Tag: control and coordination in living organisms

Questions Related to control and coordination in living organisms

Different type of reflex arc is_____________

zoology control and coordination in living organisms the reflex action reflex action and reflex arc basic reflex action and reflex arc

  1. Somatic Reflex arc

  2. Visceral Reflex arc

  3. Both A and B

  4. None of these

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Correct Option: C
Explanation:

There are two types of reflex arcs namely, autonomic (visceral) reflex arc, affecting inner organs and somatic reflex arc, affecting muscles. 

Therefore, the correct answer is option C.

Which among the following is the correct definition of taxis?

zoology control and coordination in living organisms the reflex action reflex action and reflex arc basic reflex action and reflex arc

  1. The movement of a body towards or away from the stimulus is called taxis

  2. The movement of a body away from the stimulus is called taxis

  3. The movement of a body towards the stimulus is called taxis

  4. None of these

Show answer
Correct Option: A
Explanation:

  • The movement of animals towards or away from the stimulus is called as the taxis. The taxis may be negative or positive. 
  • The movement away from a stimulus is called negative taxis and the movement towards the stimulus is called positive taxis.


Therefore, the correct answer is option A.

Monosynaptic reflex is a _____________

zoology control and coordination in living organisms the reflex action reflex action and reflex arc basic reflex action and reflex arc

  1. Complex reflex arc consisting of two sensory neurons and one motor neuron

  2. Simple reflex arc consisting of two sensory neurons and one motor neuron

  3. Simple reflex arc consisting of one sensory neuron and one motor neuron

  4. Simple reflex arc consisting of one sensory neuron and two motor neurons

Show answer
Correct Option: C
Explanation:

  • A simple reflex arc consists of only one sensory neuron and one motor neuron, hence the name is the monosynaptic reflex. A complex reflex arc or polysynaptic reflex is formed when the sensory neuron influences several motor neurons through intermediate (association) neurons of the spinal cord. Complex reflex arc consisting of two sensory neurons and one motor neuron.


Therefore, the correct answer is option C.

A sleeping cat suddenly gets up and chases a rat. The movement involved is similar to

zoology control and coordination in living organisms the reflex action reflex action and reflex arc basic reflex action and reflex arc

  1. the movement of train on green signal

  2. the movement of the football when kicked by the player

  3. the ringing of alarm when the correct time is reached

  4. the movement of eyelids when something falls into the eye.

Show answer
Correct Option: A
Explanation:

A sleeping cat suddenly gets up and chases a rat. The movement involved is similar to the movement of train on green signal, because it is involuntary action.

So, the correct option is ‘the movement of train on green signal’.

Which of the following is an incorrect pair?

i. Effector organ of somatic reflex- Skeletal muscles
ii. Receptor organ of somatic reflex- Smooth muscles
iii. Effector organ of visceral reflex- Skin
iv. Receptor organ of visceral reflex- Epithelial lining of the gut

zoology control and coordination in living organisms the reflex action reflex action and reflex arc basic reflex action and reflex arc

  1. (i) and (iii)

  2. (ii) and (iii)

  3. All of the above

  4. None of the above

Show answer
Correct Option: B
Explanation:

The somatic reflex arc affects the muscles and the receptor organ is skin whereas, the effector organ is skeletal muscles. The visceral reflex arc affects the internal organs and the receptor organ is epithelial lining of the gut whereas, the effector organ is smooth muscles. 

Therefore, the correct answer is option B.

Which one of the following statements is correct?

biology control and coordination in living organisms feedback mechanism mechanism of hormone action and feedback mechanisms role of hormones in coordination

  1. Endocrine glands regulate neural activity, but not vice versa

  2. Neurons regulate endocrine activity, but not vice versa

  3. Endocrine glands regulate neural activity, and nervous system regulates endocrine glands

  4. Neither hormones control neural activity nor the neurons control endocrine activity

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Correct Option: C
Explanation:

Endocrine system, like the nervous system, is meant for internal communication and regulation of the animal body. These two systems operate in a coordinated way on many occasions. Many important functions of the endocrine system are infact, under the control of nervous system. Therefore, the two systems are often collectively called as neuroendocrine system

Which part of the body produces the Growth Hormone Releasing Factor (GHRF) ?

biology control and coordination in living organisms feedback mechanism mechanism of hormone action and feedback mechanisms role of hormones in coordination

  1. Thyroid Gland

  2. Hypothalamus

  3. Pituitary Gland

  4. Pineal Gland

Show answer
Correct Option: B
Explanation:
Growth hormone–releasing hormone (GHRH), also known as somatocrinin or by several other names in its endogenous forms and as somatorelin (INN) in its pharmaceutical form, is a releasing hormone of growth hormone (GH). It is a 44-amino acid peptide hormone produced in the arcuate nucleus of the hypothalamus.

Which of the following hormone helps the body in extreme conditions?

biology control and coordination in living organisms feedback mechanism mechanism of hormone action and feedback mechanisms role of hormones in coordination

  1. Adrenaline

  2. Cortisone

  3. Thyroxine

  4. Stimulating Hormone

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Correct Option: B
Explanation:

Cortisone secreted by the Peripheral Cortex of the Adrenal Gland helps body during extreme condition such as high or low temperature. It also helps in burns and several infections.

Which part of the intestine is connected to the Pancreas?

biology control and coordination in living organisms feedback mechanism mechanism of hormone action and feedback mechanisms role of hormones in coordination

  1. Jejunum

  2. Ilem

  3. Duodenum

  4. Islets of Langerhans

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Correct Option: C
Explanation:

The Pancreas is about 6 inches long and sits across the back of the abdomen, behind the stomach. The head of the pancreas is on the right side of the abdomen and is connected to the duodenum (the first section of the small intestine) through a small tube called the pancreatic duct.

Which cells of the Pancreas helps in conversion of Glycogen to Glucose?

biology control and coordination in living organisms feedback mechanism mechanism of hormone action and feedback mechanisms role of hormones in coordination

  1. Alpha Cells

  2. Beta Cells

  3. Gamma Cells

  4. Delta Cells

Show answer
Correct Option: A
Explanation:
The pancreas releases glucagon, which is produced by Alpha cells of Pancreas, when the concentration of insulin (and indirectly glucose) in the bloodstream falls too low. Glucagon causes the liver to convert stored glycogen into glucose, which is released into the bloodstream.