In photosynthesis, the light-independent reactions take place at?
1. Thylakoid lumen
2. photosystem I
3. photosystem II
4. Stromal matrix
Cyclic -photophosphorylation results in the formation of:
1. NADPH
2. ATP and NADPH
3. ATP, NADPH, and O2
4. ATP
In aerobic cellular respiration, maximum number of ATP molecules is produced during?
1. Glycolysis
2. Oxidation of pyruvate
3. Kreb’s cycle
4. Chemiosmosis
Which of the following is not a C3 plant?
1. Rice
2. Wheat
3. Maize
4. Potato
All enzymes of the TCA cycle are located in the mitochondrial matrix except one which is located in inner mitochondrial membranes in eukaryotes and in the cytosol in prokaryotes. This enzyme is:
1. | lactate dehydrogenase | 2. | isocitrate dehydrogenase |
3. | malate dehydrogenase | 4. | succinate dehydrogenase |
1. | Only I | 2. | Only II |
3. | Both I and II | 4. | Neither I nor II |
Respiratory Quotient (RQ) value of tripalmitin is:
1. 0.09
2. 0.9
3. 0.7
4. 0.007
In the leaves of -plants, malic acid synthesis during fixation occurs in
1. epidermal cells
2. mesophyll cells
3. bundle sheath
4. guard cells
Identify the incorrect match:
C3 plants | C4 plants | ||
1. | Primary carbon dioxide acceptor | RuBP | PEP |
2. | Primary carbon dioxide fixation product | PGA | OAA |
3. | Presence of PEPcase | Yes | Yes |
4. | Cell type in which initial carboxylation reaction occurs | Mesophyll | Bundle sheath |
Current availability of carbon dioxide is limiting to C3 plants . This means that:
1. At low light intensity, C3 plants respond to high CO2 concentrations
2. Growing plants like tomatoes in carbon dioxide-rich environment is unlikely to increase yield
3. They show saturation in the rates of photosynthesis at carbon dioxide concentration higher than the current level
4. They have better water use efficiency and thus, adapted to warm tropical climates
Assertion: For every three molecules of that enter the Calvin cycle, six molecules of G3P are formed but only one molecule of G3P can be counted as a net gain.
Reason: The rest are required to complete the cycle.
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
1. | only PS I is functional |
2. | both photosystems work in series, first PS I and then PS II |
3. | only ATP synthesis takes place and NADPH is not synthesized |
4. | both ATP and NADPH are synthesized |
If the chloroplasts are illuminated by sunlight, where do you expect to find the pH to be lowest?
1. Stroma
2. Intermembrane space [between outer and inner membranes]
3. Space enclosed by thylakoid membranes
4. Cytosol
1. | Breaking seed and bud dormancy |
2. | Horizontal growth of seedlings, swelling of axis and apical hook formation in dicot seedlings |
3. | Enhancement of respiration rate during ripening of fruits |
4. | Closure of stomata during water stress |
I: | is the ratio of the volume of carbon dioxide evolved to the volume of oxygen evolved |
II: | is 1, if carbohydrates are used as respiratory substrates and are completely oxidized |
1. | Only I is correct |
2. | Only II is correct |
3. | Both I and II are correct |
4. | Both I and II are incorrect |
Match the following concerning the activity/function and the phytohormone involved:
Column I | Column II | ||
(a) | Fruit ripener | (i) | Abscisic acid |
(b) | Herbicide | (ii) | GA 3 |
(c) | Bolting agent | (iii) | 2, 4-D |
(d) | Stress hormone | (iv) | Ethephon |
Select the correct option from following:
Options: | (a) | (b) | (c) | (d) |
1. | (ii) | (iii) | (iv) | (i) |
2. | (iii) | (iv) | (ii) | (i) |
3. | (iv) | (iii) | (ii) | (i) |
4. | (iv) | (ii) | (i) | (iii) |
Assertion (A): | The sino-atrial node is normally the pacemaker of the human heart. |
Reason (R): | It is the only auto-excitable part of the nodal tissue of the human heart. |
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. |
Consider the given two statements:
I. 2,4-D [2,4-Dichlorophenoxyacetic acid] is widely used as a herbicide.
II. 2,4-D acts by mimicking the action of the plant growth hormone auxin, which results in uncontrolled growth and eventually death in susceptible plants.
1. Both I and II are correct and II explains I
2. Both I and II are correct but II does not explain I
3. I is correct but II is incorrect
4. Both I and II are incorrect
Identify the incorrectly matched pair:
1. | Occipital bone | Cranial bone that has condyles for articulation with superior region of the vertebral column |
2. | Ethmoid | Cranial bone forming the superior roof of the nasal cavity |
3. | Sphenoid | Cranial bone that has a saddle-like depression, location of pituitary |
4. | Frontal bone | An unpaired cranial bone |
Seed dormancy is due to:
1. Ethylene
2. Abscisic acid
3. IAA
4. Starch
Consider the given two statements:
I. Human kidneys can produce urine nearly four times concentrated than the initial filtrate formed.
II. About 85% of the nephrons in the human kidney are juxtamedullary nephrons.
1. Both I and II are correct and II explains I
2. Both I and II are correct but II does not explain I
3. I is correct but II is incorrect
4. Both I and II are incorrect
One of the synthetic auxin is:
1. NAA
2. IAA
3. GA
4. IBA
Consider the two statements:
