Tag: biology

Quizzes (1160) Questions (12174)

Questions Related to biology

Multiple choice biology animal tissue muscle tissue structure of protein muscle tissues

The type of muscle fibre present in the wall of alimentary canal is 

  1. smooth muscle fibre

  2. striped muscle fibre

  3. cardiac muscle fibre

  4. both (a) and (b)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
The wall of the gut or the alimentary canal is made up of smooth muscle fibres. The presence of these muscles makes it an involuntary organ.
So, the correct answer is 'smooth muscle fibre'.
Multiple choice biology animal tissue muscle tissue structure of protein muscle tissues

Which of the following statements is incorrect ?

  1. Smooth muscles are ,found in urinary bladder, alimentary canal and genital

  2. A striated muscle Is a syncylium Le., a multinudeate structure

  3. The cytoplasm of striated muscle is called endoplasm

  4. The plasma membrane and ER of striated muscles are called sarcolemma and sarcoplasmic reticulum respectively
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Smooth muscles are found in the urinary bladder, alimentary canal, and genitals. They are involuntary muscles and have a major role in the transport of substances.
So, the correct answer is ' Smooth muscles are found in urinary bladder, alimentary canal and genital'.
Multiple choice biology animal tissue muscle tissue structure of protein muscle tissues

Which one of the following is correct pairing of a body part and like kind of muscle tissue that moves it ?

  1. Iris Involuntary smooth muscle

  2. Heart wall Involuntary unstriated muscle

  3. Biceps of upper arm smooth muscle fibers

  4. Abdominal wall smooth muscle
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The iris of the eye contains involuntary smooth muscle fibers that control the size of the pupil.

Multiple choice biology animal tissue muscle tissue structure of protein muscle tissues

Select the correct option:

Which one of the following is correct pairing of a body part with the kind of muscle tissue present in it?

  1. Biceps of upper arm- Smooth muscle fibres

  2. Abdominal wall- Voluntary smooth muscle

  3. Iris- Involuntary smooth muscle

  4. Heart wall- Involuntary unstriated muscle
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Involuntary smooth muscles are those muscles that are not under the control of our will and are without any striations (stripes). Iris has involuntary smooth muscle. Biceps of upper arm have  striated muscle fibres and abdominal wall has involuntary smooth muscles. Heart wall has involuntary striated muscle.

Multiple choice biology nervous system of man divisions of nervous system autonomic nervous system the human brain

How many pairs of sympathetic ganglia are present in ANS?

  1. $10$
  2. $12$
  3. $22$
  4. $31$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
  • The autonomic nervous system(ANS) is the part of the nervous system responsible for the control of the bodily functions not consciously directed, such as breathing, the heartbeat, and digestive processes.
  • Sympathetic ganglia deliver information to the body about stress and impending danger and are responsible for the familiar fight-or-flight response.
  • There are usually 22-23 pairs of sympathetic ganglia present in ANS: 3 in the cervical region (cervical ganglia), 11 in the thoracic region (note the presence of the stellate cervicothoracic ganglia), 4 in the lumbar region and 4-5 in the sacral region.
  • So, the correct answer is '22'.
Multiple choice biology nervous system of man divisions of nervous system autonomic nervous system the human brain

Choose the incorrect statement for Autonomic nervous system.

  1. Acts on skeletal muscles

  2. Acts on smooth muscles

  3. Consists of ganglia formed by pre and post ganglionic neurons

  4. Consists of sympathetic and parasympathetic nervous system
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The autonomic nervous system is a division of the peripheral nervous system that supplies smooth muscle and glands, and thus influences the function of internal organs. 

  • The autonomic nervous system has three branches: the sympathetic nervous system, the parasympathetic nervous system and the enteric nervous system.
  • The autonomic nervous system is unique in that it requires a sequential two-neuron efferent pathway; the preganglionic neuron must first synapse onto a postganglionic neuron before innervating the target organ.
  • So, the correct answer is 'Acts on skeletal muscles'.

Multiple choice biology nervous system of man divisions of nervous system autonomic nervous system the human brain

Which of the following integrates Nervous and endocrine system?

  1. Hypothalamus

  2. Pineal gland

  3. Adrenal gland

  4. Thymus
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • The hypothalamus is a small region of the brain. It's located at the base of the brain, near the pituitary gland. 
  • The hypothalamus is the link between the endocrine and nervous systems. The hypothalamus produces releasing and inhibiting hormones, which stop and start the production of other hormones throughout the body.
  • Hence Hypothalamus integrates Nervous and endocrine system.
  • So, the correct answer is 'Hypothalamus'.
Multiple choice biology nervous system of man divisions of nervous system autonomic nervous system the human brain

If a man could learn to stop his heart beat at will, he must have control over his

  1. Central nervous system

  2. Peripheral nervous system

  3. Autonomic nervous system

  4. Cranial nerves
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The central nervous system includes brain and spinal cord. It integrates and stores the sensory information from external and internal sense organs and commands different organs to respond accordingly. This makes option A incorrect. Peripheral nervous system lies outside the central nervous system. It serves to carry the sensory information from external sensory receptors to CNS and motor signals from CNS to skeletal muscles via its somatic division (the voluntary actions). The autonomous division of peripheral nervous system controls the cardiac and smooth muscles and glands, thereby the functioning of internal organs, without our conscious control (the involuntary actions). This makes option B incorrect and option C correct. The 12 pairs of cranial nerves are part of peripheral nervous system and are mostly concerned with head, neck and facial region of the body (vagus nerve X being the part of autonomous division serves as an exception). Option D is incorrect.  Correct answer is C.