1. | 6 and 6 | 2. | 6 and 9 |
3. | 12 and 15 | 4. | 18 and 12 |
In light reaction, plastoquinone facilitates the transfer of electrons from:
1. Cytb6f complex to PS-I
2. PS-I to NADP+
3. PS-I to ATP synthase
4. PS-II to Cytb6f complex
The pathway that normally occurs whether or not oxygen is present would be would be:
I. glycolysis
II. fermentation
III. citric acid cycle
1. Only I
2. I and II only
3. II only
4. III only
Stroma in the chloroplasts of higher plants contains:
1. light-independent reaction enzymes
2. light-dependent reaction enzymes
3. ribosomes
4. chlorophyll
Glycolysis is:
1. Oxidation of glucose to glutamate
2. Conversion of pyruvate to citrate
3. Oxidation of glucose to pyruvate
4. Conversion of glucose to haem
There are certain seeds that fail to germinate even when external conditions are favourable. Some of the chemical inhibitors present in such seeds can be all of the following except:
1. | Abscisic acids | 2. | Phenolic acid |
3. | Para-ascorbic acid | 4. | Gibberellic acid |
During which stage in the complete oxidation of glucose are the greatest number of ATP molecules formed from ADP:
1. Glycolysis
2. Krebs cycle
3. Electron transport chain
4. Conversion of pyruvic acid to acetyl CoA
The space of thylakoid is separated from the stroma by a membrane. If the membrane capability to maintain an environment in the thylakoid space distinct from stroma is compromised, the process most directly affected would be:
1. the splitting of water
2. the absorption of photons by chlorophyll
3. the reduction of
4. the synthesis of ATP
COLUMN I | COLUMN II | ||
A | Jan Ingenhousz | P | Provided evidence for production of glucose when plants grow |
B | T. W Engelmann | Q | Described the first action spectrum for photosynthesis |
C | Julius von Sachs | R | Showed that sunlight is essential for photosynthesis |
D | Cornelius van Neil | S | Inferred that oxygen evolved in photosynthesis comes from water and not from carbon dioxide |
A | B | C | D | |
1. | R | Q | P | S |
2. | Q | R | S | P |
3. | P | S | R | Q |
4. | S | P | Q | R |
In most seeds, the ratio of which of the following pair of PGRs determines whether the embryo remains dormant or germinates?
1. | ABA and GA | 2. | Auxin and Cytokinin |
3. | Auxin and GA | 4. | ABA and Cytokinin |
Assertion (A): | The reaction centres in both photosystems in plants is the same. |
Reason (R): | The reaction centres of both photosystems are formed by chlorophyll b molecules. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |
In cyclic photophosphorylation, the primary electron acceptor is:
1. Iron-sulfur protein
2. Ferredoxin
3. Plastocyanin
4. Pheophytin
1. | 24 ATP | 2. | 28 ATP |
3. | 33 ATP | 4. | 38 ATP |
C4-plants are more efficient in photosynthesis than C3-plants due to:
1. | higher leaf area |
2. | presence of larger number of chloroplasts in the leaf cells |
3. | presence of thin cuticle |
4. | lower rate of photorespiration |
1. | Auxins | 2. | Cytokinins |
3. | Gibberellins | 4. | Ethylene |
I: | Current availability of carbon dioxide levels is limiting to the C4 plants. |
II: | C3 plants have a much lower temperature optimum than C4 plants. |
1. | Only I is correct | 2. | Only II is correct |
3. | Both I and II are correct | 4. | Both I and II are incorrect |
Phototropic curvature is the result of uneven distribution of:
1. gibberellin
2. phytochrome
3. cytokinins
4. auxin
The structure, shown in the halo in the given diagram, is:
1. is the master endocrine gland
2. is responsible for regulating the body's daily (circadian) clock
3. is the pneumotaxic centre
4. is the thermostat of the human body
Assertion: Apples are generally stored in bins flushed with carbon dioxide.
Reason: A burst of ethylene production in fruits triggers the ripening process.
1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false
Glucagon is a hyperglycaemic hormone. All the following are effects of this hormone except:
1. Gluconeogenesis
2. Glycogenesis
3. reduced cellular glucose uptake and utilization
4. glycogenolysis
Removal of shoot tips is a very useful technique to boost the production of tea leaves. This is because:
1. | Gibberellins prevent bolting and are inactivated. |
2. | Auxins prevent leaf drop at early stages. |
3. | Effect of auxins is removed and the growth of lateral buds is enhanced. |
4. | Gibberellins delay the senescence of leaves. |
Both cortisol and insulin:
I. favour protein anabolism
II. Cause proteolysis
III. Reduce the uptake of amino acids by the body cells
1. Only I and II are correct
2. Only I and II are correct
3. I, II and III are correct
4. I, II and III are incorrect
Promotion of rooting in stem cuttings in plants can be promoted by the use of:
1. Gas
2. Ethylene
3. Auxins
4. Cytokinins
I: | SA node is the natural pacemaker of the human heart. |
II: | SA node is the only part of that nodal musculature that is auto-excitable. |
1. | Only I is correct |
2. | Only II is correct |
3. | Both I and II are correct |
4. | Both I and II are incorrect |
Identify the incorrect feature of the red muscle fibers [with respect to the white muscle fibers]:
1. High myoglobin content
2. Plenty of mitochondria
3. High amount of sarcoplasmic reticulum
4. Dependence on aerobic metabolism
'Bundle of His' is a part of which one of the following organs in humans?
