves arise?
    Solution
    The cranial nerves are a set of 12 paired nerves that arise directly from the brain. The first two nerves (olfactory and optic) arise from the cerebrum, whereas the remaining ten emerge from the brain stem.
    Hence, the correct option is (A).
  • Question 2
    1 / -0
    Control centre of reflex action is the
    Solution
    Reflex action is extremely quick, automatic, sudden action in response to something in the environment. Example, Immediately pulling back of fingers after touching a hot plate. Receptors receive the message from the external environment. Sensory neuron carries the message from the receptor to the spinal cord. The motor neuron carries the message from the spinal cord to the effector.
    Hence, the correct option is (B).
  • Question 3
    1 / -0
    Which part of a nerve cell contains the nucleus?
    Solution
    The region of the neuron containing the nucleus is known as the cell body, soma, or perikaryon. The cell body is the metabolic center of the neuron.The cell body (soma) is the factory of the neuron. It produces all the proteins for the dendrites, axons, and synaptic terminals and contains specialized organelles such as the mitochondria, Golgi apparatus, endoplasmic reticulum, secretory granules, ribosomes, and polysomes to provide energy and make the parts, as well as a production line to assemble the parts into completed products.
    Hence, the correct option is (B).
  • Question 4
    1 / -0
    Which gland is present on the top of each kidney?
    Solution
    The adrenal glands are small glands located on top of each kidney. They produce hormones that you can't live without, including sex hormones and cortisol. Cortisol helps you respond to stress and has many other important functions.
    Hence, the correct option is (B).
  • Question 5
    1 / -0
    Which of the following plant hormones is usually found in higher concentrations in areas of rapid cell division?
    Solution
    The plant hormones called cytokinins are responsible for promoting and stimulating cell division in plants. Thus, cytokinins would be present in greater concentration in areas where rapid cell division takes place.
    Cytokinin also breaks dormancy in seeds and buds, delays ageing in leaves, promotes fruit growth and stimulates opening of stomata.
    Hence, the correct option is (B).
  • Question 6
    1 / -0
    Which of the following structures is associated with reflex arc?
    Solution
    Spinal cord is associated with reflex arc. A reflex arc is a neural pathway that controls a reflex. In vertebrates, most sensory neurons do not pass directly into the brain, but synapse in the spinal cord. This allows for faster reflex actions to occur by activating spinal motor neurons without the delay of routing signals through the brain. The brain will receive the sensory input while the reflex is being carried out and the analysis of the signal takes place after the reflex action.
    Hence, the correct option is (A).
  • Question 7
    1 / -0
    What is the structural and functional unit of the nervous system?
    Solution
    The nervous system is very complex, nervous tissue consists of just two basic types of nerve cells: neurons and glial cells. Neurons are the structural and functional units of the nervous system.
    They transmit electrical signals, called nerve impulses. Glial cells provide support for neurons. For example, they provide neurons with nutrients and other materials.
    Hence, the correct option is (C).
  • Question 8
    1 / -0
    What helps plant cells to change their shape?
    Solution
    Plant cells change their shape by changing the amount of water in them, resulting in swelling or shrinking.
    Hence, the correct option is (B).
  • Question 9
    1 / -0
    Which of the following plant hormones is gaseous in nature?
    Solution
    Ethylene is the only known gaseous plant hormone. Many plant organs synthesize ethylene, and it moves readily in the air surrounding the tree. Usually, ethylene has an inhibitory effect on plants. It promotes abscission of leaves and fruits, inhibits shoot elongation and favors caliper development, and, along with auxin, inhibits lateral bud development. On the other hand, it can break dormancy in buds and seeds and causes rapid ripening of apples. In apples, ethylene is involved in the transition of fruit from being physiologically mature to ripe. Once exposed to ethylene, their storage life is shortened.
    Hence, the correct option is (B).
  • Question 10
    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 11
    1 / -0
    Wilting of leaves in plants is an effect produced by which of the following?
    Solution
    Witing 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 12
    1 / -0
    The information acquired at the dendritic tip of a nerve cell sets off a chemical reaction. What type of impulses does this chemical reaction create?
    Solution
    At the end of the axon, the electrical impulse sets off the release of some chemicals. These chemicals cross the gap, or synapse, and start a similar electrical impulse in a dendrite of the next neuron. Synapse actually works like a one way valve, as the chemical is present only on one side of the synapse.
    Passing of information takes place by Electric impulse (inside the neuron) and in the form of chemicals (at synapse).
    Hence, the correct option is (B).
  • Question 13
    1 / -0
    What insulate(s) and protect(s) the axon?
    Solution
    The myelin sheath is a protective covering that surrounds fibres called axons, the long thin projections that extend from the main body of a nerve cell or neuron. This sheath is composed of protein and lipids.
    The main function of myelin sheath is to protect and insulate these axons and enhance their transmission of electrical impulses. If myelin is damaged, the transmission of these impulses is slowed down, which is seen in severe neurological conditions such as multiple sclerosis.
    Hence, the correct option is (C).
  • Question 14
    1 / -0
    Hyposecretion of which hormone causes diabetes?
    Solution

    Diabetes is caused, either due to the pancreas not producing enough insulin, or the cells of the body not being able to utilize the insulin produced; as a result of which, the body is unable to use glucose from the blood and it gets accumulated in the blood and is removed from the body through urine. Insulin helps in conversion of glucose into glycogen and lowers the blood glucose level.
    Hence, the correct option is (B).

