All Free Psychology MCQs with Answers

• A. Diffused nervous system
• B. Centralized nervous system
• C. Peripheral nervous system
• D. Autonomic nervous system

Explanation: Hydra, jellyfish, and related animals have a diffuse nervous system, also called a nerve net, in which neurons are spread throughout the…

• A. Gonadotrophic hormone
• B. Thyroid stimulating hormone
• C. Somatotropin(STH)
• D. Adrenocorticotrophic hormone

Explanation: Somatotropin, or growth hormone, stimulates bone and body growth; excessive secretion before the growth plates close causes gigantism.

• A. Central nervous system
• B. Peripheral nervous system
• C. Autonomic nervous system
• D. Somatic nervous system

Explanation: The central nervous system, consisting of the brain and spinal cord, interprets incoming information and organizes responses.

• A. Somatotropin(STH)
• B. Thyroid stimulating hormone
• C. Gonadotrophic hormone
• D. All of the above

Explanation: The anterior pituitary secretes growth hormone or somatotropin, thyroid-stimulating hormone, and the gonadotrophins.

• A. Oxytocin
• B. Antidiuretic hormone
• C. Calcitonin
• D. Adrenocorticotrophic hormone

Explanation: Adrenocorticotrophic hormone is released by the anterior pituitary and stimulates the adrenal cortex.

• A. Sodium
• B. Potassium
• C. Organic ions
• D. Inorganic ions

Explanation: Depolarization at the start of a nerve impulse occurs when sodium channels open and membrane permeability to sodium rises.

• A. Threshold potential
• B. Active membrane potential
• C. Resting membrane potential
• D. All of the above

Explanation: A nerve impulse is the action potential produced when the membrane enters its active state, involving rapid depolarization and…

• A. Hydra
• B. Jelly fish
• C. Planaria
• D. Cartilaginous fish

Explanation: Planaria show the early centralization of the nervous system through anterior ganglia and longitudinal nerve cords.

• A. Planaria
• B. Jelly fish
• C. Sea anemone
• D. Coral

Explanation: Planaria possess a superficial neuronal network along with a deeper plexus embedded in the parenchyma.

• A. Anterior pituitary lobe
• B. Posterior pituitary lobe
• C. Median pituitary lobe
• D. None of these

Explanation: The anterior pituitary is traditionally called the master gland because its hormones regulate several other endocrine glands.

• A. Hydra
• B. Planaria
• C. Frog
• D. Man

Explanation: Hydra has a diffuse nerve net in which neurons spread throughout the body without forming a central brain.

• A. Planaria
• B. Mosquito
• C. Toad
• D. Hydra

Explanation: Hydra's nerve net lies between the outer ectoderm and inner endoderm, allowing stimuli to spread through its body.

• A. Mouth
• B. Tentacles
• C. Enteron
• D. Whole body

Explanation: Hydra's tentacles contain sensory and nerve cells and are directly involved in detecting and responding to stimuli, especially contact…

• A. Anterior pituitary lobe
• B. Posterior pituitary lobe
• C. Median pituitary lobe
• D. Hypophysis cerebri

Explanation: Oxytocin and ADH are synthesized in the hypothalamus but transported down axons and stored in the posterior pituitary until release.

• A. Hypophysis cerebri
• B. Pituitary gland
• C. Infundibulum
• D. both a & b

Explanation: Hypophysis cerebri is another anatomical name for the pituitary gland, an ovoid endocrine structure connected to the brain by the…

• A. Thalamus
• B. Hypothalamus
• C. Amygdala
• D. Cerebrum

Explanation: The hypothalamus is a forebrain region that functions as an endocrine control centre and synthesizes oxytocin and ADH.

• A. Thyroxine
• B. epinephrine
• C. Norepinephrine
• D. All of these

Explanation: Thyroxine is derived from tyrosine, while epinephrine and norepinephrine are catecholamines derived from the amino acid tyrosine.

• A. Thyroxine
• B. Epinephrine
• C. Norepinephrine
• D. Vasopressin

Explanation: Vasopressin, also called ADH, is a short polypeptide hormone. Thyroxine and the catecholamines are amino-acid derivatives, not polypeptides.

• A. Cortisone
• B. Vasopressin
• C. Glucagon
• D. Epinephrine

Explanation: Cortisone is derived from cholesterol and has the characteristic steroid structure.

• A. Proteins
• B. Polypeptides
• C. Steroids
• D. All of these

Explanation: Hormones have several chemical forms, including protein or polypeptide hormones and steroid hormones derived from cholesterol.