1. Heart
2. Kidney
3. Pancreas
4. Brain
The agglutinogens [antigens] and the agglutinins [antibodies] for the ABO blood group are found respectively:
1. on the erythrocytes, on the leukocytes
2. on the erythrocytes, in the plasma
3. on the leukocytes, in the plasma
4. in the plasma, on the erythrocytes
Angiotensinogen is a protein produced and secreted by:
1. macula densa cells
2. endothelial cells (cells lining the blood vessels)
3. liver cells
4. juxtaglomerular (JG) cells
Which of the following is the largest WBC?
1. neutrophils
2. monocytes
3. macrophages
4. lymphocytes
What is true about RBCs in humans?
1. | They carry about 20-25 per cent of CO2 |
2. | They transport 99.5 per cent of O2 |
3. | They transport about 80 per cent oxygen only and the rest 20 per cent of it is transported in dissolved state in blood plasma |
4. | They do not carry CO2 at all |
In a skeletal muscle, ATP:
1. is required for the dissociation of myosin from actin
2. is hydrolyzed by the ATPase in actin myofilament
3. is used to replenish cretine phosphokinase
4. is not used in breaking of cross bridges
The second largest constituent of plasma is:
1. Water
2. Proteins
3. Glucose
4. Hormones
The graph below shows tracing of pulmonary volumes during spirometery of a person. Identify A, B, C and D respectively:
1. IRV, TV, ERV and RV
2. IRV, TV, RV and ERV
3. ERV, TV, IRV and RV
4. ERV, IRV, RV and TV
Which one of the following statement with regards to the excretion by the human kidneys is correct?
1. | Descending limb of Loop of Henle is impermeable to water |
2. | Distal convoluted tubule is incapable of reabsorbing HCO3 |
3. | Nearly 99 per cent of the glomerular filtrate is reabsorbed by the renal tubules |
4. | Ascending limb of Loop of Henle is impermeable to electrolytes |
Pick out the correct match
1. | Sternum | 14 |
2. | Pelvis | 3 |
3. | Ribs | 20 |
4. | Face | 5 |
Which one of the following joints would allow no movement?
1. Ball and socket joint
2. Fibrous joint
3. Cartilaginous joint
4. Synovial joint
Respiration is controlled by
1. medulla oblongata
2. cerebellum
3. hypothalamus
4. cerebrum
A certain road accident patient with unknown blood group needs immediate blood transfusion. His one doctor friend at once offers his blood. What was the blood group of the donor?
1. Blood group B
2. Blood group AB
3. Blood group O
4. Blood group A
When fully saturated, the number of molecules each hemoglobin molecule can carry is:
1. one
2. two
3. three
4. four
Which of the following does not favour the formation of large quantities of dilute urine?
Which of the following causes an increase in sodium reabsorption in distal convoluted tubule?
1. Increase in aldosterone levels
2. Increase in antidiuretic hormone levels
3. Decrease in aldosterone levels
4. Decrease in antidiuretic hormone levels
With respect to their actions on blood glucose levels, the functions of glucagon and insulin can be regarded as:
1. Antagonistic
2. Synergistic
3. Permissive
4. Competitive inhibition
1. | Limbic system | Behaviour |
2. | Medulla oblongata | Gastric secretions |
3. | Hypothalamus | Thermoregulation |
4. | Corpus callosum | Connects cerebellum with rest of the brain |
Which one of the following pairs is the matching pair of the part and the hormone it secretes?
1. Anterior pituitary - Thyroxine
2. Alpha cells of pancreas - Glucagon
3. Thyroid - Epinephrine
4. Stomach epithelium - Secretin
Myelin sheath is produced by
1. Schwann cells and Oligodendrocytes
2. Astrocytes and Schwann cells
3. Oligodendrocytes and Osteoclasts
4. Osteoclasts and Astrocytes
Which of the following is an amino acid derived hormone?
1. Estradiol
2. Ecdysone
3. Epinephrine
4. Estriol
The blood calcium level is lowered by the deficiency of
1. parathormone
2. thyroxine
3. calcitonin
4. Both 1 and 3
I: | The resting axonal membrane is relatively more permeable to potassium ions and nearly impermeable to sodium ions. |
II: | Sodium potassium pump transports 3 Na+ outwards for 2 K+ into the cell. |
1. | Only I |
2. | Only II |
3. | Both I and II |
4. | Neither I nor II |
When a neuron is resting, the axonal membrane is relatively more permeable to potassium ions and nearly impermeable to sodium ions. This would mean that:
1. in resting conditions, all sodium channels in the axonal membrane are closed while few potassium channels are open
2. in resting conditions, the electrogenic sodium-potassium pump will pump only the sodium ions
3. in resting conditions, the electrogenic sodium-potassium pump will pump only the potassium ions
4. in resting conditions, the outer surface of the axonal membrane will carry a negative charge