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This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 201. |
Which one is the correct sequence of a cell cycle?A. `G_(2)rarrMrarrG_(1)rarrS`B. `SrarrG_(2)rarrMrarrG_(1)`C. `G_(1)rarrSrarrG_(2)rarrM`D. `MrarrG_(1)rarrSrarrG_(2)` |
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Answer» Correct Answer - C The cell cycle starts from interphase. Interphase is the phae in the cell cycle that prepares a cell and its nucleus for division. It has three stages - `G_(1),S` and `G_(2)` M-phase is the final phase of cell cycle it represetns the phase of actual division. It consists of karyokinesis (division of nucleus) and cytokinesis (division of cell protoplast). |
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| 202. |
Which one is the correct sequence of a cell cycle?A. `G_(1),G_(2),S` and MB. `S,G_(1),G_(2)`, and MC. `G_(1),S,G_(2)` and MD. `G_(2),S,G_(1)`, and M |
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Answer» Correct Answer - c The number of different haploid cells arise by meiosis can be calculated by 2" n=number of haploid chromosome. |
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| 203. |
When synapsis is complete all along the chromosomes, the cell is said to have entered a stage calledA. DiakinesisB. DiploteneC. PachyteneD. zygotene |
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Answer» Correct Answer - C When synapsis is complete all along the chromosomes, the cell is said to have entered a stage called pachytene. |
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| 204. |
Which of the following is an event which does not occur during anaphase-I?A. Spindle fibres pull homologous chromosoes towards the opposite poles of the spindleB. The homologous chromosomes break their connection and separate out into two haploid sets or dyadsC. one such set is present at each end of the spindleD. The process of separation of chromosomes which takes place is called disengagement |
| Answer» Correct Answer - D | |
| 205. |
The stage during which cell decides to et specialised isA. S-phaseB. M-phaseC. `G_(1)`-phaseD. `G_(2)`-phase |
| Answer» Correct Answer - C | |
| 206. |
The stage of cell cycle when cell decides to undergone differentiation isA. `G_(0)`B. `G_(1)`C. `G_(2)`D. S |
| Answer» Correct Answer - A | |
| 207. |
When energy is stored and cell undergoes differentiation, the stage is calledA. `G_(1)`B. SC. `G_(0)`D. Anaphase |
| Answer» Correct Answer - C | |
| 208. |
Which is correct for meiotic cell cycle ?A. `S…G_(1)…G_(2)…M…S`B. `G_(2)…G_(1)…S…M…G_(2)`C. `G_(1)…G_(2)…S…M…G_(2)`D. `G_(1)…S…G_(2)…M…G_(1)` |
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Answer» Correct Answer - D `G_(1)…S…G_(2)…M…G_(2)` is correct sequence for meiotic cell cycle |
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| 209. |
Comment of the statement - meiosis enables the conservation of specific chromosome number of each species even through the process per se results in reduction of chromosome number ? |
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Answer» Meiosis is the mechanism by which conservation of specific chromosome number of each species is achieved across generations in sexually reproducing organism. Even though the process results in reduction of chromosome number by half, it is gradually conserved by union of male gamete `(n)` and female gamete `(n)` in next generation. Meiosis also increases the genetic variability in the population of organsims from one generation to the next. |
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| 210. |
The stage of cell cycle when cell decides to undergone differentiation isA. `G_(0)`B. `G_(1)`C. `G_(3)`D. `G_(4)` |
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Answer» Correct Answer - A The stage of cell cycle when cell decides to undergone differentiation is `G_(0)` |
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| 211. |
A : Dictyotene stage occurs in female only. R : Gametogenesis rests for a long period at diplotene stage in female.A. IF both Assertion & Reason are true and the reason followed is the correct explanation of the assertion then mark (1).B. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion then mark (2).C. If Assertion is true statement but Reason is false, then mark (3).D. If both Assertion and Reason are false statement then mark (4). |
| Answer» Correct Answer - A | |
| 212. |
Name a cell that is found arrested in diplotene stage for months and years. Comment in `2-3` lines how it completes cell cycle ? |
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Answer» Meiotic arrest at diplotene stage commonly occurs in mammalian occytes. In females, meiosis starts in the embryo and proceeds as for as diplotene, when the chromosomes become diffused and the cells are referred to as being in the dictuate stage. This arrest is under hormonal control. In many amphibian oocytes binds and insects with a long period of immaturity, the oocyte may be arrested in the dictyate stage for many years and spend a prolonged period in diplotene. This stage is characterised by formation of lampbrush chromosomers where intense RNA synthesis occurs and most of the genes in the DNA loops are actively transcrbed and expressed. |
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| 213. |
Homologous chromosomes begin to separate duringA. DiakinesisB. LeptoteneC. ZygoteneD. Diplotene |
| Answer» Correct Answer - A::D | |
| 214. |
In oocytes of some vertebrates_____stage can last for months or years.A. DiploteneB. DiakinesisC. LeptoteneD. Zygotene |
| Answer» Correct Answer - A | |
| 215. |
