Heterophyllous development in response to environment is an example of which of the following phenomena ?
1. Dedifferentiation
2. Elasticity
3. Redifferentiation
4. Plasticity
1. Dedifferentiation
2. Elasticity
3. Redifferentiation
4. Plasticity
Subtopic: Development |
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In racemose inflorescence, __________________.
| 1. | the main axis terminates in a flower |
| 2. | the growth is limited |
| 3. | flowers are borne in an acropetal succession |
| 4. | flowers are solitary |
Subtopic: Inflorescence |
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Which one of the following disorders is caused by the substitution of Glutamic acid (Glu) by Valine (Val) at the sixth position of the beta globin chain of the haemoglobin molecule?
1. Haemophilia
2. Thalassemia
3. Sickle-cell anaemia
4. Phenylketonuria
1. Haemophilia
2. Thalassemia
3. Sickle-cell anaemia
4. Phenylketonuria
Subtopic: Mendelian Disorders: Sickle Cell Anemia |
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Match List-I with List-II:
Choose the correct answer from the options given below:
1. A-II, B-IV, C-III, D-I
2. A-I, B-III, C-II, D-IV
3. A-II, B-I, C-III, D-IV
4. A-I, B-IV, C-III, D-II
| List-I | List-II | ||
| A. | Incomplete dominance | I. | Human skin colour |
| B. | Co-dominance | II. | Inheritance of flower colour in Antirrhinum sp. |
| C. | Pleiotropy | III. | Phenylketonuria disease in humans |
| D. | Polygenic inheritance | IV. | ABO blood groups |
1. A-II, B-IV, C-III, D-I
2. A-I, B-III, C-II, D-IV
3. A-II, B-I, C-III, D-IV
4. A-I, B-IV, C-III, D-II
Subtopic: Miscellaneous |
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Arranging the following in the correct developmental sequence related to microsporogenesis:
Choose the correct answer from the options given below:
1. D, A, C, B
2. B, D, C, A
3. B, D, A, C
4. A, D, C, B
| A. | Microspore tetrads |
| B. | Sporogenous tissue |
| C. | Pollen grains |
| D. | Pollen mother cells |
1. D, A, C, B
2. B, D, C, A
3. B, D, A, C
4. A, D, C, B
Subtopic: Stamen: Microsporangium |
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Arrange the following steps of DNA fingerprinting in a correct sequence.
Choose the correct answer from the options given below:
1. A, E, C, B, D
2. A, E, B, C, D
3. A, B, D, C, E
4. A, D, B, E, C
| A. | Isolation of DNA and its digestion by restriction endonucleases. |
| B. | Hybridisation using a labelled VNTR probe. |
| C. | Transferring of separated DNA fragments to synthetic membranes. |
| D. | Detection of hybridised DNA fragments by autoradiography. |
| E. | Separation of DNA fragments by electrophoresis. |
1. A, E, C, B, D
2. A, E, B, C, D
3. A, B, D, C, E
4. A, D, B, E, C
Subtopic: DNA Fingerprinting |
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Exploring molecular, genetic and species-level diversity for products of economic importance is called:
1. Biomagnification
2. Biofortification
3. Bioremediation
4. Bioprospecting
1. Biomagnification
2. Biofortification
3. Bioremediation
4. Bioprospecting
Subtopic: Biodiversity Conservation |
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Which of the following statements are true with reference to the sex-determination in honeybees?
Choose the correct answer from the options given below:
1. B, C, D and E only
2. A, B, C and D only
3. A, B, D and E only
4. A, B, C and E only
| A. | An offspring formed from the union of a sperm and an egg, develops as a female (queen or worker). |
| B. | An unfertilized egg develops as a male by parthenogenesis. |
| C. | A male has half the number of chromosomes than that of a female. |
| D. | Males produce sperm by meiosis. |
| E. | Honeybees have a haplodiploid sex-determination system. |
1. B, C, D and E only
2. A, B, C and D only
3. A, B, D and E only
4. A, B, C and E only
Subtopic: Sex Determination |
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Identify the correct sequence of steps in each cycle of Polymerase Chain Reaction :
1. Denaturation → Annealing → Extension
2. Denaturation → Extension → Annealing
3. Extension → Annealing → Denaturation
4. Annealing → Denaturation → Extension
1. Denaturation → Annealing → Extension
2. Denaturation → Extension → Annealing
3. Extension → Annealing → Denaturation
4. Annealing → Denaturation → Extension
Subtopic: Polymerase Chain Reaction: PCR |
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Which of the following statements are correct with respect to DNA separation, isolation and visualization ?
Choose the correct answer from the options given below:
| A. | The cutting of DNA is done by molecular scissors. |
| B. | The DNA fragments separate according to their size in an agarose gel, upon electrophoresis. |
| C. | The separated DNA fragments can be seen without staining when exposed to UV light. |
| D. | The separated DNA fragments, when stained with ethidium bromide, can be seen in visible light. |
| 1. | A and D only | 2. | B and D only |
| 3. | B and C only | 4. | A and B only |
Subtopic: Separation and Isolation of DNA fragments |
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