Auxins:
I: | promote flowering in pineapples |
II: | induce parthenocarpy in tomatoes |
III: | like 2,4-D kill monocot weeds |
IV: | control xylem differentiation |
1. Only I and II are correct
2. Only III is incorrect
3. I, II, III and IV are correct
4. Only I and IV are incorrect
The number of steps in the Kreb's cycle where oxidative decarboxylation takes place is:
1. | 1 | 2. | 2 |
3. | 3 | 4. | 6 |
1. | 0.7 | 2. | 0.9 |
3. | 1.0 | 4. | 4.0 |
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
Assertion (A): | Plants retain the capacity for unlimited growth throughout their life. |
Reason (R): | Plants have meristems at certain locations in their body. |
In the light of the above statements choose the correct answer from the options given below:
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. |
The diagram shows the famous Engelmann experiment that helped us understand important aspects of the process of photosynthesis. What conclusion can be drawn by the pattern of accumulation of aerobic bacteria shown in the diagram?
1. Excess carbon dioxide is released by the alga in the area of accumulation.
2. Only red and violet lights are effective for photosynthesis.
3. In the areas of accumulation, most oxygen was liberated by the alga.
4. Bacteria are attracted to red and blue light.
I: | the membrane system is responsible for trapping the light energy and for the synthesis of ATP and NADPH. |
II: | in stroma, enzymatic reactions synthesise sugar, which in turn forms starch and synthesis of ATP but not NADPH takes place. |
The net gain of number of ATP molecules during glycolysis will be:
1. 2 | 2. 4 |
3. 6 | 4. 8 |
Oxygen, during oxygenic photosynthesis, is produced during:
1. cyclic photophosphorylation
2. the light-dependent reactions involving photosystems I and II
3. Calvin cycle
4. the Krebs cycle
1. | OAA | 2. | PEP |
3. | PGA | 4. | RuBP |
The products of fermentation do not include:
1. | CO2 | 2. | O2 |
3. | ethanol | 4. | lactate |
Oxygen drives the process of ATP production via ETS. The best explanation for this would be that oxygen:
1. is needed at the end of the aerobic respiration
2. is the terminal electron donor
3. is not required in the glycolytic pathway
4. acts as the final hydrogen acceptor
1. ABA | 2. IAA |
3. Ethylene | 4. GA |
I: | Axial skeleton comprises 80 bones distributed along the main axis of the body. |
II: | The skull is composed of 22 bones. |
III: | Cranial bones are 14 in number. |
IV: | The facial region is made up of 8 skeletal elements which form the front part of the skull. |
The formation of oxy-hemoglobin at the alveoli is favored by all the following except:
1. High pO2 | 2. Low pCO2 |
3. Lower H+ ion concentration | 4. Higher temperature |
Statement I: | First seven pairs of ribs are called true ribs and are attached to the thoracic vertebrae and ventrally connected to the sternum with the help of elastic cartilage. |
Statement II: | The 8th, 9th and 10th pairs are false ribs and join the seventh rib with the help of elastic cartilage. |
1. Only I is correct | 2. Only II is correct |
3. Both are correct | 4. Both are incorrect |
Assertion (A): | The sinoatrial (SA) node region of the right atrium is the normal pacemaker of the heart. |
Reason (R): | The human heart is myogenic in nature. |
1. | (A) is True but (R) is False |
2. | Both (A) and (R) are True and (R) correctly explains (A) |
3. | (A) is False but (R) is True |
4. | Both (A) and (R) are True but (R) does not correctly explain (A) |
The figure shows pulmonary volumes as measured on a spirometer. Which of the following will be true?
