MCQOPTIONS
Saved Bookmarks
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.
| 10901. |
Morgan was awarded Nobel Prize for |
| A. | Gene theory |
| B. | Nuclear theory |
| C. | DNA theory |
| D. | Cytoplasmic inheritance |
| Answer» B. Nuclear theory | |
| 10902. |
Heteromorphic alternation of generation is commonly found in |
| A. | Algae |
| B. | Fungi |
| C. | Bryophyta |
| D. | All the above |
| Answer» D. All the above | |
| 10903. |
If living cells similar to those found on earth, were found on another planet where there was no oxygen. Which cell organelle would most probably be absent [CPMT 1989] |
| A. | Cell membrane |
| B. | Ribosomes |
| C. | Mitochondria |
| D. | Chromosomes |
| Answer» D. Chromosomes | |
| 10904. |
Oryza sativa (rice) belongs to [MP PMT 1993] |
| A. | Solanaceae |
| B. | Malvaceae |
| C. | Liliaceae |
| D. | Poaceae |
| Answer» E. | |
| 10905. |
The milch breed of cattle are [AMU 1992] |
| A. | Hillikar, Nageri and Malvi |
| B. | Gir, Sahiwal and Deoni |
| C. | Kankrej, Haryana and Ongole |
| D. | Tharpaker, Kangayan |
| Answer» C. Kankrej, Haryana and Ongole | |
| 10906. |
Sea weeds are important source of [AFMC 2004] |
| A. | Chlorine |
| B. | Fluorine |
| C. | Iodine |
| D. | Bromine |
| Answer» B. Fluorine | |
| 10907. |
One of the following is known as ?oil sardine? [EAMCET 1999] |
| A. | Atropus surtensis |
| B. | Harpodon recherius |
| C. | Sardinella longiceps |
| D. | Rastrelliger kanegunta |
| Answer» D. Rastrelliger kanegunta | |
| 10908. |
Assertion : Saccharomyces cerevisiae is used to make the bread soft and spongy. Reason : \[C{{O}_{2}}\] and alcohol evaporate during the 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» B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion | |
| 10909. |
If the concentration of IAA is increased in the roots of a plant, the absorption of water would |
| A. | Increase |
| B. | Decrease |
| C. | First decrease then increase |
| D. | Remain unaffected |
| Answer» B. Decrease | |
| 10910. |
Eukaryotic cells possess a cytoskeleton of |
| A. | Microtubules, microfilaments and cytoplasm |
| B. | Microtubules, microfilaments and protoplasm |
| C. | Microtubules, microfilaments and proteins |
| D. | None of the above |
| Answer» B. Microtubules, microfilaments and protoplasm | |
| 10911. |
Levitt performed experiments. He observed that auxin treated cells were able to absorb water even when kept in hypertonic solution. Which explains this observation best [Manipal 2005] |
| A. | Auxin treated cells lose selective permeability |
| B. | ATP production increases and therefore much energy is available for active absorption |
| C. | Auxin lowers the water potential of cells |
| D. | Auxin increases the solute potential of cells |
| Answer» D. Auxin increases the solute potential of cells | |
| 10912. |
Assertion : Allosteric enzymes show feed back inhibition. Reason : The inhibitor is competitive. |
| 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 | |
| 10913. |
Which is correct [CBSE PMT 1994] |
| A. | Legumes fix nitrogen through bacteria in their leaves ? |
| B. | Legumes fix nitrogen through bacteria in their roots |
| C. | Legumes fix nitrogen independent of bacteria |
| D. | Legumes do not fix nitrogen |
| Answer» C. Legumes fix nitrogen independent of bacteria | |
| 10914. |
Antibiotics occur from [MP PMT 2004] |
| A. | Medicines |
| B. | Toxins |
| C. | Plants |
| D. | Syrups |
| Answer» B. Toxins | |
| 10915. |
Assertion : In electron transport chain, there is a gain of energy at each step. Reason : At each step of ETC, there are electron carriers. |
| 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» F. | |
| 10916. |
Beer is obtained by the fermentation of seeds of |
| A. | Hordeum vulgare |
| B. | Rice |
| C. | Maize |
| D. | All the above |
| Answer» E. | |
| 10917. |
Which one of the following groups consists of non-renewable organic resources |
| A. | Air, sand and clay |
| B. | Coal, oil and natural gas |
| C. | Air, minerals and water |
| D. | Water, wood and natural pastures |
| Answer» C. Air, minerals and water | |
| 10918. |
If a bird is transfered from 30°C to 10°C. The body temperature will change to [CPMT 1982] |
| A. | 10°C |
| B. | 30°C |
| C. | 15°C |
| D. | Remain unchanged |
| Answer» E. | |
| 10919. |
An inherited factor that determines a biological characteristic of an organism is called [DPMT 1991] |
| A. | Gene |
| B. | Chromosome |
| C. | Allele |
| D. | Chromatid |
| Answer» B. Chromosome | |
