Class 10 Biology



Control & Coordination

Exemplar Problems MCQ III

Which of the following is a correct statement?

  • Nerve impulse travels from dendritic end towards axonal end
  • At the dendritic end electrical impulses bring about the release of some chemicals which generate an electrical impulse at the axonal end of another neuron
  • The chemicals released from the axonal end of one neuron cross the synapse and generate a similar electrical impulse in a dendrite of another neuron
  • A neuron transmits electrical impulses not only to another neuron but also to muscle and gland cells
    Answer: (c) The chemicals released from the axonal end of one neuron cross the synapse and generate a similar electrical impulse in a dendrite of another neuron

Involuntary actions in the body are controlled by

  • Medulla in forebrain
  • Medulla in midbrain
  • Medulla in hindbrain
  • Medulla in spinal cord
    Answer: (c) Medulla in the hindbrain

Which of the following is not an involuntary action?

  • Vomiting
  • Salivation
  • Heart beat
  • Chewing
    Answer: (d) Chewing

When a person is suffering from severe cold, he or she cannot

  • Differentiate the taste of an apple from that of an ice cream
  • Differentiate the smell of a perfume from that of an agarbatti
  • Differentiate red light from green light
  • Differentiate a hot object from a cold object
    Answer: (b) Differentiate the smell of a perfume from that of an agarbatti

What is the correct direction of flow of electrical impulses?

exemplar question options

Which statement is not true about thyroxin?

  • Iron is essential for the synthesis of thyroxin
  • It regulates carbohydrates, protein and fat metabolism in the body
  • Thyroid gland requires iodine to synthesise thyroxin
  • Thyroxin is also called thyroid hormone
    Answer: (a) Iron is essential for the synthesis of thyroxine

Dwarfism results due to

  • Excess secretion of thyroxin
  • Less secretion of growth hormone
  • Less secretion of adrenaline
  • Excess secretion of growth hormone
    Answer: (b) Less secretion of growth hormone

Dramatic changes of body features associated with puberty are mainly because of secretion of

  • Oestrogen from testes and testosterone from ovary
  • Oestrogen from adrenal gland and testosterone from pituitary gland
  • Testosterone from testes and Oestrogen from ovary
  • Testosterone from thyroid gland and Oestrogen from pituitary gland
    Answer: Testosterone from testes and Oestrogen from ovary

A doctor advised a person to take an injection of insulin because

  • His blood pressure was low
  • His heart was beating slowly
  • He was suffering from goiter
  • His sugar level in blood was high
    Answer: (d) His sugar level in blood was high

The hormone which increases the fertility in males is called

  • Oestrogen
  • Testosterone
  • Insulin
  • Growth hormone
    Answer: (b) Testosterone

Which of the following endocrine glands is unpaired?

  • Adrenal
  • Testes
  • Pituitary
  • Ovary
    Answer: (c) Pituitary

Junction between two neurons is called

  • Cell junction
  • Neuro muscular junction
  • Neural joint
  • Synapse
    Answer: (d) Synapse

In humans, the life processes are controlled and regulated by

  • Reproductive and endocrine systems
  • Respiratory and nervous systems
  • Endocrine and digestive systems
  • Nervous and endocrine systems
    Answer: (d) Nervous and endocrine systems