I. About 97 percent of oxygen and 20-25 percent of carbon dioxide is transported by RBC.
II. Oxygen is more soluble in water than carbon dioxide
1. Both I and II are correct and II explains I
2. Both I and II are correct but II does not explain I
3. I is correct but II is incorrect
4. Both I and II are incorrect
Calcium, vital for muscle contraction, is stored in:
1. transverse tubules
2. myosin head
3. myofibrils
4. sarcoplasmic reticulum
Given below are four statements (a-d) regarding human blood circulatory system:
(a) | Arteries are thick-walled and have narrow lumen as compared to veins |
(b) | Angina is acute chest pain when the blood circulation to the brain is reduced |
(c) | Persons with blood group AB can donate blood to any person with any blood group under ABO system |
(d) | Calcium ions play a very important role in blood clotting |
Which two of the above statements are correct?
1. (a) and (b)
2. (b) and (c)
3. (c) and (d)
4. (a) and (d)
The colloid osmotic pressure in the blood is mainly due to:
1. albumin
2. glucose
3. RBCs
4. globulins
Vasoconstriction can be brought about by:
I. ADH
II. Angiotensin
III. ANF
1. Only II
2. Only I and II
3. Only I
4. I, II, and III
The lymph eventually enters the circulation by draining into two specific ___________.
1. arteries
2. arterioles
3. capillaries
4. veins
Select the favorable conditions required for the formation of oxyhemoglobin at the alveoli.
1. High pO2, high pCO2, less H+, higher temperature
2. Low pO2, low pCO2, more H+, higher temperature
3. High pO2, low pCO2, less H+, lower temperature
4. Low pO2 high pCO2 more H+, higher temperature
The number of phalanges in thumb is/are:
1. 1
2. 2
3. 3
4. 4
The haemoglobin content per 100 ml of blood of a normal healthy human adult is:
1. 25-30 g
2. 17-20g
3. 12-16 g
4. 5-11
Pulmonary fibrosis is the feature of all cases of:
1. Occupational respiratory disorders
2. Emphysema
3. Pneumonia
4. Bronchial asthma
Match the incorrectly matched pair:
Nitrogenous waste/ Excretory organ |
Animal |
|
1. |
Ammonia |
Aquatic insects |
2. |
Uric acid |
Land snails |
3. |
Protonephridia |
Urochordate-Amphioxus |
4. |
Antennal glands |
Prawns |
All the following shorten during muscle contraction except:
1. sarcomere
2. A bands
3. I bands
4. H bands
Sliding filament theory can be best explained as:
1. | when myofilaments slide past each other, actin filaments shorten while myosin filament does not shorten |
2. | actin and myosin filaments shorten and slide past each other |
3. | actin and myosin filaments do not shorten but rather slide pass each other |
4. | when myofilaments slide past each other, myosin filaments shorten while actin filaments do not shorten |
Chemosensitive area of respiratory centre medulla is affected by
1. less and ions
2. less and ions
3. excess and H+ ions
4. excess and H+ ions.
What would be the heart rate of a person if the cardiac output is 5L, blood volume in the ventricles at the end of diastole is 100 mL and at the end of ventricular systole is 50 mL?
1. 125 beats per minute
2. 50 beats per minute
3. 75 beats per minute
4. 100 beats per minute
Name the chronic respiratory disorder caused mainly by cigarette smoking
1. asthma
2. respiratory acidosis
3. respiratory alkalosis
4. emphysema
If the cardiac output is about 6L/min, the renal blood flow/min would be about:
1. 180 L
2. 1200 ml
3. 500 ml
4. 700 ml
The proximal convoluted tubule of the nephron reabsorbs about what fraction of the filtrate?
1. 99%.
2. 85%.
3. 65%.
4. 19%.
Melatonin is secreted by:
1. Pineal gland
2. Skin
3. Pituitary Gland
4. Thyroid
A canal called the cerebral aqueduct passes through the:
1. Forebrain
2. Midbrain
3. Hindbrain
4. Spinal cord
1. Parathyroid and adrenal
2. Pancreas and parathyroid
3. Thymus and testes
4. Adrenal and ovary
1. | respiration | 2. | cardiovascular reflexes |
3. | gastric secretions | 4. | body temperature |
Feeling the tremors of an earthquake, a scared resident of the seventh floor of a multi-storey building starts climbing down the stairs rapidly. Which hormone initiated this act?
1. Thyroxine
2. Adrenaline
3. Glucagon
4. Gastrin
Which one of the following pairs of hormones are the examples of those that can easily pass through the cell membrane of the target cell and bind to a receptor inside it (mostly in the nucleus)?
1. Insulin and glucagon
2. Thyroxin and insulin
3. Somatosatin and oxytocin
4. Cortisol and testosterone
I: | is a part of the brain stem |
II: | is a part of the hind brain |
III: | is a part of the limbic system |
1. | Only I and II | 2. | Only I and III |
3. | Only II and III | 4. | I, II and III |
A | B | C | D | |
1. | Muscle spindle | Motor end plate | Afferent pathway | Efferent pathway |
2. | Muscle spindle | Motor end plate | Efferent pathway | Afferent pathway |
3 | Motor end plate | Muscle spindle | Efferent pathway | Afferent pathway |
4. | Motor end plate | Muscle spindle | Afferent pathway | Efferent pathway |