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In humans, the life processes are controlled and regulated by
(a) reproductive and endocrine systems
(b) respiratory and nervous systems
(c) endocrine and digestive systems
(d) nervous and endocrine systems

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(d) nervous and endocrine system The control and regulation of life processes do not include the reproductive, respiratory, or digestive systems. All processes, including those of the reproductive, respiratory, and digestive systems, are regulated and controlled by the nervous and endocrine systems.

The junction between two neurons is called
(a) cell junction
(b) neuromuscular junction
(c) neural joint
(d) synapse

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(d) synapse A synapse is a structural structure that allows one neuron to transfer an electric signal to an effector cell or following neuron. The junction is therefore between two neurons.

Which of the following endocrine glands is unpaired?
(a) Adrenal
(b) Testes
(c) Pituitary
(d) Ovary

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(c) Pituitary There are two adrenal glands, one on top of each kidney. Males have two testes, which are paired glands that produce hormones used in sex. Females have a paired gland called the ovary that makes female sex hormones. A separate gland located below the brain is called the pituitary. Since it secretes the …

Which of the following endocrine glands is unpaired?
(a) Adrenal
(b) Testes
(c) Pituitary
(d) Ovary Read More »

The hormone which increases the fertility in males is called
(a) oestrogen
(b) testosterone
(c) insulin
(d) growth hormone

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(b) testosterone

A doctor advised a person to take an injection of insulin because
(a) his blood pressure was low
(b) his heart was beating slowly
(c) he was suffering from goitre
(d) his sugar level in blood was high

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(d) his sugar level in blood was high. A person with diabetes will have high blood sugar because their body does not produce sufficient or no insulin hormones at all. To control blood sugar in these patients, insulin injections are given.

Dramatic changes in body features associated with puberty are mainly because of the secretion of
(a) oestrogen from the testes and testosterone from the ovary
(b) estrogen from the adrenal gland and testosterone from the pituitary gland
(c) testosterone from the testes and estrogen from the ovary
(d) testosterone from the thyroid gland and estrogen from the pituitary gland

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(c) testosterone from the testes and estrogen from the ovary These are the sex hormones that begin to show up after puberty and cause the secondary character. Females release oestrogen, whereas males secrete testosterone.

Dwarfism results due to
(a) Excess secretion of thyroxin
(b) Less secretion of growth hormone
(c) Less secretion of adrenaline
(d) Excess secretion of growth hormone

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(b) Less secretion of growth hormone An organism’s overall growth is controlled by growth hormones. Dwarfism results from the lack of growth hormone secretion.

Which statement is not true about thyroxin?
(a) Iron is essential for the synthesis of thyroxin
(b) It regulates carbohydrates, protein and fat metabolism in the body
(c) The thyroid gland requires iodine to synthesise thyroxin
(d) Thyroxin is also called thyroid hormone

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(a) Iron is essential for the synthesis of thyroxin Iron is not essential for the synthesis of thyroxin; hence, statement a) is wrong.

What is the correct direction of flow of electrical impulses?

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Answer :- C An electrical impulse is received to a neuron’s dendrites by the axonal end of another neuron. The electrical impulse then passes through the cell body and axon and arrives at the axonal end.

When a person is suffering from a severe cold, he or she cannot (a) differentiate the taste of an apple from that of an ice cream (b) differentiate the smell of a perfume from that of an agarbatti (c) differentiate red light from green light (d) differentiate a hot object from a cold object

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(b) differentiate the smell of a perfume from that of an agarbatti Olfactory receptors get blocked in the cold, making it difficult to distinguish smell.