Test 23 (Class 11) - Type Bio SCAN (Old NCERT)Contact Number: 8527521718Test 23 (Class 11) - Type Bio SCAN (Old NCERT)Contact Number: 8527521718| 1. | epidermal cells | 2. | mesophyll cells |
| 3. | bundle sheath | 4. | guard cells |
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
Which one of the following is not a micronutrient?
1. Molybdenum
2. Magnesium
3. Zinc
4. Boron
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 NADP+ |
| 4. | the synthesis of ATP |
1. lignified thick walls
2. cohesion and adhesion
3. weak gravitational pull
4. transpiration pull
The free-living, anaerobic nitrogen-fixer is:
1. Beijerinckia
2. Rhodospirillum
3. Rhizobium
4. Azotobacter
About 98 percent of the mass of every living organism is composed of just six elements including carbon, hydrogen, nitrogen, oxygen and:
1. phosphorus and sulphur
2. sulphur and magnesium
3. magnesium and sodium
4. calcium and phosphorus
In cyclic photophosphorylation, the primary electron acceptor is:
1. Iron-sulfur protein
2. Ferredoxin
3. Plastocyanin
4. Pheophytin
The cause of root pressure is:
1. cohesion of water molecules
2. adhesion of water molecules to wall of xylem
3. transpiration of water out of xylem
4. osmotic flow of water into the xylem
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 |
Which of the following statements is true for the diagrams? 
1. The beet core in beaker A is at equilibrium with the surrounding water.
2. The beet core in beaker B will lose water to the surrounding environment.
3. The beet core in beaker B would be more turgid than the beet core in beaker A.
4. The beet core in beaker A is likely to gain so much water that its cells will rupture.
Phototropic curvature is the result of uneven distribution of:
1. gibberellin
2. phytochrome
3. cytokinins
4. auxin
An investment of loose connective tissue entering the liver with the portal vessels and sheathing the larger vessels in their course through the organ is termed as:
1. Falciform ligament
2. Glisson’s capsule
3. Cantlie’s line
4. Ligamentumteres
| Assertion (A): | Apples are generally stored in bins flushed with carbon dioxide. |
| Reason (R): | A burst of ethylene production in fruits triggers the ripening process. |
| 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. |
Which of the following gastric cells indirectly help in erythropoiesis?
1. Goblet cells
2. Mucous cells
3. Chief cells
4. Parietal cells
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. |
The region of the stomach into which the espophagus opens is called as:
1. Cardiac
2. Fundic
3. Corpus
4. Pyloric
Promotion of rooting in stem cuttings in plants can be promoted by the use of:
1. Gas
2. Ethylene
3. Auxins
4. Cytokinins
The serous secretions [enzyme rich] are stimulated by the hormone:
1. cholecystokinin
2. secretin
3. enterogastrone
4. enterocrinin
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
Cornea transplant in humans is almost never rejected. This is because
1. It is a non-living layer.
2. Its cells are least penetrable by bacteria.
3. It has no blood supply.
4. It is composed of enucleated cells.
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
The maculae are the sensory organs in the:
1. cochlear duct
2. saccule
3. semicircular canals
4. semicircular ducts
In the mammalian eye, the ‘fovea’ is the center of the visual field, where?
1. high density of cones occur, but has no rods
2. the optic nerve leaves the eye
3. only rods are present
4. more rods than cones are found