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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.
| 10801. |
Genetic diversity in agricultural crops in threatened by [AIIMS 2005] |
| A. | Introduction of high yielding varieties |
| B. | Intensive use of fertilizers |
| C. | Extensive intercropping |
| D. | Intensive use of biopesticides |
| Answer» B. Intensive use of fertilizers | |
| 10802. |
Which one of the following spice has primary home in India |
| A. | Black pepper |
| B. | Cardomom |
| C. | Ginger |
| D. | All the above |
| Answer» E. | |
| 10803. |
Sugarcane show high efficiency of \[C{{O}_{2}}\] fixation because of [CPMT 2004] |
| A. | Calvin cycle |
| B. | Hatch and Slack cycle |
| C. | TCA cycle |
| D. | Greater sunlight |
| Answer» C. TCA cycle | |
| 10804. |
Plant hormone which is translocated to other parts for growth of the plant is known as [AFMC 1980] |
| A. | Indole acetic acid |
| B. | Gibberellins |
| C. | Cytokinins |
| D. | None of the above |
| Answer» B. Gibberellins | |
| 10805. |
When a plant faces scarcity of water, which of the following hormone is synthesized in its mesophyll tissue |
| A. | Auxin |
| B. | Gibberellin |
| C. | Cytokinin |
| D. | Abscissic acid |
| Answer» E. | |
| 10806. |
Assertion : Sharbati Sonora was developed from Mexican wheat variety. Reason : It became possible by hybridization process. |
| A. | If both the assertion and the reason are true and the reason is a correct explanation of the assertion |
| B. | If both the assertion and reason are true but the reason is not a correct explanation of the assertion |
| C. | If the assertion is true but the reason is false |
| D. | If both the assertion and reason are false |
| E. | If the assertion is false but reason is true |
| Answer» D. If both the assertion and reason are false | |
| 10807. |
Read the assertion and reason carefully: Assertion : Many plants are propagated vegetatively even though they bear seeds. Reason : Potatos multiply by tubers, apple by cutting. [AIIMS 2001] |
| A. | If both the assertion and the reason are true and the reason is a correct explanation of the assertion |
| B. | If both the assertion and reason are true but the reason is not a correct explanation of the assertion |
| C. | If the assertion is true but the reason is false |
| D. | If both the assertion and reason are false |
| E. | If the assertion is false but reason is true |
| Answer» B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion | |
| 10808. |
Differentiation of shoot is controlled by [CBSE PMT 1999] |
| A. | High gibberellin : Cytokinin ratio |
| B. | High cytokinin : auxin ratio |
| C. | High auxin : cytokinin ratio |
| D. | High gibberellin : auxin ratio |
| Answer» D. High gibberellin : auxin ratio | |
| 10809. |
The fertile female honey bee is called |
| A. | Drone |
| B. | Worker |
| C. | Queen |
| D. | King |
| Answer» D. King | |
| 10810. |
In man the normal number of chromosomes is [CPMT 1972; MP PMT 1994] |
| A. | 42 |
| B. | 44 |
| C. | 46 |
| D. | 48 |
| Answer» D. 48 | |
| 10811. |
A repeated cycle of DNA replication without separation of daughter chromatids leads to the formation of |
| A. | Pachytene chromosome |
| B. | Leptotene chromosomes |
| C. | Polytene chromosome |
| D. | Zygotene chromosomes |
| Answer» D. Zygotene chromosomes | |
| 10812. |
Which one is the largest unicellular organism [Kerala PMT 2004] |
| A. | Planaria |
| B. | Volvax |
| C. | Blue green algae |
| D. | Yeast |
| E. | Acetabularia |
| Answer» F. | |
| 10813. |
\[C{{O}_{2}}\] content of atmosphere has increased in the last 150 years from [AIIMS 1997] |
| A. | 25 to 35 ppm |
| B. | 270 to 340 ppm |
| C. | 0.027 to 0.34 ppm |
| D. | 0.2 to 0.3 ppm |
| Answer» C. 0.027 to 0.34 ppm | |
| 10814. |
Jacobson's organ is related to [CPMT 1994] |
| A. | Taste |
| B. | Sight |
| C. | Touch |
| D. | Smell |
| Answer» E. | |
| 10815. |
Which of the following represents the correct sequence of relative sizes in descending order |
| A. | Cell, nucleus, chromosome, water molecule, oxygen atom |
| B. | Cell, nucleus, water molecule, oxygen atom, chromosome |
| C. | Chromosome, cell, nucleus, water molecule, oxygen atom |
| D. | Cell, nucleus, water molecule, chromosome, oxygen atom |
| Answer» B. Cell, nucleus, water molecule, oxygen atom, chromosome | |
| 10816. |
In most plant cells most enzymes have their optimum activity at |
| A. | \[{{20}^{o}}C\] |
| B. | \[{{25}^{o}}C\] |
| C. | \[{{30}^{o}}C\] |
| D. | \[{{35}^{o}}C\] |
| Answer» C. \[{{30}^{o}}C\] | |
| 10817. |
Pepsin is inactivated at pH [BHU 2003] |
| A. | Below 3 |
| B. | Below 2 |
| C. | Above 5 |
| D. | Above 3 |
| Answer» D. Above 3 | |
| 10818. |
