Biology - Coordination And Control

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Biology Quizzes & Trivia

The control and coordination of human beings take place through the nervous system and hormonal system, which is called endocrine system. A reflex action is an involuntary and nearly instantaneous movement in response to a stimulus. Answer the quiz below and see what you know about these movements. All the best!


Questions and Answers
  • 1. 

    A high concentration of auxin in shoots _______ cell elongation and hence growth.

    Explanation
    A high concentration of auxin in shoots stimulates cell elongation and hence growth. Auxin is a plant hormone that plays a crucial role in regulating cell growth and development. When auxin levels are high, it promotes the elongation of cells, leading to increased growth in the shoots. This stimulation of cell elongation is essential for various processes in plants, such as stem elongation, leaf expansion, and tropisms. Therefore, the presence of a high concentration of auxin in shoots directly stimulates cell elongation and ultimately contributes to overall plant growth.

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  • 2. 

    A high concentration of auxin in roots _______ cell elongation and _________ growth.

    Explanation
    A high concentration of auxin in roots inhibits cell elongation and reduces growth. Auxin is a plant hormone that plays a crucial role in regulating plant growth and development. When auxin levels are high in roots, it inhibits the elongation of cells, preventing them from growing longer. Additionally, it also reduces overall growth, as the inhibition of cell elongation hinders the overall growth of the roots. Therefore, a high concentration of auxin in roots has a negative impact on cell elongation and overall growth.

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  • 3. 

    Animals respond to.... (in an external environment) - 5 things

    • A.

      Light

    • B.

      Temperature

    • C.

      Faeses

    • D.

      Danger

    • E.

      Sound

    • F.

      Blood

    • G.

      Water

    • H.

      Plants

    • I.

      Oxygen levels

    • J.

      Blood glucose levels

    Correct Answer(s)
    A. Light
    B. Temperature
    D. Danger
    E. Sound
    G. Water
    Explanation
    Animals respond to various stimuli in their external environment, including light, temperature, danger, sound, and water. These stimuli play crucial roles in the survival and behavior of animals. Light affects their circadian rhythms, helps them navigate, and regulates their physiological processes. Temperature influences their metabolism, reproduction, and overall activity levels. Danger triggers their fight or flight response, enabling them to escape potential threats. Sound serves as a means of communication and helps animals detect predators or prey. Water is essential for their hydration and overall physiological function. Overall, animals have evolved to respond to these environmental cues to ensure their survival and optimize their chances of finding resources and avoiding danger.

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  • 4. 

    Which of the following in 3rd in the order of nervous response?

    • A.

      Effector

    • B.

      Stimulus

    • C.

      CNS - coordinator

    • D.

      Sensory neurone

    Correct Answer
    D. Sensory neurone
    Explanation
    The correct answer is "Sensory neurone" because in the order of nervous response, the stimulus is first detected by sensory receptors, which then send signals to the sensory neurons. These sensory neurons carry the information to the central nervous system (CNS) where it is processed and coordinated. After the CNS processes the information, it sends signals to the effector, which is the muscle or gland that carries out the appropriate response. Therefore, the sensory neuron is third in the order of nervous response.

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  • 5. 

    a change in your internal or external environment is called a _______

    Correct Answer
    Stimulus
    Explanation
    A change in your internal or external environment is called a stimulus. A stimulus is any event or situation that evokes a response or reaction from an organism. It can be a physical, chemical, or biological change that triggers a sensory response in an individual. Stimuli can come from both within the body (internal) or from the surrounding environment (external). This term is commonly used in the field of psychology and biology to describe the triggers that influence behavior and physiological processes in living organisms.

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  • 6. 

    Digestion is a reflex action.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    Digestion is a reflex action because it is an automatic response that occurs without conscious effort. When we eat, our body automatically initiates a series of physiological processes to break down the food and extract nutrients. These processes, such as the release of digestive enzymes and the contraction of muscles in the digestive tract, are controlled by the autonomic nervous system and occur involuntarily. Therefore, digestion can be considered a reflex action.

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  • 7. 

    Turning to face a loud noise is a reflex action.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    Turning to face a loud noise is not a reflex action. Reflex actions are involuntary responses to stimuli, which occur automatically without conscious thought. While turning to face a loud noise may be a common response, it is not an automatic reflex. It involves a conscious decision to turn and locate the source of the noise.

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  • 8. 

    Your heart beating is a reflex action.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    The statement is true because the beating of the heart is controlled by the autonomic nervous system, which operates involuntarily and regulates bodily functions without conscious effort. The heart's rhythmic contractions occur automatically in response to signals from the brain and other parts of the body, ensuring a continuous flow of blood and oxygen throughout the body. This reflex action allows the heart to adapt to changes in activity levels, emotions, and external conditions to maintain homeostasis.

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  • 9. 

    Blinking is a reflex action.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    Blinking is a reflex action because it is an involuntary response to protect the eyes from potential harm. When something comes near the eyes or there is a sudden change in light, the reflex arc is activated, causing the eyelids to close rapidly. This reflex action helps to keep the eyes moist, clear away debris, and prevent damage to the sensitive cornea.

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  • 10. 

    'Knee jerk' reaction is a nervous response.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    Its is a reflex action.

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  • 11. 

    Order of reflex​ response is...
    1. Stimulus​
    2.  Receptor
    3.  Sensory neurone
    4.  Relay neurone
    5.  Motor neurone
    6.  Effector
    7.  Response - muscles

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    The order of reflex response is as follows: stimulus, receptor, sensory neurone, relay neurone, motor neurone, effector, and response in muscles. This means that when a stimulus is detected by a receptor, it sends a signal through sensory neurons to the relay neurons in the central nervous system. The relay neurons then transmit the signal to motor neurons, which in turn send the signal to effectors (such as muscles) to produce a response. This sequence of events allows for a quick and automatic response to a stimulus without conscious thought.