I. A+B = Inspiratory Reserve Volume II. C+D = Functional Residual Capacity III. B+C = Tidal Volume IV. [(A+B+C+D) – (A+B+C)] = Residual Volume |
In hemodialysis, the role of artificial kidney is actually played by:
1. | Dialysate | 2. | Blood pump |
3. | Water system | 4. | Cellulose membrane |
Consider the two statements:
I: | The process of filtration at Malpighian body is regarded as ultrafiltration. |
II: | Blood is filtered so finely that all constituents of plasma pass into the lumen of Bowman’s capsule. |
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. | I is incorrect but II is correct |
The dark and light bands seen as striations in a skeletal muscle are located on:
1. | Myofilaments | 2. | Muscle fiber |
3. | Myofibril | 4. | Motor unit |
Protonephridia are the excretory structures in all the following except:
1. Planaria | 2. Rotifers |
3. Amphioxus | 4. Prawns |
Consider the two statements:
I: | Electric synapses are rare in our system. |
II: | Impulse transmission across electric synapse is always faster than across a chemical synapse. |
1. Both I and II are correct and II explains I
2. Both I and II are correct and II does not explain I
3. Only I is correct
4. Only II is correct
A canal called the cerebral aqueduct passes through the:
1. Cerebral hemispheres | 2. Diencephalon |
3. Mid brain | 4. Hind brain |
The peripheral chemoreceptors are:
1. more sensitive to a decrease in than to a decrease in
2. stimulated by hypocapnia
3. located in the medulla oblongata of the brain stem
4. more sensitive to a decrease in than to a decrease in
The region of human kidney where you expect to find maximum osmolarity is:
1. at the top of the renal cortex
2. at the bottom of the renal cortex
3. at the top of the renal medulla
4. at the bottom of the renal medulla
The axial skeleton in human beings include:
1. skull, vertebral column, hyoid bone and rib cage
2. arms, legs, and pelvic girdle
3. skull and pectoral girdle
4. sternum, rib cage, vertebral column, and pelvic girdle
The joint between atlas and axis vertebra is classified as:
1. | Saddle joint | 2. | Pivot joint |
3. | Gliding joint | 4. | Hinge joint |
Passive filling accounts for about what percent of ventricular filling?
1. | 30 | 2. | 50 |
3. | 70 | 4. | 90 |
When anti B antibodies are present in the plasma and A antigens on the surface of RBCs of a person, her blood group can be:
1. A and AB | 2. Only A |
3. Only B | 4. O |
1. I and III only | 2. I and II only |
3. II and IV only | 4. II and III only |
Identify the correct statement:
1. | Unmyelinated neurons in PNS are not surrounded by Schwann cell |
2. | Electrical synapses, being faster, are more common in the human body |
3. | Pia mater is in contact with the brain tissue |
4. | The entire hindbrain and the midbrain constitute the brain stem |
I: | Repeated activation of muscles can lead to fatigue. |
II: | Repeated activation of muscles can lead to accumulation of lactic acid. |
Assertion (A): | Neurons are excitable cells. |
Reason (R): | Their membranes are in a polarised state. |
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. | (A) is false but (R) is true. |
In a normal ECG, The T wave represents:
1. | ventricular depolarization | 2. | atrial repolarization |
3. | ventricular repolarization | 4. | atrial depolarization |
I: | is a part of the rhombencephalon. |
II: | contains a number of centres which control body temperature, urge for eating and drinking. |
III: | contains several groups of neurosecretory cells, which secrete hormones called hypothalamic hormones. |
Assertion (A): | Once initiated, the action potential has a magnitude that is independent of the strength of the triggering stimulus. |
Reason (R): | Action potentials are all or none responses to stimuli. |
In the light of the above statements choose the correct answer from the options given below:
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. |
The definition of hormone describes them as having all the following features except:
1. non-nutrient chemicals | 2. intra-cellular messengers |
3. produced in trace amounts | 4. act on distant target organs |
All the following hormones are produced by anterior pituitary except:
1. Gonadotropins | 2. ACTH |
3. Prolactin | 4. Melatonin |
Thymus:
I. is located ventral to the heart/aorta
II. plays a major role in differentiation of T-lymphocytes
III. promotes production of antibodies
IV. enlarges with age
1. Only I, II and III are correct
2. Only I, III and IV are correct
3. Only II, III and IV are correct
4. I, II, III and IV are correct
Match each item in Column I [Hormone] with one in Column II [Function] and select your answer from the codes given:
Column I |
Column II |
A. ADH |
a. Makes collecting duct permeable to water and urea |
B. PTH |
b. Stimulates osteoclasts |
C. LH |
c. Rupture of Graafian follicle leading to ovulation |
D. ANF |
d. Causes vasodilation |
Codes
A | B | C | D | |
1. | a | b | c | d |
2. | a | b | d | c |
3. | b | a | d | c |
4. | b | a | c | d |
All the following are common second messengers involved in hormonal actions except:
1. Cyclic adenosine monophosphate
2. Inositol phosphate
3. Prostaglandins
4. Calcium
I: | helps in maintaining the normal rhythms of sleep-wakefulness cycle and body temperature. |
II: | influences metabolism, pigmentation and the menstrual cycle. |