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MCQOPTIONS
This section includes 14620 Mcqs, each offering curated multiple-choice questions to sharpen your NEET knowledge and support exam preparation. Choose a topic below to get started.
| 1751. |
Mature nerve cells cannot undergo cell division. These cells are probably considered in: |
| A. | \[{{G}_{2}}-phase\] |
| B. | S-phase |
| C. | Mitosis |
| D. | \[{{G}_{0}}-phase\] |
| Answer» E. | |
| 1752. |
Meiosis which occur at the time of spore formation is called. |
| A. | Zygotic meiosis |
| B. | Haplontic meiosis |
| C. | Terminal meiosis |
| D. | Intermediate meiosis |
| Answer» E. | |
| 1753. |
Choose the event of cell cycle which shows the importance of synapsis and the formation of chiasmata. |
| A. | An increase in the variation of progeny occurs. |
| B. | Reciprocal exchange of chromosomal sections occurs. |
| C. | The DNA on homologous chromosomes mix. |
| D. | All of the above |
| Answer» E. | |
| 1754. |
In pachytene stage of meiosis the chromosomes appear: |
| A. | Single stranded |
| B. | Double stranded |
| C. | Three stranded |
| D. | Four stranded |
| Answer» E. | |
| 1755. |
When synapsis is complete all along the chromosome, the cell is said to have entered a stage called: |
| A. | Zygotene |
| B. | Pachytene |
| C. | Diplotene |
| D. | Diakinesis |
| Answer» C. Diplotene | |
| 1756. |
Cell division in blue green algae is similar to that in: |
| A. | Bacteria |
| B. | Brown algae |
| C. | Green algae |
| D. | Higher plants |
| Answer» B. Brown algae | |
| 1757. |
Match the terms (given in column-I) with their explanation (given in column-II) and choose the correct combination from the options given below Column-I (Terms) Column-II (Explanation) A. Terminalization I. Pairing of homolologous B. Synapsis II. Point of attachment between homologous chromosomes. C. Chiasmata III. Nuclear protein complex that helps in adherence of sister chromatids and then homologous chromosomes. D. Synaptonemal complex IV. Shifting of chiasmata outwards complex towards the ends of a bivalent. |
| A. | A - IV; B - I; C - II; D - III |
| B. | A-II; B - III; C - IV; D - I |
| C. | A - II; B - IV; C - III; D - I |
| D. | A - IV; B - I; C - III; D - II |
| Answer» B. A-II; B - III; C - IV; D - I | |
| 1758. |
Pick out the correct sequence of two main events in mitosis. |
| A. | Karyokinesis is followed by cytokinesis. |
| B. | Cytokinesis is followed by karyokinesis. |
| C. | Karyokines is followed by separation of the daughter cells. |
| D. | Cytokinesis is followed by separation of the daughter cells. |
| Answer» B. Cytokinesis is followed by karyokinesis. | |
| 1759. |
Which of the following statements related to stage of the cell cycle are correct? (i) It is a quiescent stage. (ii) In this phase, cell cycle is stopped. (iii) \[{{G}_{0}}\] cells do not grow or proliferate but metabolically active. (iv) go cells can divide in response to some stimulus. |
| A. | (i) and (ii) |
| B. | (i), (ii) and (iii) |
| C. | Only (i) and (iv) |
| D. | All of the above |
| Answer» E. | |
| 1760. |
During pachytene stage of meiosis, the chromosomes appear: |
| A. | Single stranded |
| B. | Four stranded |
| C. | Six stranded |
| D. | Eight stranded |
| Answer» C. Six stranded | |
| 1761. |
Which of the following does not lead to genetic variability? |
| A. | random fertilization |
| B. | crossing over during meiosis. |
| C. | division of chromosomes during anaphase of mitosis. |
| D. | orientation of chromosomes during metaphase I of meiosis. |
| Answer» D. orientation of chromosomes during metaphase I of meiosis. | |
| 1762. |
Most cells divide if they receive the proper signal at a checkpoint in the ____ phase of the cell cycle. |
| A. | M |
| B. | \[{{G}_{1}}\] |
| C. | S |
| D. | \[{{G}_{2}}\] |
| Answer» C. S | |
| 1763. |
Centromere is required for: |
| A. | Movement of chromosomes towards poles |
| B. | Cytoplasmic cleavage |
| C. | Crossing over |
| D. | Transcription |
| Answer» B. Cytoplasmic cleavage | |
| 1764. |
In telophase of mitosis, the mitotic spindle breaks down and nuclear membranes form. This is essentially the opposite of what happens |
| A. | Prophase |
| B. | Interphase |
| C. | Metaphase |
| D. | S phase |
| Answer» B. Interphase | |
| 1765. |
Prophase is longer in: |
| A. | Mitosis |
| B. | Meiosis |
| C. | Equal in both |
| D. | Amitosis |
| Answer» C. Equal in both | |
| 1766. |
In meiosis, actual haploidy in terms of DNA comes in: |
| A. | Metaphase-I |
