21- Enzyme catalase protects the plants cell from:
A. Dehydration
B. Photorespiration
C. Toxic effect of alcohol metabolism
D. Protein loss
View Answer
Answer : B. Photorespiration
Description
22- Which of the following set of characteristics are related to veins?
Valves Wall thickness Diameter
A. Present Thick 7-9 μm
B. Absent Thick 40-50 μm
C. Present Thinner 40-50 μm
D. Absent Thinner 40-50 μm
View Answer
Answer : C. Present Thinner 40-50 μm
Description
23- Which of the following would not be compromised in the absence of lymphatic system?
A. Blood pressure
B. Oxygen carrying capacity of blood
C. Defense mechanism
D. Blood composition
View Answer
Answer : B. Oxygen carrying capacity of blood
Description
24- The presence of which molecules distinguishes blood from interstitial fluid?
A. Large proteins and electrolytes
B. Glucose and RBCs
C. Antibodies and electrolytes
D. RBCs and large proteins
View Answer
Answer : D. RBCs and large proteins
Description
25- Plants growing in saline soil face the problem of dehydration due to:
A. ψw of soil > ψw of root
B. ψs of soil < ψs of root
C. ψw of root > ψw of soil
D. ψw of root = ψw of soil
View Answer
Answer : C. ψw of root > ψw of soil
Description
26- During Covid-19 epidemic, the plasma of recovered patients was injected in covid patients. This proved quite effective. Which component of plasma do you think was responsible for this:
A. Plasminogen
B. Interferons
C. Antibodies
D. Interleukin
View Answer
Answer : C. Antibodies
Description
27- Choose the one which is example of artificial active immunity:
A. Fetus receiving antibodies of mother through placenta
B. Mother receiving antibodies
C. Baby receiving MMR shots
D. Prevention of a decease due to previous infection
View Answer
Answer : C. Baby receiving MMR shots
Description
28- Which of the following type of T cells are required for the activation of B cells?
A. Helper T cells
B. Cytotoxic/T cells
C. Suppresser T cells
D. Memory T cells
View Answer
Answer : A. Helper T cells
Description
29- What is the fate of a neurotransmitter after the transmission of nerve impulse across synapse?
A. It is taken into post synaptic neuron
B. Remains bound to post synaptic membrane
C. Remains stray in the synaptic cleft
D. Broken down by enzymes
View Answer
Answer : D. Broken down by enzymes
Description
30- Which immediate change is brought about in the post synaptic membrane on binding with excitatory neurotransmitter?
A. Calcium gates open
B. Sodium gates open
C. Sodium gates close
D. Sodium potassium pump ceases to work
View Answer
Answer : B. Sodium gates open
Description
31- During the conduction of nerve impulse, hyperpolarization would not occur if:
A. Sodium gates didn’t close in time
B. Potassium gates were not so lousy
C. Sodium potassium pump stopped working
D. Calcium gates open instantly
View Answer
Answer : B. Potassium gates were not so lousy
Description
32- Which of the following is a characteristics of electrical synapse?
A. Presence of neurotransmitters
B. Transmission of nerve impulse
C. Sodium potassium gradient
D. Absence of neurotransmitter
View Answer
Answer : D. Absence of neurotransmitter
Description
33- Which option given below characterizes refractory period?
A. Reversal of charges across neural membrane
B. Change in the type of ions across the membrane
C. Next impulse can be conducted
D. Membrane potential +50mV
View Answer
Answer : C. Next impulse can be conducted
Description
34- During complex activity of flight, birds require the coordination of many skeletal muscles. Which part of their brain has to be well developed?
A. Amygdala
B. Cerebrum
C. Cerebellum
D. Thalamus
View Answer
Answer : C. Cerebellum
Description
35- Which part of the brain is actively used by mathematician trying to formulate a new equation?
A. Hippocampus
B. Cerebrum
C. Amygdala
D. Pons
View Answer
Answer : B. Cerebrum
Description
36- A desert mammal faces severe dehydration in a hot sunny day. Which internal condition would lead to secretion of ADH?
A. High osmotic pressure of blood
B. High blood pressure
C. Low solute potential of blood
D. Low osmotic pressure of blood
View Answer
Answer : A. High osmotic pressure of blood
Description
37- Which disorder would be diagnosed by a doctor on seeing a patient with thick and dry skin; puffy eyes and low metabolic rate?
A. Créunism
B. Cushing disease
C. Myxedema
D. Addison’s disease
View Answer
Answer : C. Myxedema
Description
38- Choose the one related to hypoparathyroidism:
A. Kidney stones
B. Hypercalcemia
C. Weakness of muscles
D. Tetany
View Answer
Answer : D. Tetany
Description
39- Choose the mismatched pair:
A. Graffian follicle – progestrone
B. ICSH – interstial cell
C. LH – ovulation
D. Estrogen – inhibits FSH
View Answer
Answer : A. Graffian follicle - progestrone
Description
40- Which of the following is an example of negative feedback mechanism?
