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 |
80%
Level 1: 80%+
NEET - 2022
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Read the following statements and identify the characters related to the alga shown in the diagram:
| 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. |
| 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: I |
Level 3: 35%-60%
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.
1. lack of niche specialisation.
2. higher annual rainfall.
3. availability of fruits throughout the year.
4. temperature conducive for their breeding.
Subtopic: Components & Types of Ecosystems | Ecosystem Productivity |
68%
Level 2: 60%+
NEET - 2022
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Which type of substances would face difficulty in passing through the cell membrane?
| 1. | Substances with hydrophobic moiety |
| 2. | Substances with hydrophilic moiety |
| 3. | All substances, irrespective of hydrophobic and hydrophilic moiety |
| 4. | Substances which are soluble in lipids |
Subtopic: Cell Membrane |
54%
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:
1. (a), (b) and (e)
2. (a), (b) and (d)
3. (b), (c) and (d)
4. (b), (c) and (e)
| (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) | The primary acceptor of electrons 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. |
1. (a), (b) and (e)
2. (a), (b) and (d)
3. (b), (c) and (d)
4. (b), (c) and (e)
Subtopic: Chemiosmotic hypothesis |
76%
Level 2: 60%+
NEET - 2022
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If a female individual is with 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 |
87%
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 a 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 |
84%
Level 1: 80%+
NEET - 2022
Hints
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
1. (a) Cellulase (b) Protease
2. (a) Cellulase (b) Chitinase
3. (a) Chitinase (b) Lipase
4. (a) Cellulase (b) Lipase
Subtopic: General Design of an rDNA experiment |
93%
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 |
86%
Level 1: 80%+
NEET - 2022
Hints
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: Dihybrid Cross Analysis |
55%
Level 3: 35%-60%
NEET - 2022
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