| B. | Anaphase-II |
| C. | Anaphase-I |
| D. | Interkinesis |
| Answer» B. Anaphase-II | |
| 1767. |
Replication of centriole occurs during: |
| A. | Early anaphase |
| B. | Mid metaphase |
| C. | Late metaphase |
| D. | Interphase |
| Answer» E. | |
| 1768. |
Chiasmata are formed during meiosis: |
| A. | Before metaphase I |
| B. | after metaphase I |
| C. | During prophase II |
| D. | during metaphase II |
| Answer» B. after metaphase I | |
| 1769. |
At what phase of meiosis there are two cells, each with sister chromatids aligned at the spindle equator? |
| A. | Anaphase II |
| B. | Metaphase II |
| C. | Metaphase I |
| D. | Anaphase I |
| Answer» C. Metaphase I | |
| 1770. |
Who stated that new cells develop from pre-existing cells? |
| A. | Remak |
| B. | Virchow |
| C. | Prevost and Dumas |
| D. | Strasburger |
| Answer» C. Prevost and Dumas | |
| 1771. |
Match the column-I and column-II and choose the correct option. Column-I Column-I A. Chromosomes in matching pairs are called I. Metaphase plate B. In metosis chromosomes is copied and II. Homologous C. Precursor for cell wall formation that represents the middle lamella between the wall of two adjacent cells is called III. Cell plate D. The plane of alignment of chromosomes at metaphase is called IV. Cell divides to give two daughter cells. |
| A. | A - II; B - IV; C - III; D - I |
| B. | A - IV; B - III; C - I; D - II |
| C. | A - I; B - IV; C - II; D - III |
| D. | A - III; B - II; C - IV; D - I |
| Answer» B. A - IV; B - III; C - I; D - II | |
| 1772. |
Non-Sister chromatids: |
| A. | Cross over during prophase I of meiosis. |
| B. | Separate during the first meiotic division. |
| C. | Are produced during S phase between cell divisions. |
| D. | Cross over during prophase II of meiosis. |
| Answer» B. Separate during the first meiotic division. | |
| 1773. |
Meiosis and mitosis differ from each other because in meiosis: |
| A. | The four nuclei formed are not similar to parental ones. |
| B. | Homologous chromosomes pair are exchange parts. |
| C. | Number of chromosomes gets halved. |
| D. | All of the above |
| Answer» E. | |
| 1774. |
In plants, active mitosis occurs in: |
| A. | Cambium |
| B. | Leaf tip |
| C. | Root base |
| D. | Mid vein |
| Answer» C. Root base | |
| 1775. |
Chromosomes in salivary gland cells of Drosophila larvae are: |
| A. | Polytene |
| B. | Lampbrush type |
| C. | \[\beta -type\] |
| D. | Normal type |
| Answer» B. Lampbrush type | |
| 1776. |
A drug called colchicine is shown to interfere specially with spindle microtubules formation during mitosis. This would result in: |
| A. | dehydration of chromosomes |
| B. | despiralisation of chromosomes |
| C. | arrest of chromosome movements |
| D. | arrest of centrioles movements |
| Answer» D. arrest of centrioles movements | |
| 1777. |
A plant has number of chromosome groups arranged at equatorial plane of metaphase-I whose 2n = 50; the number of chromosomes visible will be: |
| A. | 100 |
| B. | 25 |
| C. | 50 |
| D. | 75 |
| Answer» D. 75 | |
| 1778. |
Cell division is a normal process in organisms, but sudden and rapid mitosis of cells in an organ may result into: |
| A. | New organ |
| B. | Gastrula |
| C. | Zygote |
| D. | Cancer |
| Answer» E. | |
| 1779. |
In \[{{\operatorname{G}}_{1}}-phase\] of cell division: |
| A. | RNA and proteins are synthesised for cell growth and subsequent DNA replication. |
| B. | DNA and proteins are synthesised. |
| C. | Formation of RNA and protein continues for spindle formation and cell growth. |
| D. | Cell undergoes duplication. |
| Answer» B. DNA and proteins are synthesised. | |
| 1780. |
If there are 22 chromosomes in the nucleus of a toad skin cell, a toad egg would contain_____ chromosomes. |
| A. | 22 |
| B. | 44 |
| C. | 11 |
| D. | 33 |
| Answer» D. 33 | |
| 1781. |
Which of the following is not a function of mitotic cell division in animals? |
| A. | Asexual reproduction |
| B. | Growth |
| C. | Repair of damaged organs |
| D. | Production of gametes |
| Answer» E. | |
| 1782. |
Which of the following is correct for the mitotic spindle? |
| A. | It is composed of actin and myosin microfilaments. |
| B. | It is composed of kinetochores at the metaphase plate. |
| C. | It is composed of microtubules, which help to separate the chromosomes to opposite poles of the cell. |
| D. | It originates only at the centrioles in the centrosomes. |
| Answer» D. It originates only at the centrioles in the centrosomes. | |
| 1783. |
