Which of the following can be expected if scientists succeed in introducing apomictic gene into hybrid varieties of crops ?
| 1. | Polyembryony will be seen and each seed will produce many plantlets |
| 2. | Seeds of hybrid plants will show longer dormancy |
| 3. | Farmers can keep on using the seeds produced by the hybrids to raise new crop year after year |
| 4. | There will be segregation of the desired characters only in the progeny |
Subtopic: Apomixis & Polyembryony |
84%
Level 1: 80%+
NEET - 2022
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Frugivorous birds are found in large numbers in tropical forests mainly because of :
| 1. | lack of niche specialisation |
| 2. | higher annual rainfall |
| 3. | availability of fruits throughout the year |
| 4. | temperature conducive for their breeding |
Subtopic: Biodiversity Patterns |
74%
Level 2: 60%+
NEET - 2022
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Which type of substance would face difficulty to pass through the cell membrane?
| 1. | Substance with hydrophobic moiety |
| 2. | Substance with hydrophilic moiety |
| 3. | All substance irrespective of hydrophobic and hydrophilic moiety |
| 4. | Substance soluble in lipids |
Subtopic: Cell Membrane |
64%
Level 2: 60%+
NEET - 2022
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What is the expected percentage of F2 progeny with yellow and inflated pod in dihybrid cross experiment involving pea plants with green coloured, inflated pod and yellow coloured constricted pod?
| 1. | 100% | 2. | 56.25% |
| 3. | 18.75 % | 4. | 9% |
Subtopic: Monohybrid Cross: 1 |
58%
Level 3: 35%-60%
NEET - 2022
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Read the following statements and identify the characters related to the alga shown in the diagram:
Choose the correct answer from the options given below :
| (a) | It is a member of Chlorophyceae |
| (b) | Food is stored in the form of starch |
| (c) | It is a monoecious plant showing oogonium and antheridium |
| (d) | Food is stored in the form of laminarin or mannitol |
| (e) | It shows dominance of pigments chlorophyll a, c and Fucoxanthin. |
Choose the correct answer from the options given below :
| 1. | (a) and (b) only | 2. | (a), (b) and (c) only |
| 3. | (a), (c) and (d) only | 4. | (c), (d) and (e) only |
Subtopic: Chlorophyceae: Green Algae |
57%
Level 3: 35%-60%
NEET - 2022
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Identify the correct statements regarding chemiosmotic hypothesis :
Choose the correct answer from the options given below:
| (a) | Splitting of the water molecule takes place on the inner side of the membrane. |
| (b) | Protons accumulate within the lumen of the thylakoids. |
| (c) | Primary acceptor of electron transfers the electrons to an electron carrier. |
| (d) | NADP reductase enzyme is located on the stroma side of the membrane. |
| (e) | Protons increase in number in stroma. |
Choose the correct answer from the options given below:
| 1. | (a), (b) and (e) | 2. | (a), (b) and (d) |
| 3. | (b), (c) and (d) | 4. | (b), (c) and (e) |
82%
Level 1: 80%+
NEET - 2022
Hints
If a female individual is with a small round head, furrowed tongue, partially open mouth and broad palm with characteristic palm crease. Also, the physical, psychomotor and mental development is retarded. The karyotype analysis of such an individual will show:
| 1. | 47 chromosomes with XXY sex chromosomes |
| 2. | 45 chromosomes with XO sex chromosomes |
| 3. | 47 chromosomes with XYY sex chromosomes |
| 4. | Trisomy of chromosome 21 |
Subtopic: Non - Disjunction & Aneuploidy | Sex Aneuploidy - Turner & Klinefelter Syndrome |
89%
Level 1: 80%+
NEET - 2022
Hints
Identify the correct sequence of events during Prophase I of meiosis :
Choose the correct answer from the options given below :
| (a) | Synapsis of homologous chromosomes |
| (b) | Chromosomes become gradually visible under microscope |
| (c) | Crossing over between non-sister chromatids of homologous chromosomes |
| (d) | Terminalisation of chiasmata (e) Dissolution of synaptonemal complex |
Choose the correct answer from the options given below :
| 1. | (a), (b), (c), (d), (e) | 2. | (b), (c), (d), (e), (a) |
| 3. | (b), (a), (c), (e), (d) | 4. | (a), (c), (d), (e), (b) |
Subtopic: Cell Cycle: Meiosis I |
78%
Level 2: 60%+
NEET - 2022
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The enzyme (a) is needed for isolating genetic material from plant cells and enzyme (b) for isolating genetic material from fungus. Choose the correct pair of options from the following :
| 1. | (a) Cellulase (b) Protease | 2. | (a) Cellulase (b) Chitinase |
| 3. | (a) Chitinase (b) Lipase | 4. | (a) Cellulase (b) Lipase |
Subtopic: Separation and Isolation of DNA fragments |
92%
Level 1: 80%+
NEET - 2022
Hints
Match the List-I with List-II
Choose the correct answer from the options given below :
| List-I | List-II |
| (a) Carbon dissolved in oceans | (i) 55 billion tons |
| (b) Annual fixation of carbon through photosynthesis | (ii) 71% |
| (c) PAR captured by plants | (iii) \(4 \times 10^3 \)kg |
| (d) Productivity of oceans | (iv) 2 to 10% |
Choose the correct answer from the options given below :
| (a) | (b) | (c) | (d) | |
| 1. | (ii) | (iv) | (iii) | (i) |
| 2. | (iii) | (iv) | (ii) | (i) |
| 3. | (ii) | (iii) | (iv) | (i) |
| 4. | (iii) | (ii) | (i) | (iv) |
Subtopic: Ecosystem Productivity |
90%
Level 1: 80%+
NEET - 2022
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