The pesticides most toxic to vertebrates are |
| A. | Organochlorines |
| B. | Organophosphates |
| C. | Carbamates |
| D. | None of these |
| Answer» C. Carbamates | |
| 10819. |
Kranz type of anatomy is found in [CBSE PMT 1990; CPMT 1986; AMU 1986; RPMT 1995, 97] |
| A. | \[{{C}_{2}}\]plants |
| B. | \[{{C}_{3}}\]plants |
| C. | \[{{C}_{4}}\]plants |
| D. | CAM plants |
| Answer» D. CAM plants | |
| 10820. |
Assertion : Cephalization is advantageous to an animal. [AIIMS 1994] Reason : It improves the appearance of the animal. |
| A. | If both the assertion and the reason are true and the reason is a correct explanation of the assertion |
| B. | If both the assertion and reason are true but the reason is not a correct explanation of the assertion |
| C. | If the assertion is true but the reason is false |
| D. | If both the assertion and reason are false |
| E. | If the assertion is false but reason is true |
| Answer» D. If both the assertion and reason are false | |
| 10821. |
The energy obtained from biological resources is called [RPMT 1990] |
| A. | Electrical energy |
| B. | Mechanical energy |
| C. | Bioenergy |
| D. | Life energy |
| Answer» D. Life energy | |
| 10822. |
The branch of science dealing with the study of birds is [AFMC 1985; CPMT 1986] |
| A. | Herpetology |
| B. | Ornithology |
| C. | Onoclogy |
| D. | Anthropology |
| Answer» C. Onoclogy | |
| 10823. |
White adipose tissue contains [MP PMT 2003] |
| A. | Multilocular fat cells |
| B. | Bilocular fat cells |
| C. | Unilocular fat cells |
| D. | Alocular fat cells |
| Answer» D. Alocular fat cells | |
| 10824. |
Which of the followig is a marine snake [MP PMT 1988] |
| A. | Enhydrina |
| B. | Typhlops |
| C. | Bungarus |
| D. | Naja |
| Answer» B. Typhlops | |
| 10825. |
Tonofibrils are related to |
| A. | Nuclear membrane |
| B. | Chloroplast |
| C. | Mitochondria |
| D. | Plasmodesmata |
| Answer» E. | |
| 10826. |
Coenobium means |
| A. | A hollow spherical colony |
| B. | A group of filaments |
| C. | Palmelloid form |
| D. | None of the above |
| Answer» B. A group of filaments | |
| 10827. |
In mammals, histamine is secreted by [CBSE PMT 1998; AFMC 2002] |
| A. | Fibroblasts |
| B. | Histiocytes |
| C. | Lymphocytes |
| D. | Mast cells |
| Answer» E. | |
| 10828. |
DNA and histone proteins are synthesized during the following phase of cell cycle [DPMT 2004; CBSE PMT 2005] |
| A. | S phase |
| B. | \[{{G}_{2}}\]phase |
| C. | \[{{G}_{1}}\]phase |
| D. | None of these |
| Answer» B. \[{{G}_{2}}\]phase | |
| 10829. |
Yeast in an important source of [CPMT 1993] |
| A. | Vitamin C |
| B. | Vitamin B |
| C. | Vitamin A |
| D. | Vitamin D |
| Answer» C. Vitamin A | |
| 10830. |
Assertion : In frogs, the entire skin serves as tangoreceptors. Reason : Tactile organs and patches are present throughout the skin of frog. |
| A. | If both the assertion and the reason are true and the reason is a correct explanation of the assertion |
| B. | If both the assertion and reason are true but the reason is not a correct explanation of the assertion |
| C. | If the assertion is true but the reason is false |
| D. | If both the assertion and reason are false |
| E. | If the assertion is false but reason is true |
| Answer» B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion | |
| 10831. |
Assertion : WBCs accumulate at site of wounds by diapedesis. Reason : It is squeezing of leucocytes from endothelium. [AIIMS 2002] |
| A. | If both the assertion and the reason are true and the reason is a correct explanation of the assertion |
| B. | If both the assertion and reason are true but the reason is not a correct explanation of the assertion |
| C. | If the assertion is true but the reason is false |
| D. | If both the assertion and reason are false |
| E. | If the assertion is false but reason is true |
| Answer» C. If the assertion is true but the reason is false | |
| 10832. |
Assertion : Ovotestis is the characteristics of Myxine. Reason : In Myxine, testis remains hidden within the ovary. |
| A. | If both the assertion and the reason are true and the reason is a correct explanation of the assertion |
| B. | If both the assertion and reason are true but the reason is not a correct explanation of the assertion |
| C. | If the assertion is true but the reason is false |
| D. | If both the assertion and reason are false |
| E. | If the assertion is false but reason is true |
| Answer» D. If both the assertion and reason are false | |
| 10833. |
In biotechnological studies, the alga that is exploited as a rich source of protein is [BHU 1990; AIIMS 2003] |
| A. | Spirogyra |
| B. | Spirulina |
| C. | Chlamydomonas |
| D. | Scytonema |
| Answer» C. Chlamydomonas | |
