MCQOPTIONS
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MCQOPTIONS
This section includes 517 Mcqs, each offering curated multiple-choice questions to sharpen your Science knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
Adrenal cortex secretes |
| A. | aldosterone |
| B. | thyroxine |
| C. | testosterone |
| D. | oestrogen |
| Answer» B. thyroxine | |
| 102. |
Stimuli which produce a response and are external are called |
| A. | Exogenous |
| B. | endogenous |
| C. | heterogeneous |
| D. | homogenous |
| Answer» B. endogenous | |
| 103. |
Functional types of neurons are |
| A. | two |
| B. | four |
| C. | three |
| D. | five |
| Answer» D. five | |
| 104. |
In Peripheral nervous system, brain gives off |
| A. | spinal cord |
| B. | cranial nerves |
| C. | dendrites |
| D. | dendrites |
| Answer» C. dendrites | |
| 105. |
Auxins tend to inhibit |
| A. | fruit growth |
| B. | parthenocarpy |
| C. | abscission |
| D. | bud initiation |
| Answer» D. bud initiation | |
| 106. |
Ervin bunning proved innate nature of 24 hr. rhythm in |
| A. | drosophila |
| B. | rats |
| C. | pisum sativum |
| D. | fungi |
| Answer» B. rats | |
| 107. |
Neurotransmitter molecules after being released bind to the |
| A. | receptors on the pre-synaptic membrane |
| B. | receptors on the post-synaptic membrane |
| C. | receptors in the synaptic cleft |
| D. | receptors in the cell body |
| Answer» C. receptors in the synaptic cleft | |
| 108. |
Adrenal medulla produces adrenaline upon receiving nerve impulses from |
| A. | Brain |
| B. | kidney |
| C. | spinal cord |
| D. | adrenal glands |
| Answer» D. adrenal glands | |
| 109. |
Predictable reaction is known as |
| A. | stimulus |
| B. | phyla |
| C. | Animalia |
| D. | stimuli |
| Answer» B. phyla | |
| 110. |
Mesenteric artery provides blood to |
| A. | liver |
| B. | intestines |
| C. | kidneys |
| D. | hind limbs |
| Answer» C. kidneys | |
| 111. |
System in animals which possess glands that secrete hormones is known as |
| A. | exocrine system |
| B. | circulatory system |
| C. | digestive system |
| D. | endocrine system |
| Answer» E. | |
| 112. |
Onset of parkinson's disease is usually in |
| A. | 20's and 30's |
| B. | 30's and 40's |
| C. | 40's and 50's |
| D. | 50's and 60's |
| Answer» E. | |
| 113. |
Adrenal cortex is active all time but especially during |
| A. | shock |
| B. | stress |
| C. | infection |
| D. | all of the above |
| Answer» E. | |
| 114. |
Blood entering aorta at |
| A. | high pressure |
| B. | high temperatures |
| C. | low pressure |
| D. | low temperature |
| Answer» B. high temperatures | |
| 115. |
Triple layer of membranes covering brain and spinal cord are called |
| A. | meninges |
| B. | pelage |
| C. | pericardium |
| D. | plasma membranes |
| Answer» B. pelage | |
| 116. |
Carbon dioxide (CO₂) concentration is measured in blood through |
| A. | biosensors |
| B. | receptors in lungs |
| C. | receptors in esophagus |
| D. | receptors in blood vessels in neck |
| Answer» E. | |
| 117. |
In veins, the blood pressure is |
| A. | very high |
| B. | high |
| C. | low |
| D. | no pressure at all |
| Answer» D. no pressure at all | |
| 118. |
When the brain is viewed from above in man, the visible part of brain is |
| A. | medulla oblongata |
| B. | Cerebral hemisphere |
| C. | cerebellum |
| D. | pituitary gland |
| Answer» C. cerebellum | |
| 119. |
Thick, muscular and elastic walls are characteristics of |
| A. | endothelium |
| B. | arteries |
| C. | veins |
| D. | capillaries |
| Answer» C. veins | |
| 120. |
Effects of adrenaline on body are |
| A. | short-lived |
| B. | long-term |
| C. | involuntary |
| D. | sudden |
| Answer» B. long-term | |
| 121. |
Collection of responses predetermined by inheritance of specific nerve is |
| A. | learned behaviour |
| B. | innate behaviour |
| C. | habituation |
| D. | imprinting |
| Answer» C. habituation | |
| 122. |
After passing stimulus from receptors to sensory neurons , it then passes to |
| A. | effectors |
| B. | motor neurons |
| C. | associative neurons |
| D. | Back to receptors |
| Answer» D. Back to receptors | |
| 123. |
Follicle stimulating hormone in males stimulates development of germinal epithelium of |
| A. | ovaries |
| B. | kidneys |
| C. | lungs |
| D. | testis |
| Answer» E. | |
| 124. |
Time required to replace one unit of blood is |
| A. | 17 hours |
| B. | 47 hours |
| C. | 72 hours |
| D. | 97 hours |
| Answer» D. 97 hours | |
| 125. |
Axons of dorsal root ganglion |
| A. | end in grey matter of brain |
| B. | end in grey matter of spinal cord |
| C. | become the sensory fibers of spinal nerves |
| D. | become attached to the dorsal root |
| Answer» C. become the sensory fibers of spinal nerves | |
| 126. |
Response to external environment that is beneficial to the organism is termed as |
| A. | sensitivity |
| B. | stability |
| C. | sustenance |
| D. | similarity |
| Answer» C. sustenance | |
