12th class (Fsc) Biology unit 3 MCQs
chapter 3 MCQs 12th Class Biology
Coordination and Control:
1. In living things the behavior activities occur at regular intervals which are called:
a. Birorhythms
b. Diurnal rythms
c. Orcaadian
d. Circannual
2. Galls are growth on a plant that are induced by:
a. Parasites
b. Ticks
c. Fungi
d. Protozons
3. Etiolated plants grow without:
a. O2
b. Water
c. CO2
d. Light
4. Apical dominance in plants occur due to higher concentration of:
a. Ethane
b. Cytokinnis
c. Auxin
d. Gibberellins
5. The plant hormone that inhibit the growth of lateral shoots is:
a. Auxin
b. Cytokine
c. Ethane
d. Gibberellin
6. Promotes closing of stomata under condition of water stress:
a. Gibberellins
b. Ethane
c. Cytokinnis
d. Abscisic acid
7. The plant hormone which inhibits growth and promotes bud dormancy is:
a. Cytokinnis
b. Auxin
c. Abscisic acid
d. Gibberellins
8. Ethane induced flowering in:
a. Pine-apple
b. Banana
c. Orange
d. Rose
9. Selective weed like is:
a. NAA
b. 2-4D
c. IPA
d. IAA
10. The hormone which inhibits root growth is:
a. Cytokinnis
b. Auxins
c. Abscisic acid
d. Gibberellins
11. ……… areindole acetic acid or its variants.
a. Cytokine
b. Auxins
c. Ethene
d. Gibberellins
12. A nerve is a:
a. Bundles of axons or dendrites of neurons
b. Collection of neurons
c. Bundle of axons or dendrites bounded by connective tissue
d. Concentration of dendrites and axons
13. Neuroglia cells provide the neuron with:
a. Locomotion
b. Protection
c. Nutrition
d. Support
14. Nissl’s granules are group of:
a. Ribosomes
b. Mesosomes
c. Chromosomes
d. Lysosomes
15. The process conducting impulses away from the cell body are called:
a. Nissl’sgranulis
b. Dendrites
c. Axon
d. Dendron
16. The structure which respond are called:
a. Receptors
b. Effectors
c. Sense organs
d. Nerves
17. The sensation of pain is produced by:
a. Photoreceptors
b. Chemoreceptors
c. Nociceptors
d. Mechanoreceptors
18. Nociceptors produce sensation of:
a. Smell
b. Touch
c. Pain
d. Warmth and cold
19. How many types of receptors are present in skin?
a. Five
b. Three
c. Two
d. Six
20. Which neurons have long axon?
a. Associative
b. Sensory
c. Cell body
d. Motor
21. Pathway of passage of impulse during reflex action is called:
a. Reflex arc
b. Reflex
c. Membrane potential
d. Stimulus
22. Resting membrane potential of a neuron is:
a. -70mv
b. -50mv
c. -80mv
d. -60mv
23. Microscopic gap between the two neurons is called as:
a. Collapse
b. Synapsis
c. Preapse
d. Synapse
24. Rising membrane potential of a neuron is:
a. -70mv
b. 50mv
c. -80mv
d. -60mv
25. During non-conducting state, the neuron membrane is permeable to efflux of:
a. Ca+
b. K+
c. Cl–
d. Na+