| 10834. |
Phycology is the study of [AFMC 1994; Orissa JEE 2005; AMU 2005] |
| A. | Algae |
| B. | Fungi |
| C. | Bacteria |
| D. | All the above |
| Answer» B. Fungi | |
| 10835. |
The theory of jumping genes was propounded by or Noble prize for the concept of jumping gene was give [MHCET 2001; BVP 2001, 03, 04; MP PMT 2002; CPMT 2003] |
| A. | Mendel |
| B. | Morgan |
| C. | Barbara Mc Clintock |
| D. | Sanger |
| Answer» D. Sanger | |
| 10836. |
Carpo-metacarpus and tarso-metatarsus are present in |
| A. | Reptilia |
| B. | Mammalia |
| C. | Birds |
| D. | Both (a) and (b) |
| Answer» D. Both (a) and (b) | |
| 10837. |
NAA is |
| A. | Nicotinic acid |
| B. | Nitroacetic acid |
| C. | Naphthalene acetic acid |
| D. | Naphthalene acetic anhydride |
| Answer» D. Naphthalene acetic anhydride | |
| 10838. |
The process of mitosis is divided into 4 phases. Identify the correct order in which these phases appear in mitosis [MP PMT 1993] |
| A. | Anaphase, metaphase, telophase and prophase |
| B. | Telophase, anaphase, metaphase and prophase |
| C. | Metaphase, prophase, anaphase and telophase |
| D. | Prophase, metaphase, anaphase and telophase |
| Answer» E. | |
| 10839. |
Pruning makes the hedge plant dense because [AIIMS 1984] |
| A. | Injury induces dense growth |
| B. | Apical dominance is removed |
| C. | Root sprouts additional branches |
| D. | Pruning removes shade and allows germination of new seedlings to impart a dense growth |
| Answer» C. Root sprouts additional branches | |
| 10840. |
Assertion : Yeast show fermentation. Reason : They show anaerobic respiration only. |
| A. | If both the assertion and the reason are true and the reason is a correct explanation of the assertion |
| B. | If both the assertion and reason are true but the reason is not a correct explanation of the assertion |
| C. | If the assertion is true but the reason is false |
| D. | If both the assertion and reason are false |
| E. | If the assertion is false but reason is true |
| Answer» D. If both the assertion and reason are false | |
| 10841. |
Similarity between fish and tadpole is [BVP 2001] |
| A. | Legs |
| B. | Fins |
| C. | Lateral line |
| D. | Scales |
| Answer» D. Scales | |
| 10842. |
How many ATP is required during anaphase to move chromosomes from equator to the poles [BHU 2000] |
| A. | 38 ATP |
| B. | 5 ATP |
| C. | 30 ATP |
| D. | 76 ATP |
| Answer» D. 76 ATP | |
| 10843. |
12 pairs of cranial nerves are present in [AIIMS 1993] |
| A. | Reptilia |
| B. | Birds only |
| C. | Mammals only |
| D. | All the above |
| Answer» E. | |
| 10844. |
Gasohol mixture is useful as |
| A. | Fermenter |
| B. | Manure |
| C. | Automobile fuel |
| D. | All of these |
| Answer» D. All of these | |
| 10845. |
The enzyme which converts glucose into ethyl alcohol is [MP PMT 1998, 2003] |
| A. | Diastase |
| B. | Maltase |
| C. | Zymase |
| D. | Invertase |
| Answer» D. Invertase | |
| 10846. |
Assertion : Glycolysis occurs in cytoplasm. Reason : Enzymes for glycolysis are found in cytoplasm. It is common in aerobic/anaerobic respiration [AIIMS 2002] |
| A. | If both the assertion and the reason are true and the reason is a correct explanation of the assertion |
| B. | If both the assertion and reason are true but the reason is not a correct explanation of the assertion |
| C. | If the assertion is true but the reason is false |
| D. | If both the assertion and reason are false |
| E. | If the assertion is false but reason is true |
| Answer» B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion | |
| 10847. |
Mark the odd member from the following |
| A. | Turtle |
| B. | Lizard |
| C. | Dolphin |
| D. | Crocodile |
| Answer» D. Crocodile | |
| 10848. |
Deserts occur in areas of |
| A. | Adverse human disturbance |
| B. | Underground saline water |
| C. | Little underground water |
| D. | Rain shadow |
| Answer» E. | |
| 10849. |
Assertion : The movement of photosynthates is unidirectional. Reason : Movement of photosynthates occurs with the water. |
| A. | If both the assertion and the reason are true and the reason is a correct explanation of the assertion |
| B. | If both the assertion and reason are true but the reason is not a correct explanation of the assertion |
| C. | If the assertion is true but the reason is false |
| D. | If both the assertion and reason are false |
| E. | If the assertion is false but reason is true |
| Answer» B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion | |
| 10850. |
One of the plants using 'Foliar adventitious buds' as method for vegetative propagation is [AIEEE 2004] |
| A. | Banana |
| B. | Ginger |
| C. | Bryophyllum |
| D. | Calocasia |
| Answer» D. Calocasia | |