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
Which two of the above were the main causes of fish mortality in the lake?
2. 3, 4
3. 1, 3
4. 1, 2
Subtopic: Water Pollution: I | Water Pollution: II | Water Pollution |
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: Inner Ear: Cochlea (OLD NCERT) |
69%
From NCERT
AIPMT - 2008
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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 |
67%
AIPMT - 2008
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Vascular tissues in flowering plants develop from:
1. phellogen
2. plerome
3. periblem
4. dermatogen
Subtopic: Meristematic Tissue: Shoot Apex (OLD NCERT) |
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 |
94%
From NCERT
AIPMT - 2008
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NEET 2025 - Target Batch
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NEET 2025 - Target Batch
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 |
87%
From NCERT
AIPMT - 2008
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NEET 2025 - Target Batch
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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%
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%
From NCERT
AIPMT - 2008
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NEET 2025 - Target Batch
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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 |
89%
From NCERT
AIPMT - 2008
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NEET 2025 - Target Batch
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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 |
AIPMT - 2008
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