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.
| 501. |
Both brain and spinal cord are wrapped by |
| A. | single layer of membrane |
| B. | double layer of membranes |
| C. | tripple layer of membranes |
| D. | four layer of membranes |
| Answer» D. four layer of membranes | |
| 502. |
For every two K+ ions that are actively transported inward into neuron, |
| A. | three Na+ are pumped out |
| B. | one Na+ is pumped out |
| C. | two Na+ are pumped out |
| D. | four Na+ are pumped out |
| Answer» B. one Na+ is pumped out | |
| 503. |
Major constituent of control birth pill is |
| A. | oestrogen |
| B. | progesterone |
| C. | androgen |
| D. | testosterone |
| Answer» C. androgen | |
| 504. |
Quick response is produced by the |
| A. | nervous control |
| B. | hormonal control |
| C. | muscular control |
| D. | digestive control |
| Answer» B. hormonal control | |
| 505. |
Main transmitter for synapses that lie outside central nervous system is |
| A. | serotonin |
| B. | adrenaline |
| C. | acetylcholine |
| D. | dopamine |
| Answer» D. dopamine | |
| 506. |
When an impulse reaches a synaptic knob, synaptic vesicles fuse with the |
| A. | pre-synaptic membrane |
| B. | post-synaptic membrane |
| C. | synaptic cleft |
| D. | neurotransmitters |
| Answer» B. post-synaptic membrane | |
| 507. |
Outer layer of adrenal gland is called |
| A. | adrenal cortex |
| B. | adrenal medulla |
| C. | cortex |
| D. | medulla |
| Answer» B. adrenal medulla | |
| 508. |
Weed killing is done by |
| A. | 2,4 D |
| B. | NAA |
| C. | IAA |
| D. | Ethane |
| Answer» B. NAA | |
| 509. |
Medulla of adrenals produces hormone |
| A. | adrenaline |
| B. | nor-adrenaline |
| C. | cortico-steroids |
| D. | Both a and b |
| Answer» E. | |
| 510. |
Which of the following functions is performed by the sensory neuron? |
| A. | It transfers impulses from the receptor to the effector. |
| B. | It transfers impulses from the effector to the motor neuron. |
| C. | Animalia |
| D. | It transfers impulses from the central nervous system to the receptor. |
| Answer» D. It transfers impulses from the central nervous system to the receptor. | |
| 511. |
Which of the following movements involves the movement of sprouts towards sunlight? |
| A. | Phototropism |
| B. | Geotropism |
| C. | Corals |
| D. | Chemotropism |
| Answer» B. Geotropism | |
| 512. |
Which of these labelled structures and their functions is correctly matched? |
| A. | Control of body movement and postureControl of breathing rate and blood pressurePQ |
| B. | Control of body movement and postureControl of breathing rate and blood pressureQS |
| C. | Azadiracta indica |
| D. | Control of body movement and postureControl of breathing rate and blood pressureRQ |
| Answer» D. Control of body movement and postureControl of breathing rate and blood pressureRQ | |
| 513. |
Which of the following movements involves the opening and closing of flowers? |
| A. | Nastic movement |
| B. | Tropic movement |
| C. | (a)-(iii), (b)-(ii), (c)-(vi), (d)-(i), (e)-(v), (f)-(iv) |
| D. | Autonomic movement |
| Answer» B. Tropic movement | |
| 514. |
Which of the following statement are true about endocrine glands?(i) They are ductless glands.(ii) They secrete h ormones directly into the blood(iii) Examples are mammary glands and salivary glands. |
| A. | Only (i) and (ii) |
| B. | Only (i) and (iii) |
| C. | Spongilla has special collared cells called choanocytes, not found in the remaining three. |
| D. | All the three |
| Answer» B. Only (i) and (iii) | |
| 515. |
Which of the following hormones causes the shedding of leaves and fruits? |
| A. | Indole acetic acid |
| B. | Naphthalene acetic acid |
| C. | (a)-(i), (b)-(v), (c)-(iii), (d)-(ii), (e)-(iv) |
| D. | Abscisic acid |
| Answer» E. | |
| 516. |
Various activities and functions in the human body is/are controlled and coordinated by which of the following organ systems?(i) Circulatory system(ii) Respiratory system(iii) Nervous system(iv) Endocrine system |
| A. | Only (i) and (ii) |
| B. | Only (iii) and (iv) |
| C. | Virus |
| D. | All the four |
| Answer» C. Virus | |
| 517. |
Which of the following is/are the characteristic features of reflex action? |
| A. | It is a fast response. |
| B. | It is an automatic response. |
| C. | Harvesting the Crop. |
| D. | All of these |
| Answer» E. | |