Refer to the given figure of cell division. Which of the following options show previous stage of this process?A. B. C. D. |
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Answer» Correct Answer - A The given represent anphase of mitotic division. Option a,b,c and d represent metaphase of mitotic divisio, telophase of mitotic division, I of meiotic division and telophase II of meiotic division. Metaphase is the previous stage of naphse of mitotic division. |
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| 216. |
Which of the following is the correct sequence ?A. Leptotene `to` Diakinesis `to` Diplotene `to` Zygotene `to` PachyteneB. Diplotene `to` Leptotene `to` Zygotene `to` Pachytene `to` DiakinesisC. Leptotene `to` Zygotene `to` Pachytene `to` Diplotene `to` DiakinesisD. Diakinesis `to` Diplotene `to` Pachytene `to` Zygotene `to` Leptotene |
| Answer» Correct Answer - A::C | |
| 217. |
Dissolution of synaptonemal complex occurs duringA. PachyteneB. LeptoteneC. DiploteneD. Diakinesis |
| Answer» Correct Answer - A::C | |
| 218. |
What does (i) and (ii) represent in the given flowchart? Perent cell `overset(M-I)rarr` 2 Daughter cells `overset(M-II)rarr` 4 Daughter cellsA. (i)=2n (ii)=nB. (i)=n (ii)=nC. (i)=n (ii) =2nD. (i)=2n (ii)=2n |
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Answer» Correct Answer - B Meiosis I consists of separation of the homologous chromosomes, each made up of two sister chormatids into two cells. Entire haploid content of chomosomes is contained in each of the resulting daughter cells. The first meiotic division therefore reduces the ploidy of the original cell by a factor of 2. Meiosis II consists of decoupling of each chormosome sister strands (chromatids) and segregating the individual chromatids into haploid daughter cells. The two cells resulting from meiosis I divide during meiosis II, creating 4 haploid daughter cells. |
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| 219. |
Refer to the the given and select the correct statement A. In stage B homologous chromosomes are interconnected and chromosomes occurs in pairs.B. Stage A is divisible into five substagesC. In stage D, chormosmes are not enclosed by a nuclear envelope.D. In stage C centromeres divide and chromosomes are single stranded. |
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Answer» Correct Answer - D In the given figure A,B,C and D represent prophase II, metaphase II, anaphase II and telophase II respectively. Prophase it is not divisible into substages rather prophase I is divisible into five substages. Chromosomes are free in metaphase II while in metaphase I homologus chormosomes are interconnected and chromosomes occur in pairs i.e, bivalents. In telophase chromosmes get enclosed by a nuclear envelope. |
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| 220. |
Which phase of prophase-I represents the transition to metaphase I ?A. DiakinesisB. LeptoteneC. DiploteneD. Zygotene |
| Answer» Correct Answer - A | |
| 221. |
Synaptonemal complex is formed duringA. PachyteneB. ZyoteneC. LeptoteneD. Diakinesis |
| Answer» Correct Answer - A::B | |
| 222. |
Crossing-over occurs in theA. LeptoteneB. DiploteneC. ZygoteneD. Pachytene |
| Answer» Correct Answer - A::D | |
| 223. |
In above sequence of figures showing different stages of cell division, the missing stage (ii) isA. B. C. D. |
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Answer» Correct Answer - A Figure (i) shows metaphase II and figure (iii) shows telophase II, Hence, the missing figure is that of anphase II. |
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| 224. |
Cell organelles replicate in/duringA. M phaseB. interphaseC. `G_(0)` phaseD. Cytokinesis |
| Answer» Correct Answer - A::B | |
| 225. |
The chromosomes are shortest and thickest duringA. AnaphaseB. MetaphaseC. TelophaseD. Interphase |
| Answer» Correct Answer - B | |
| 226. |
In plant cells during metaphase, chromosomes areA. shortened due to slow removal of proteinaceous monomersB. pulled along behind the centromeres towards the polesC. irregularly arranged on the equatorial planeD. arranged peripherally on the equatorial plane |
| Answer» Correct Answer - C | |
| 227. |
Which of the following the correct sequence of cell division ?A. Analphase `to` metaphase `to` Telophase `to` ProphaseB. Prophase `to` Telophase `to` Anaphase `to` MetaphaseC. Analphase `to` Prophase `to` Metaphase `to` TelophaseD. Prophase `to` Metaphase `to` Analphase `to` Telophase |
| Answer» Correct Answer - A::D | |
| 228. |
Two chromatids are hold together atA. Spindle fibreB. MicrotubuleC. CentromereD. Kinetochore |
| Answer» Correct Answer - A::C | |
| 229. |
During metaphase, the chromosomes align themselves at theA. PeripheryB. EquatorC. Cell plateD. Furrow |
| Answer» Correct Answer - A::B | |
| 230. |
The chromosomes align at the equator duringA. InterphaseB. ProphaseC. MetaphaseD. Telophase |
| Answer» Correct Answer - D | |
| 231. |
The given event occurs in A. prophase-IB. prophase-IIC. prophase of mitosisD. prophase and metaphase of mitosis |
| Answer» Correct Answer - A | |
| 232. |
Choose the diagram which correctly depicts anaphase IA. B. C. D. |
| Answer» Correct Answer - D | |
| 233. |
Chiasmata was first discovered byA. Morgan in DrosophilaB. Beadle in NeurosporaC. Johnson in amphibiansD. hammerling in Acetabularia |
| Answer» Correct Answer - C | |
| 234. |
Chiasmata formation takes place duringA. Prophase I (Diplotene)B. Metaphase IC. Anaphase IID. Telophase I |
| Answer» Correct Answer - a | |
| 235. |
Chiasmata are first seen inA. LeptoteneB. ZygoteneC. PachyteneD. Diplotene |
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Answer» Correct Answer - D Chaismata are first seen in diplotene. |
