In angiosperms, the correct sequence of events leading to the formation of female gametophyte in the ovule is:
A.
3 successive free nuclear divisions in functional megaspore.
B.
Degeneration of 3 megaspores
C.
Meiotic division in megaspore mother cell
D.
Migration of 3 nuclei towards each pole.
E.
Formation of a wall resulting in seven celled embryosac.
Choose the correct answer from the options given below:
1.
(A), (B), (C), (D), (E)
2.
(C), (E), (A), (D), (B)
3.
(B), (C), (A), (D), (E)
4.
(C), (B), (A), (D), (E)
Subtopic: Pistil: Ovule | Pistil: Female Gametophyte |
77%
Level 2: 60%+
NEET - 2023
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Which of the following statements is true?
| 1. | All pteridophytes exhibit haplo-diplontic pattern. |
| 2. | Seed bearing plants follow haplontic pattern. |
| 3. | Most algal genera are diplontic. |
| 4. | Most bryophytes do not have haplo-diplontic life cycle. |
68%
Level 2: 60%+
NEET - 2023
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Which of the following statement is incorrect about Agrobacterium tumefaciens ?
| 1. | It is used to deliver gene of interest in both prokaryotic as well as eukaryotic host cells. |
| 2. | 'Ti' plasmid from Agrobacterium tumefaciens used for gene transfer is not pathogenic to plant cells. |
| 3. | It transforms normal plant cells into tumor cells. |
| 4.. | It delivers 'T-DNA' into plant cell. |
Subtopic: Transforming Plant & Animal Cell |
61%
Level 2: 60%+
NEET - 2023
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Consider the following plant tissues:
(A) Axillary buds
(B) Fascicular vascular cambium
(C) Interfascicular cambium
(D) Cork cambium
(E) Intercalary meristem
Identify the lateral meristems among the above:
(A) Axillary buds
(B) Fascicular vascular cambium
(C) Interfascicular cambium
(D) Cork cambium
(E) Intercalary meristem
Identify the lateral meristems among the above:
| 1. | (A), (C) and (D) only | 2. | (B), (C) and (D) only |
| 3. | (A), (B), (C) and (E) only | 4. | (A), (B), (D) and (E) only |
83%
Level 1: 80%+
NEET - 2023
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Match List-I with List-II
Choose the correct answer from the options given below:
| List-I | List-II | ||
| (A) | Kanamycin | (I) | Delivers genes into animal cells |
| (B) | ClaI | (II) | Selectable marker |
| (C) | Disarmed retroviruses | (III) | Restriction site |
| (D) | Kanamycin Rgene | (IV) | Antibiotic resistance |
Choose the correct answer from the options given below:
| Options: | (A) | (B) | (C) | (D) |
| 1. | (II) | (III) | (I) | (IV) |
| 2. | (III) | (I) | (IV) | (II) |
| 3. | (IV) | (III) | (I) | (II) |
| 4. | (II) | (IV) | (I) | (III) |
Subtopic: Cloning Vector |
55%
Level 3: 35%-60%
NEET - 2023
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Given below are two statements:
In the light of the above statements, choose the correct answer from the options given below:
1. Statement I is true but Statement II is false
2. Statement I is false but Statement II is true
3. Both Statement I and Statement II are true
4. Both Statement I and Statement II are false
| I: | The process of copying genetic information from one strand of the DNA into RNA is termed as transcription |
| II: | A transcription unit in DNA is defined primarily by the three regions in the DNA i.e. a promoter, the structural gene and a terminator. |
1. Statement I is true but Statement II is false
2. Statement I is false but Statement II is true
3. Both Statement I and Statement II are true
4. Both Statement I and Statement II are false
Subtopic: Transcription |
89%
Level 1: 80%+
NEET - 2023
Hints
Which scientist conducted an experiment with 32p and 35s labelled phages for demonstrating that DNA is the genetic material?
1. James D. Watson and F.H.C Crick
2. A.D. Hershey and M.J. Chase
3. F. Griffith
4. O.T. Avery, C.M. MacLeod and M. McCarty
1. James D. Watson and F.H.C Crick
2. A.D. Hershey and M.J. Chase
3. F. Griffith
4. O.T. Avery, C.M. MacLeod and M. McCarty
Subtopic: Search for Genetic Material |
84%
Level 1: 80%+
NEET - 2023
Hints
A certain plant homozygous for yellow seeds and red flowers was crossed with a plant homozygous for green seeds and white flowers. The F1 plants had yellow seeds and pink flowers. The F1 plants were selfed to get F2 progeny. Assuming independent assortment of the two characters, how many phenotypic categories are expected for these characters in the F2 generation?
| 1. | 9 | 2. | 16 |
| 3. | 4 | 4. | 6 |
Subtopic: Dihybrid Cross: General Consideration |
Level 3: 35%-60%
NEET - 2023
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During which stages of mitosis and meiosis, respectively, does the centromere of each chromosome split?
| 1. | Metaphase, Metaphase II | 2. | Prophase, Telophase I |
| 3. | Telophase, Anaphase I | 4. | Anaphase, Anaphase II |
Subtopic: Cell Division: Mitosis (Karyokinesis) | Cell Cycle: Meiosis II |
89%
Level 1: 80%+
NEET - 2023
Hints
Which of the following statements is not correct?
| 1. | Phase of cell elongation of plant cells is characterized by increased vacuolation. |
| 2. | Cells in the meristematic phase of growth exhibit abundant plasmodesmatal connections |
| 3. | Plant growth is generally determinate |
| 4. | Plant growth is measurable |
Subtopic: Growth |
80%
Level 1: 80%+
NEET - 2023
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