During which stages (or prophase I substages) of meiosis do you expect to find the bivalents and DNA replication respectively? |
| A. | Pachytene and interphase (between two meiotic divisions). |
| B. | Pachytene and interphase (just prior to prophase I). |
| C. | Pachytene and S phase (of interphase just prior to prophase I). |
| D. | Zygotene and S phase (of interphase prior to prophase I). |
| Answer» E. | |
| 1784. |
A cell is bound to divide, if it has entered: |
| A. | \[{{\operatorname{G}}_{2}}-phase\] |
| B. | \[{{\operatorname{G}}_{1}}-phase\] |
| C. | Prophase |
| D. | S - phase |
| Answer» E. | |
| 1785. |
When, under certain conditions, the p50 value of haemoglobin rises, the affinity of the pigment of combining with \[{{O}_{2}}\]Will: |
| A. | Remain same |
| B. | Rise |
| C. | Fall |
| D. | First rise and then fall |
| Answer» D. First rise and then fall | |
| 1786. |
Ciliated epithelium in trachea of mammals helps in: |
| A. | Sucking inspired air in. |
| B. | Perceiving sense of smell. |
| C. | Pushing expired air out. |
| D. | Pushing mucus out. |
| Answer» E. | |
| 1787. |
Which of the following represents a larger volume of air than is normally found in the resting tidal volume of a human lung? |
| A. | Residual volume |
| B. | Inspiratory reserve volume |
| C. | Expiratory reserve volume |
| D. | All of the above |
| Answer» E. | |
| 1788. |
In a germinating seed, when protein is aerobically oxidised, the R. Q. value will be: |
| A. | One |
| B. | Zero |
| C. | More than one |
| D. | Less than one |
| Answer» E. | |
| 1789. |
When \[C{{O}_{2}}\] concentration in blood increases, breathing becomes: |
| A. | Slow and deep |
| B. | Faster and deeper |
| C. | Shallower and slow |
| D. | There is no effect on breathing |
| Answer» C. Shallower and slow | |
| 1790. |
Refer the given figure and answer the question. Which of the following statement is correct regarding the above figure? |
| A. | When percentage saturation of haemoglobin is plotted against the partial pressure of oxygen, a sigmoid curve is obtained. |
| B. | Binding of oxygen with haemoglobin is primarily related to partial pressure of carbon monoxide. |
| C. | The given graph illustrates the amount of \[Hb{{O}_{2}}\] as similar to Hb at different\[P{{O}_{2}}\]. |
| D. | None of the above |
| Answer» B. Binding of oxygen with haemoglobin is primarily related to partial pressure of carbon monoxide. | |
| 1791. |
Which one of the following can respire in the absence of oxygen? |
| A. | Amoeba |
| B. | Tapeworm |
| C. | House fly |
| D. | Hydra |
| Answer» C. House fly | |
| 1792. |
The disease that occurs when the haemoglobin content of the blood goes down is: |
| A. | Pleurisy |
| B. | Emphysema |
| C. | Anaemia |
| D. | Pneumonia |
| Answer» D. Pneumonia | |
| 1793. |
Which one of the following is called inspiratory muscle in mammals? |
| A. | Radial muscle of diaphragm |
| B. | External intercostal muscle |
| C. | Internal intercostal muscle |
| D. | Pleural muscle |
| Answer» C. Internal intercostal muscle | |
| 1794. |
Book lungs are respiratory organs of: |
| A. | Molluscs |
| B. | Mammals |
| C. | Arachnids |
| D. | Earthworm |
| Answer» D. Earthworm | |
| 1795. |
In which of the following animals respiration occurs without a respiratory organ? |
| A. | Fish |
| B. | Cockroach |
| C. | Tadpole |
| D. | Earthworm |
| Answer» E. | |
| 1796. |
A zoologist compared the respiratory efficiency and swimming speed of different fish. He found that less efficient fish tended to have: |
| A. | Greater ventilation |
| B. | A thicker respiratory surface |
| C. | More haemoglobin |
| D. | A faster heart rate |
| Answer» C. More haemoglobin | |
| 1797. |
Which of the following is not involved in the neural control of ventilation? |
| A. | Neurons in the medulla |
| B. | The vagus nerve |
| C. | The contraction state of the diaphragm |
| D. | Chemosensors on the surface of the medulla |
| Answer» D. Chemosensors on the surface of the medulla | |
| 1798. |
About how many times per minute a man normally respires? |
| A. | 12 to 15 |
| B. | 10 |
| C. | 72 |
| D. | 100 |
| Answer» B. 10 | |
| 1799. |
When you exhale, the diaphragm: |
| A. | Relaxes and arches |
| B. | Relaxes and flattens |
| C. | Contracts and arches |
| D. | Contracts and flattens |
| Answer» B. Relaxes and flattens | |
| 1800. |
Respiratory system is derived from: |
| A. | Ectoderm |
| B. | Mesoderm |
| C. | Endoderm |
| D. | None of these |
| Answer» D. None of these | |