A lake near a village suffered heavy mortality of fish within a few days. Consider the following reasons for this:
| 1. | Lots of urea and phosphate fertilizer were used in the crops in the vicinity. |
| 2. | The area was sprayed with DDT by an aircraft. |
| 3. | The lake water turned green and stinky |
| 4. | Phytoplankton populations in the lake declined initially, thereby, greatly reducing photosynthesis. |
Which two of the above were the main causes of fish mortality in the lake?
1. 2, 3
2. 3, 4
3. 1, 3
4. 1, 2
Subtopic: Water Pollution: I | Water Pollution: II | Water Pollution |
Level 3: 35%-60%
AIPMT - 2008
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Given below is a diagrammatic cross-section of a single loop of human cochlea.
Which one of the following options correctly represents the names of three different parts?
| 1. | B: Tectorial membrane C: Perilymph D: Secretory cells |
| 2. | C: Endolymph D: Sensory hair cells A: Serum |
| 3. | D: Sensory hair cells A: Endolymph B: Tectorial membrane |
| 4. | A: Perilymph B: Tectorial membrane C: Endolymph |
Subtopic: Sensory reception and Processing | Mechanism of hearing |
66%
Level 2: 60%+
AIPMT - 2008
Hints
Senescence as an active developmental cellular process in the growth and functioning of a flowering plant, is indicated in:
| 1. | vessels and tracheid differentiation |
| 2. | leaf abscission |
| 3. | annual plants |
| 4. | floral parts. |
Subtopic: Auxin Function | Cytokinin | Ethylene | Abscisic Acid |
66%
Level 2: 60%+
AIPMT - 2008
Hints
Vascular tissues in flowering plants develop from:
1. phellogen
2. plerome
3. periblem
4. dermatogen
Level 4: Below 35%
AIPMT - 2008
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Nitrogen-fixation in root nodules of Alnus is brought about by:
| 1. | Bradyrhizobium | 2. | Clostridium |
| 3. | Frankia | 4. | Azorhizobium |
Subtopic: Nitrogen Fixation | Genetics & Biochemistry of Nitrogen Fixation |
92%
Level 1: 80%+
AIPMT - 2008
Hints
What will happen if HCl secretion of parietal cells of gastric glands is blocked with an inhibitor?
| 1. | Gastric juice will be deficient in chymosin |
| 2. | Gastric juice will be deficient in pepsinogen |
| 3. | In the absence of HCl secretion, inactive pepsinogen is not converted into the active enzyme pepsin |
| 4. | Enterokinase will not be released from the duodenal mucosa and so trypsinogen is not converted to trypsin |
Subtopic: Gastric Secretions |
86%
Level 1: 80%+
AIPMT - 2008
Hints
Electrons from excited chlorophyll molecule of photosystem-ll are accepted first by:
1. cytochrome-b
2. cytochrome-f
3. quinone
4. ferredoxin
Subtopic: Photosystems |
68%
Level 2: 60%+
AIPMT - 2008
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Trichoderma harzianum has proved to be a useful micro-organism for:
1. bioremediation of contaminated soils
2. reclamation of wastelands
3. gene transfer in higher plants
4. biological control of soil-borne plant pathogens
Subtopic: Microbes in Biocontrol Agent |
88%
Level 1: 80%+
AIPMT - 2008
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Links
Which type of white blood cells are concerned with the release of histamine and the natural anticoagulant heparin?
| 1. | Neutrophils | 2. | Basophils |
| 3. | Eosinophils | 4. | Monocytes |
Subtopic: Blood: White Blood Cells |
90%
Level 1: 80%+
AIPMT - 2008
Hints
Which one of the following in birds, indicates their reptilian ancestry?
| 1. | Scales on their hind limbs |
| 2. | Four-chambered heart |
| 3. | Two special chambers crop and gizzard in their digestive tract |
| 4. | Eggs with a calcareous shell |
Subtopic: Study of Reptilia | Study of Aves & Mammals |
Level 3: 35%-60%
AIPMT - 2008
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