Biology 1 - Section A
1. In the aerobic process of respiration the presence of oxygen is vital, since it act as:
I: the final electron acceptor.
II: the final proton acceptor.
1. Only I is correct
2. Only II is correct
3. Both I and II are incorrect
4. Both I and II are correct
2. Sucrose is converted into glucose and fructose by the enzyme:
1. Sucrase |
2. Aldolase |
3. Invertase |
4. Zymase |
3. The shape of the growth curve characteristic of a living organism growing in natural environment is:
1. Linear |
2. Sigmoid |
3. Hyperbola |
4. Bell shaped |
4. A and a plant were fed with carbon dioxide radioactively labeled with an isotope of carbon. In which of the following molecules, respectively in and plants, would radioactivity first appear as photosynthesis progresses?
1. PGA and OAA |
2. Water and PGAL |
3. PGAL and Malic acid |
4. PEP and RuBP |
5. If fatty acids were to enter the respiratory pathway, they must be converted to a molecule with:
1. |
Two carbons |
2. |
Three carbons |
3. |
Five carbons |
4. |
Six carbons |
6. Identify the correct statement regarding the functioning of photosystem II?
1. The reaction center is P700.
2. It works after PS I in non cyclic photophosphorylation.
3. Water splits and carbon dioxide is released.
4. The electron vacancies in P680 are filled by electrons derived from water.
7. Consider the given two statements:
Statement I: Except for plants in shade or in dense forests, light is rarely a limiting factor in nature.
Statement II: There is a linear relationship between incident light and carbon dioxide fixation rates at low light intensities.
1. Both Statement I and Statement II are correct and Statement II explains Statement I
2. Both Statement I and Statement II are correct but Statement II does not explain Statement I
3. Statement I is correct but Statement II is incorrect
4. Statement I is incorrect but Statement II is correct
8. The stroma lamellae membranes:
1. have both PS II and NADP reductase enzyme
2. have PS II but not NADP reductase enzyme
3. lack PS II but have NADP reductase enzyme
4. lack both PS II and NADP reductase enzyme
9. Regarding the light-independent reactions:
I: |
they occur in the stroma of the chloroplast. |
II: |
NADPH and ATP from the light-dependent reactions are used. |
III: |
Carbon dioxide is oxidized to form a carbohydrate. |
IV: |
they are most likely to occur during the night. |
1. Only I and II are correct
2. Only I, II and III are correct
3. Only II, III and IV are correct
4. I, II, III and IV are correct
10. The numbers of FADH2, ATP, Carbon dioxide and NADH molecules produced in a single turn of citric acid cycle respectively are:
1. | One, Two, Three and Four | 2. | One, One, Two and Three |
3. | One, Two, Two and Three | 4. | Two, One Two and Three |
11. Consider the given two statements:
Statement I: |
Acetyl CoA will combine with the four-carbon oxaloacetate in the Krebs cycle to form the six-carbon citrate. |
Statement II: |
The reaction mentioned in Statement I is catalyzed by Oxaloacetate synthase enzyme. |
1. Statement I is correct; Statement II is correct
2. Statement I is incorrect; Statement II is correct
3. Statement I is correct; Statement II is incorrect
4. Statement I is incorrect; Statement II is incorrect
12. Consider the two statements:
Assertion (A): |
Current availability of CO2 levels is limiting to the C3 plants. |
Reason: |
Carbon dioxide is the major limiting factor for photosynthesis. |
1. |
(A) is True but (R) is False |
2. |
Both (A) and (R) are True and (R) explains (A) |
3. |
Both (A) and (R) are True but (R) does not explain (A) |
4. |
(A) is False but (R) is True |
13. Identify the plant growth regulator that, though is largely an inhibitor but, can be placed in both plant growth promoter and plant growth inhibitor groups?