  • Question 15
    1 / -0
    The connection between central nervous system and other parts of body is facilitated by
    Solution
    The peripheral nervous system is part of the nervous system and consists of the nerves and neurons that reside or extend outside the central nervous system the brain and spinal cord to serve the limbs and organs for example.
    Hence, the correct option is (A).
  • Question 16
    1 / -0
    The term hormone was first introduced by

    Solution
    The term hormone was first introduced by Baylers and Starling. Hormones are your body's chemical messengers. They travel in your bloodstream to tissues or organs. They work slowly, over time, and affect many different processes, including growth and development, metabolism - how your body gets energy from the foods you eat, sexual function, reproduction, mood.
  • Question 17
    1 / -0
    The stimulus of the plant due to certain chemicals is called as
    Solution
    The growth or movement of a plant or any part of the plant in response to a chemical stimulus is called as chemotropism. An example of chemotropism is the growth of a pollen tube down the style during fertilization in response to the presence of sugars in the style.
    Phototropism is one of the many plant tropisms or movements which respond to external stimuli. It is called as positive phototropism when the plant growth is towards a light source.
    Geotropism, which is also known as gravitropism, is characterized by the growth movement by a plant in response to the gravity. It is a general feature of all higher and many lower plants as well as other organisms.
    Therefore, the correct answer is option B.
  • Question 18
    1 / -0
    Example of positive geotropism is:
    Solution
    Positive geotropism is the movement towards the earth. In the case of roots, they grow towards the earth and are thus, called positively geotropic. Whereas shoots are negatively geotropic.
    Thus, the correct answer is option C.
  • Question 19
    1 / -0
    The nervous system is formed of 
    Solution
    The nervous system is a collection of cells, tissues, and organs ( brain, spinal cord, nerves ) through which an organism receives information from its surroundings and then directs the organism to respond to the stimulus.
    So, the correct answer is 'All of the above'.
  • Question 20
    1 / -0
    Reflex arc is a neural pathway that involves .......... nervous system. 
    Solution
    • Reflex arc involves both peripheral and central nervous systems. As the route followed by nerve impulses in the production of a reflex act, is from the peripheral receptor organ, through the afferent nerve, to the central nervous system synapse, and then through the efferent nerve, to the effector organ. 

    Therefore, the correct answer is option D.
  • Question 21
    1 / -0
    Some plants have the ability to twice around objects in response to physical contact is called as
    Solution
    Thigmotropism is a directional movement in which a plant moves or grows in response to touch or contact stimuli. It is found in twiners and tendrils.
    It occurs because  Auxin makes the cells in the tendrils that face away from the support growing longer and stronger. This helps the tendrils to also find the support to grow around. The cells of the tendrils that have contact with the support are devoid of auxin and therefore weaker; this combined process causes the tendrils to coil around the supporting object. Common examples which show thigmotropism: money plant, Ivy plants etc. Hence option C is correct.
  • Question 22
    1 / -0
    The flow of electric pulse from one neuron to another takes place from
    Solution
    The electric pulse in a neuron is received from the dendrite and then passed further. When the pulse reaches the axonal end it has to transfer to another neuron this takes place through the gaps present between the axon of one neuron and dendrite of the next neuron called synapse. Synapse help in the flow of impulses throughout the neuron network. Therefore, the correct answer is option B.
  • Question 23
    1 / -0
    Spinal reflex is located in the ________
    Solution
    • Spinal reflex or withdrawal reflex protects the body from the damaging stimulus. 
    • It is located in the spinal cord. In this reflex pathway, more than one relay neuron connects the sensory and motor neuron.

    Therefore, the correct answer is option D.
  • Question 24
    1 / -0
    Myelin sheath is produced by ______________.
    Solution
    The correct option is C.
    Schwann cells makes myelin in the peripheral nervous system (PNS: nerves) and oligodendrocytes in the central nervous system (CNS: brain and spinal cord). In the PNS, one Schwann cell forms a single myelin sheath.
  • Question 25
    1 / -0
    Irritability/Reactivity/Sensitivity of a plant is
    Solution
    Irritability, reactivity and sensitivity are excitatory response shown by plants to respond to changes in their environment. The most common response shown by plants is movement in response to environment change. For example, closing of leaves of Mimosa pudica on touching or closing of traps on a Venus fly trap.
    Thus, the correct answer is option B. 
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