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| 236. |
In meiosisA. First division is reductionalB. First division is equationalC. Second division is reductionalD. None of the above |
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Answer» Correct Answer - A In meiosis first division is reductional and second in equatoral. |
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| 237. |
Prophase -I is subdivided into five phases based onA. chromosomal movementB. chromosomal alignmentC. chromosomal behaviourD. chromosomal structure |
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Answer» Correct Answer - C Prophase-I is subdivided into five phases based on chromosomal behaviour. |
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| 238. |
The following events occur during the various phases of the cell cycle. Name the phase against each of the events. (a) Disintegration of nuclear membrane..... (b) Appearance of nucleolus..... (c) Division of centromere .... (d) Replication of DNA... |
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Answer» (a) Prophase (b) Telophase (c) Anaphase (d) S-phase |
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| 239. |
Assertion:Mitotic divisions results in a continous grouth of plants throughout their life. Reason: Plants have meristematic tissue-the apical and lateral cambium.A. If both assertion and reason are true and the reason is the correct explanation of the assertion.B. If both assertion and reason are true but reason is not the correct explanation of the assertion.C. If assertion is true but reason is false.D. If both assertion and reason are false. |
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Answer» Correct Answer - A Mitotic divisions results in a continous grouth of plants throughout their life as plants have meristematic tissue - the apical and lateral cambium. |
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| 240. |
Which of the following pstatements is correct ?A. Animals can sow mitotic divisions in both haploid and diploid cells.B. After S phase the number of chromosomes becomes double i.e., 2n to 4n.C. During the `G_(2)` phase, proteins are synthesised in preparation for mitosis while cell growth continues.D. S or synthesis phase marks the period during which RNA synthesis takes place. |
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Answer» Correct Answer - C Animals can show mitotic divisions only in diploid cells. After S phase the number of chromosmes remains the same i.e., 2n S or synthesis phase marks the period during which DNA systhesis takes place. |
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| 241. |
The thread-like structures, which begin rediating from each centromere by the end of prophase areA. kinetochore microtubulesB. polar microtubulesC. aster microtubulesD. spindle microtubules |
| Answer» Correct Answer - A | |
| 242. |
Which of the two events restore the normal number of chromosomes in life cycle?A. Mitosis and MeiosisB. Meiosis and fertilisationC. Fertilisation and mitosisD. Only meiosis |
| Answer» Correct Answer - B | |
| 243. |
Division of nucleus is indirect inA. Mitosis and MeiosisB. Meiosis and fertilisationC. AmitosisD. Both (1) and (2) |
| Answer» Correct Answer - A | |
| 244. |
In which phase of cell division is oocyte arrested ?A. anaphase IIB. prophase IC. interphaseD. both prophase I and II |
| Answer» Correct Answer - B | |
| 245. |
The process of crossing over is assisted by which of the following enzymes?A. EndonucleaseB. PolymeraseC. LigaseD. Both a and c |
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Answer» Correct Answer - D Crossing over (recombination) occurs during pachytene. Recombination involves mutual exchange of the corresponding segments of non-sister chromatids of homologous chromosomes. It takes place by breakage and retunion of chromatid segements. Breakage, called nickling. is assisted by an enzyme endonuclease and reunion, terned annealing, is aided by an enzyme ligase. |
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| 246. |
Disjunction refers toA. the separation of homologous chromosomes at anaphase IB. the type of chromosomal aberration in which there is loss of a part of a chromosomeC. incopatibility in fungi and other thallophytesD. modification of gene action by a nonallelic gene. |
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Answer» Correct Answer - A The homologous chromosomes break their connections and separate out during anaphase I of meiosis I. This process of separation is named as disjunction. |
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| 247. |
A single cell containing large number of nuclei is calledA. SyncytiumB. Cell plateC. MonadD. Bivalent |
| Answer» Correct Answer - A | |
| 248. |
The figure given below shows a cell undergoing meiosis. Which of the option below shows the next stage in the process?A. B. C. D. |
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Answer» Correct Answer - B The given figure is showing diplotene stage of prophase I of meiosis I. Next stage would be metaphase I. |
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| 249. |
A type of cell division which reduces chromosomes number to half isA. MitosisB. Multiple fissionC. FragmentationD. Meiosis |
| Answer» Correct Answer - D | |
| 250. |
The number of chromosomes is reduced to half duringA. mitosisB. meiosis iIIC. Meiosis involves pairing of non-homologous chromosomes and recombination between them.D. fertilisation. |
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Answer» Correct Answer - C |
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