1. Auxins |
2. Gibberellins |
3. Ethylene |
4. Abscisic acid |
14. During the conversion of succinyl CoA to succinic acid in TCA cycle:
1. One molecule of ATP is directly synthesized
2. is reduced
3. FAD is reduced
4. One molecule of GTP is synthesized
15. The stage of cellular respiration that directly involves oxygen is:
1. |
glycolysis |
2. |
at the end of ETC |
3. |
Krebs cycle |
4. |
the phosphorylation of ADP to form ATP |
16. In a photosystem:
1. |
The reaction centre is where light is captured, while the antenna complex is where this light energy is transformed into chemical energy. |
2. |
The antenna complex is where light is captured, while the reaction centre is where this light energy is transformed into chemical energy. |
3. |
The antenna complex is where light energy is captured and transformed into chemical energy. |
4. |
The reaction centre is where light energy is captured and transformed into chemical energy. |
17. The reaction 2 in the given figure is catalysed by the enzyme:
1. Pyruvate decarboxylase
2. Pyruvate kinase
3. Pyruvate dehydrogenase
4. Pyruvate synthetase
Biology 1 - Section B
18. In inspiration during pulmonary ventilation the correct order of the given events is:
a. air flows into the lungs
b. alveolar volume increases
c. thoracic volume increases
d. pleural pressure decreases
e. alveolar pressure decreases
1. |
a, b, c, d, e |
2. |
b, e, a, c, d |
3. |
c, d, b, e, a |
4. |
d, e, b, a, c |
19. How many of the given statements are correct:
I: |
Gastrin acts on the gastric glands and inhibits the secretion of hydrochloric acid and pepsinogen. |
II: |
Secretin acts on the endocrine pancreas and inhibits secretion of water and bicarbonate ions. |
III: |
CCK acts on both pancreas and gall bladder and inhibits the secretion of pancreatic enzymes and bile juice, respectively. |
IV: |
GIP inhibits gastric secretion and motility. |
20. Consider the given two statements:
Assertion: |
Synthetic auxin herbicides, including 2,4-dichlorophenoxyacetic acid (2,4-D) have been developed and used for broadleaf weed control. |
Reason: |
Auxins are toxic to plants in large concentrations; they are most toxic to dicots and less so to monocots. |
1. Assertion is true; Reason is false
2. Both Assertion and Reason are true and Reason correctly explains the Assertion
3. Assertion is false; Reason is true
4. Both Assertion and Reason are true but Reason does not correctly explain the Assertion
21. Hemoglobin's oxygen binding affinity is inversely related both to acidity and to the concentration of carbon dioxide. This is:
1. Haldane effect
2. Bohr effect
3. Herring Breuer reflex
4. Henry’s law
22. The hypothalamus:
Statement I: |
is the apical part of diencephalon, forebrain. |
Statement II: |
contains several groups of neurosecretory cells called nuclei which produce hormones. |
1. Statement I is incorrect; Statement II is correct
2. Statement I is correct; Statement II is incorrect
3. Statement I is correct; Statement II is correct
4. Statement I is incorrect; Statement II is incorrect
23. Consider the following statements:
I: |
Glomerulus is a tuft of capillaries formed by the efferent arteriole |
II: |
Afferent arteriole forms the peritubular capillary network |
III: |
Vasa recta is absent or highly reduced in juxtamedullary nephrons |
1. |
Only III is correct |
2. |
I is correct but II and III are incorrect |
3. |
I, II and III are incorrect |
4. |
I and II are correct |
24. The alveoli are lined with:
1. Simple cuboidal epithelium
2. Pseudo-stratified columnar ciliated epithelium
3. Transitional epithelium
4. Simple squamous epithelium
25. Ethylene does not:
1. induce flowering in mango
2. hasten fruit ripening in tomatoes and apples
3. retard abscission of flowers and fruits in cotton cherry and walnut
4. promote female flowers in cucumbers
Biology 2 - Section A
26. The change in electrical potential that occurs between the inside and outside of a nerve or muscle fiber when it is stimulated, serving to transmit nerve signals is called as:
1. Action potential |
2. Threshold potential |
3. Reversal potential |
4. Excitatory post synaptic potential |
27. Which of the following recordings of blood pressure in a healthy person will be considered as normal?
1. |
150/80 mmHg |
2. |
110/70 mmHg |
3. |
120/96 mmHg |
4. |
180/110 mmHg |
28. Which of the following is incorrect regarding emphysema?
1. |
Alveolar walls are damaged |
2. |
There is an increase in the respiratory surface |
3. |
Major cause is cigarette smoking |
4. |
Can be caused by deficiency of Alpha-1-antitrypsin enzyme |
29. The type of joint that will allow least mobility amongst the following would be:
1. Fibrous joint |
2. Primary cartilaginous joint |
3. Secondary cartilaginous joint |
4. Synovial joint |
30. The enzyme that activates fibrinogens in the blood is:
1. |
Thromboplastin |
2. |
Thrombokinase |
3. |
Thrombin |
4. |
Plasmin |
31. The autonomic regulation of cardiac activity is carried out by a neural center located in:
1. |
Medulla oblongata |
2. |
Hypothalamus |
3. |
Cerebrum |
4. |
Thalamus |
32. With respect to the red muscle fibers [Type I], the white muscle fibers [Type II] are richer in:
1. |
Blood capillaries |
2. |
Myoglobin |
3. |
Sarcoplasmic reticulum |
4. |
Mitochondria |
33. What separates the atria from the ventricles so that the atrial impulse does not spill onto the ventricles?
1. fibrous skeleton |
2. AV bundle |
3. visceral pericardium |
4. Purkinje fibers |
34. Identify the correct statement regarding the protein shown in the given figure:
1. It makes up the I band of the sarcomere and A is Troponin, B is Tropomyosin and C is F-actin
2. It makes up the A band of the sarcomere and A is Troponin, B is Tropomyosin and C is F-actin
3. It makes up the I band of the sarcomere and A is Calmodulin, B is Tropomyosin and C is G-actin
4. It makes up the A band of the sarcomere and A is Calmodulin, B is Tropomyosin and C is F-actin
35. Urea is:
1. more toxic than ammonia
2. produced in kidneys
3. energetically more expensive to produce than ammonia
4. never present in human blood
36. Juxtamedullary nephrons:
1. are more common than cortical nephrons
2. do not have a well developed vasa recta associated with them
3. play a very important role in concentration of urine
4. produce angiotensinogen
37. What amount of carbon dioxide is delivered by every 100 ml of deoxygenated blood at the alveoli under normal physiological conditions?
1. 4 ml |
2. 5 ml |
3. 15 ml |
4. 20 ml |
38. Removal rate of carbon dioxide by lungs is approximately:
1. |
125 ml/minute |
2. |
200 ml/minute |
3. |
280 ml/minute |
4. |
325 ml/minute |
39. Match each item in Column I with one in Column II and select the correct match from the codes given:
|
Column I |
|
Column II |
A |
Multipolar neuron |
P |
Embryonic stage |
B |
Bipolar neuron |
Q |
Retina |
C |
Unipolar neuron |
R |
Cerebral cortex |
Code:
|
A |
B |
C |
1. |
P |
Q |
R |
2. |
Q |
R |
P |
3. |
R |
Q |
P |
4. |
R |
P |
Q |
40. Identify the incorrect statement regarding proximal convoluted tubule:
1. It is lined by simple cuboidal brush bordered epithelium
2. It reabsorbs 70-80 % of electrolytes and water and nearly all nutrients
3. In juxta-medullary nephrons, it extends deep into the renal medulla
4. It secretes hydrogen ions, ammonia and reabsorbs bicarbonate ions to maintain the ionic and pH balance of the body fluids
41. Consider the given statements regarding the nodal tissue of human heart as shown in the given diagram:
I: A is the normal pacemaker of the human heart and B is the pace-setter of the human heart.
II: While A is made up of muscle tissue, B is made up of neural tissue.
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
42. A bone disorder especially seen in post-menopausal women would be:
1. |
Rheumatoid arthritis |
2. |
Rickets |
3. |
Bone cancer |
4. |
Osteoporosis |
Biology 2 - Section B
43. What would be true for Z1, Z2 and Z3 as shown in the given diagram?
I. Z1 is functionally related to sympathetic neural system.
II. Only the hormones secreted by Z2 are steroids.
III. The hormone secreted by Z3 is an androgen.
IV. The hormone secreted by Z1 mainly affects the carbohydrate, lipid and fat metabolism and is a potent anti-inflammatory agent.
V. All hormones produced by Z1, Z2 and Z3 act through a second messenger on their target cells.
1. |
Only IV |
2. |
Only IV and V |
3. |
Only III |
4. |
I, II and III |
44. Identify the incorrect statement:
I. Ovary is the primary female sex organ and testis is the primary male sex organ.
II. Oestrogen is synthesised by the growing ovarian follicles and progesterone is secreted by the corpus luteum mainly.
1. Only I |
2. Only II |
3. Both I and II |
4. Neither I nor II |
45. The hormones of ‘flight or fight’ response:
1. are secreted by the zona glomerulosa of adrenal cortex
2. are commonly called as catecholamines
3. are released slowly over a period of time when required
4. do not act via a second messenger system
46. Diabetes insipidus, characterized by water loss and dehydration, is caused by:
1. |
Hyposecretion of ADH |
2. |
Hypersecretion of ADH |
3. |
Hyposecretion of insulin |
4. |
Hypersecretion of insulin |
47. The axonal membrane:
1. |
is relatively more permeable to potassium ions than to sodium ions during its resting stage |
2. |
is relatively more permeable to sodium ions than to potassium ions during its resting stage |
3. |
is equally permeable to potassium ions and to sodium ions during its resting stage |
4. |
is impermeable to potassium ions and to sodium ions during its resting stage |
48. The only hormone secreted by pars intermedia of hypophysis is:
1. MSH |
2. GnRH |
3. Vasopressin |
4. Prolactin |
49. The olfactory bulb can be regarded as the extension of:
1. Brain stem |
2. Limbic system |
3. Diencephalon |
4. Corpora quadrigemina |
50. The brain stem includes all the following except:
1. Medulla oblongata |
2. Pons |
3. Mid brain |
4. Cerebellum |
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