| 127. |
Galls are growths on plants induced by |
| A. | other plants |
| B. | pathogens |
| C. | parasites |
| D. | insects |
| Answer» D. insects | |
| 128. |
Sucrose is broken down into glucose (C₆H₁₂O₆) and fructose (C₆H₁₂O₆) through enzyme |
| A. | salivary amylase |
| B. | salicylate |
| C. | sucrose |
| D. | sucral |
| Answer» D. sucral | |
| 129. |
A commercial compound that breaks down to release ethane in plants is known as |
| A. | ethaphon |
| B. | ethnoate |
| C. | ethephon |
| D. | ethyl |
| Answer» D. ethyl | |
| 130. |
In a coordination system, Gonad gland is |
| A. | exocrine gland |
| B. | endocrine gland |
| C. | ectocrine gland |
| D. | duct glands |
| Answer» D. duct glands | |
| 131. |
Pupils are dilated to enhance vision due to the production of |
| A. | Antidiuretic hormone |
| B. | Elastin |
| C. | Adrenaline |
| D. | Myosin |
| Answer» D. Myosin | |
| 132. |
Atria and the ventricles work |
| A. | simultaneously |
| B. | alternately |
| C. | unproportionally |
| D. | proportionally |
| Answer» C. unproportionally | |
| 133. |
In apical, dominance action of auxins is enhanced by |
| A. | ethane |
| B. | oxytocin |
| C. | gibberellin |
| D. | Cytokinins |
| Answer» D. Cytokinins | |
| 134. |
In a human body, arteries |
| A. | carry blood away from body |
| B. | carry blood away from heart |
| C. | bring blood back to body |
| D. | bring blood back to heart |
| Answer» C. bring blood back to body | |
| 135. |
Action potential is triggered in post-synaptic neuron by causing changes in its |
| A. | permeability to lipids |
| B. | permeability to certain ions |
| C. | permeability to proteins |
| D. | permeability to free radicals |
| Answer» C. permeability to proteins | |
| 136. |
In myelinated neurons, impulse jumps from node to node. This is called as |
| A. | synapse |
| B. | transmitter nodes |
| C. | nodes of ranvier |
| D. | nodes of impulse transfer |
| Answer» D. nodes of impulse transfer | |
| 137. |
Veins do not require thick walls |
| A. | as they do not have to work harder |
| B. | they are required only occasionally |
| C. | the blood pressure declines while it gets to veins |
| D. | the blood pressures is immense |
| Answer» D. the blood pressures is immense | |
| 138. |
Preparation and maintenance of body for state of pregnancy is done by |
| A. | oestrogen |
| B. | progesterone |
| C. | oxytocin |
| D. | LH |
| Answer» C. oxytocin | |
| 139. |
Cell death in a brain area that produces dopamine causes |
| A. | epilepsy |
| B. | alzheimer's disease |
| C. | parkinson's disease |
| D. | microcephaly |
| Answer» D. microcephaly | |
| 140. |
Ability to form wing muscles and wings for flight in honey bees is |
| A. | learning behaviour |
| B. | instinctive behaviour |
| C. | habituation |
| D. | imprinting |
| Answer» C. habituation | |
| 141. |
Medulla oblongata narrows down into an oval shaped hollow cylinder called |
| A. | vertebral column |
| B. | spinal cord |
| C. | bone marrow |
| D. | cable |
| Answer» C. bone marrow | |
| 142. |
Nissl's granules are associated with |
| A. | smooth endoplasmic reticulum and golgi bodies |
| B. | lysosomes and golgi bodies |
| C. | mitochondria and golgibodies |
| D. | rough endoplasmic reticulum and golgi apparatus |
| Answer» E. | |
| 143. |
In transportation system of mammals ,Arterioles is |
| A. | fine branches of aorta |
| B. | get divided to form capillaries |
| C. | divide to form venule |
| D. | thick and elastic walled |
| Answer» D. thick and elastic walled | |
| 144. |
Left cerebral hemisphere controls |
| A. | left side of the body |
| B. | right side of the body |
| C. | front side of the body |
| D. | dorsal side of the body |
| Answer» C. front side of the body | |
| 145. |
Receptors which show response to cold and warmth are |
| A. | Thermoreceptors |
| B. | Chemoreceptors |
| C. | Nociceptors |
| D. | Mechanoreceptors |
| Answer» B. Chemoreceptors | |
| 146. |
Oxytocin during childbirth particularly acts on |
| A. | cardiac muscles |
| B. | skeletal muscles |
| C. | smooth muscles |
| D. | circular muscles |
| Answer» D. circular muscles | |
| 147. |
Medulla oblongata is not responsible for |
| A. | heartbeat |
| B. | peristalsis |
| C. | blinking |
| D. | respiratory movements |
| Answer» D. respiratory movements | |
| 148. |
Nerves associated with head, neck and facial regions are |
| A. | spinal nerves |
| B. | cranial nerves |
| C. | mixed nerves |
| D. | motor nerves |
| Answer» C. mixed nerves | |
| 149. |
An intact cell body of a neuron can |
| A. | multiply infinitely |
| B. | regenerate axonal and dendrite fibres |
| C. | cannot regenerate axonal and dendrite fibres |
| D. | never dies |
| Answer» C. cannot regenerate axonal and dendrite fibres | |
| 150. |
Renal artery is a branch of |
| A. | pulmonary arch |
| B. | inferior vena cava |
| C. | dorsal aorta |
| D. | subclavian artery |
| Answer» D. subclavian artery | |