Nitrogen-fixation in root nodules of Alnus is brought about by:
1.
Bradyrhizobium
2.
Clostridium
3.
Frankia
4.
Azorhizobium
| 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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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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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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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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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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Subtopic: Endosperm |
71%
AIPMT - 2008
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In humans, at the end of the first meiotic division, the male germs cells differentiate into the:
1. primary spermatocytes
2. secondary spermatocytes
3. spermatids
4. spermatogonia
Subtopic: Seminiferous Tubules & Spermatogenesis | Spermiogenesis/Sperm Structure/Hormonal Regulation |
71%
From NCERT
AIPMT - 2008
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In the DNA molecule:
| 1. | The total amount of purine nucleotides and pyrimidine nucleotides is not always equal |
| 2. | There are two strands, which run parallel in the 5' → 3’ direction |
| 3. | The proportion of adenine in relation to thymine varies with the organism |
| 4. | There are two strands, which run antiparallel - one in 5' → 3’ direction and the other in 3’→ 5’ |
Subtopic: DNA Double Helix |
90%
From NCERT
AIPMT - 2008
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Consider the following four measures (A.D) that could be taken to successfully grow chickpeas in an area where bacterial blight disease is common:
| (A) | spray with Bordeaux mixture |
| (B) | control of the insect vector of the disease pathogen |
| (C) | use of only disease-free seeds |
| (D) | use of varieties resistant to the disease |
Which two of the above measures can control the disease?
1. B and C
2. A and B
3. C and D
4. A and D
Subtopic: Breeding for Disease Resistance (OLD NCERT) |
54%
AIPMT - 2008
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