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  • 12. 

    A high concentration of auxin in shoots _______ cell elongation and hence growth.

    Correct Answer
    stimulates
    Explanation
    A high concentration of auxin in shoots stimulates cell elongation and hence growth. Auxin is a plant hormone that plays a crucial role in promoting cell division and elongation. When there is a high concentration of auxin in the shoots, it activates specific genes and signaling pathways that result in the elongation of cells. This process ultimately leads to the growth of the shoots.

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  • 13. 

    A high concentration of auxin in roots _______ cell elongation and _________ growth.

    Correct Answer
    inhibits
    reduces
    Explanation
    A high concentration of auxin in roots inhibits cell elongation and reduces growth. This is because auxin is a hormone that regulates plant growth and development. In high concentrations, auxin can have a negative effect on cell elongation, causing it to be inhibited. Additionally, high levels of auxin can also suppress overall growth of the plant, leading to a reduction in growth.

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  • 14. 

    Animals respond to.... (in an external environment) - 5 things

    • A.

      Light

    • B.

      Temperature

    • C.

      Faeses

    • D.

      Danger

    • E.

      Sound

    • F.

      Blood

    • G.

      Water

    • H.

      Plants

    • I.

      Oxygen levels

    • J.

      Blood glucose levels

    Correct Answer(s)
    A. Light
    B. Temperature
    D. Danger
    E. Sound
    G. Water
    Explanation
    Animals respond to various stimuli in their external environment in order to survive and adapt. Light is an important stimulus as it helps animals regulate their circadian rhythms and determine day and night cycles. Temperature is another crucial factor as animals need to maintain their body temperature within a certain range for optimal functioning. Danger triggers a response in animals, such as fight or flight, to protect themselves from potential harm. Sound is a stimulus that animals use for communication, mating, and detecting predators or prey. Water is essential for hydration and survival, so animals respond to its presence or absence.

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  • 15. 

    Which of the following in 3rd in the order of nervous response?

    • A.

      Effector

    • B.

      Stimulus

    • C.

      CNS - coordinator

    • D.

      Sensory neurone

    Correct Answer
    D. Sensory neurone
    Explanation
    The correct answer is sensory neurone because in the order of nervous response, the stimulus is first detected by sensory receptors, then transmitted to the central nervous system (CNS) where it is processed and coordinated. After that, the information is sent to the effector, which carries out the appropriate response. Therefore, the sensory neurone is the third step in this sequence.

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  • 16. 

    a change in your internal or external environment is called a _______

    Correct Answer
    Stimulus
    Explanation
    A change in your internal or external environment is called a stimulus. A stimulus can be any event, situation, or condition that elicits a response or reaction from an organism. It can be a physical, chemical, or biological factor that triggers a sensory or behavioral response. Stimuli can vary greatly, ranging from a loud noise or bright light to a change in temperature or the presence of a predator. The response to a stimulus can be immediate or delayed, and it plays a crucial role in an organism's ability to adapt and survive in its environment.

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  • 17. 

    Digestion is a reflex action.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    Digestion is a reflex action because it is an involuntary process that occurs automatically without conscious control. When we eat food, the body automatically initiates a series of physiological processes such as the secretion of digestive enzymes, absorption of nutrients, and elimination of waste. These processes are regulated by the autonomic nervous system, which controls involuntary bodily functions. Therefore, digestion can be considered a reflex action as it is a natural response of the body to the intake of food.

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  • 18. 

    Turning to face a loud noise is a reflex action.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    Turning to face a loud noise is not a reflex action. Reflex actions are involuntary responses to stimuli that occur without conscious thought. While turning to face a loud noise may happen quickly and automatically, it is not a reflex action because it involves a conscious decision to respond to the noise. Reflex actions, on the other hand, are controlled by the spinal cord and do not involve conscious thought or decision-making.

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  • 19. 

    Your heart beating is a reflex action.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    The statement "Your heart beating is a reflex action" is true. The beating of the heart is controlled by the autonomic nervous system, which operates involuntarily and controls reflex actions. The heart beats in response to signals from the brain and various stimuli, such as changes in activity level, emotions, or physical exertion. Therefore, the beating of the heart is considered a reflex action as it occurs automatically without conscious control.

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  • 20. 

    Blinking is a reflex action.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    Blinking is considered a reflex action because it is an involuntary response to protect the eyes from potential harm. When an object or stimulus comes near the eye, the reflex arc is activated, causing the eyelids to close rapidly to prevent any damage or foreign particles from entering the eye. This reflex action occurs without conscious effort or control, making it an automatic response.

    Rate this question:

  • 21. 

    'Knee jerk' reaction is a nervous response.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    Its is a reflex action.

    Rate this question:

  • 22. 

    Order of reflex​ response is...
    1. Stimulus​
    2.  Receptor
    3.  Sensory neurone
    4.  Relay neurone
    5.  Motor neurone
    6.  Effector
    7.  Response - muscles

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    The order of reflex response is as follows: stimulus, receptor, sensory neuron, relay neuron, motor neuron, effector, and response in muscles. This means that when a stimulus is detected by the receptor, it sends a signal through the sensory neuron to the relay neuron, which then relays the signal to the motor neuron. The motor neuron then activates the effector (usually a muscle) to produce a response. This sequence of events allows for a quick and automatic response to a stimulus without conscious thought.

    Rate this question:

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