| 10920. |
Read the assertion and reason carefully to mark the correct option out of the options given below: Assertion : Growth involves the synthesis of protoplasmic as well as a protoplasmic materials. Reason : During growth, catabolic activities are faster than anabolic activities. |
| 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 | |
| 10921. |
Endangered, vulnerable and rare animals are known as |
| A. | Living fossils |
| B. | Protected species |
| C. | Threatened species |
| D. | None |
| Answer» D. None | |
| 10922. |
In old age problems like indigestion constipation and gases are caused because of |
| A. | Number of taste buds are decreased |
| B. | Amount of digestive juices decreases |
| C. | Muscular strength reduces |
| D. | All the above |
| Answer» C. Muscular strength reduces | |
| 10923. |
Which of the following has high sugar contents |
| A. | Flint corn |
| B. | Dent corn |
| C. | Sweet corn |
| D. | Waxy corn |
| Answer» D. Waxy corn | |
| 10924. |
Deforestation leads to [AMU 1998; MHCET 2003] |
| A. | Soil erosion |
| B. | Global warming |
| C. | Soil protection |
| D. | Both a and b |
| Answer» E. | |
| 10925. |
Healing process is helped by |
| A. | Heparin |
| B. | Histamine |
| C. | Serotonin |
| D. | None of the above |
| Answer» E. | |
| 10926. |
Scorpion, spiders, lizards and rattle snake are inhabitants of |
| A. | Tropical rain forest |
| B. | Temperate forest |
| C. | Grassland biome |
| D. | Desert biome |
| Answer» E. | |
| 10927. |
VAM is important for [Kerala PMT 2000] |
| A. | Breaking of dormancy |
| B. | Phosphate nutrition |
| C. | Water uptake |
| D. | Retarding flowering |
| E. | Decrease in yield |
| Answer» C. Water uptake | |
| 10928. |
Assertion : The shape of chromosomes is based on the position of centromere. Reason : During anaphase, the chromosome bends in the region of centromere. |
| 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 | |
| 10929. |
Nitrates are transformed into nitrogen by [CPMT 2003] |
| A. | Ammonifying bacteria |
| B. | Nitrifying bacteria |
| C. | Denitrifying bacteria |
| D. | Both a and b |
| Answer» D. Both a and b | |
| 10930. |
Assertion : Histamine is related with allergic and inflammatory reactions. Reason : Histamine is a vasodilator. |
| 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 | |
| 10931. |
Which one of the following is the sweetest sugar [AFMC 2002] |
| A. | Fructose |
| B. | Glucose |
| C. | Galactose |
| D. | Sucrose |
| Answer» B. Glucose | |
| 10932. |
Llamas and Alpacas are |
| A. | Breeds of buffaloes |
| B. | Breeds of Horses |
| C. | Breeds of Camels |
| D. | Breeds of Sheeps |
| Answer» D. Breeds of Sheeps | |
| 10933. |
Which of the following is the major source of phosphorus |
| A. | Plants |
| B. | Animals |
| C. | Crystalline rocks |
| D. | Deserts |
| Answer» D. Deserts | |
| 10934. |
Dichotomous branching is found in [CBSE PMT 1999] |
| A. | Fern |
| B. | Funaria |
| C. | Liverworts |
| D. | Marchantia |
| Answer» D. Marchantia | |
| 10935. |
Assertion : Exanthema disease occurs due to deficiency of manganese. Reason : Reclamation is a disease of cereals. |
| 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» F. | |
| 10936. |
Which of the following amino acids is not optically active[ BHU 2005] |
| A. | Glycine |
| B. | Valine |
| C. | Leucine |
| D. | Isoleucine |
| Answer» B. Valine | |
| 10937. |
Assertion : Hybrids are generally back crossed. Reason : Back cross is done to increase the traits of the parent. |
| 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 | |
| 10938. |
Read the assertion and reason carefully: Assertion : Endosperm is a nutritive tissue and it is triploid. Reason : Endosperm is formed by fusion of secondary nucleus to second male gamete. It is used by developing embryo. [AIIMS 1998] |
| 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 | |
| 10939. |
Assertion : Parasitism prevails in several groups of crustacea. Reason : Parasites however, are not known among the Branchiopoda and Ostracoda. |
| 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 | |
| 10940. |
Energy plantations vary from energy cropping in being |
| A. | Substitute for petroleum |
| B. | Source of fuel wood |
| C. | Renewable |
| D. | None of these |
| Answer» C. Renewable | |
| 10941. |
Conversion of pyruvic acid into lactic acid depends upon |
| A. | Absence of oxygen |
| B. | Presence of NAD |
| C. | Presence of enzymes |
| D. | None of the above |
| Answer» B. Presence of NAD | |
| 10942. |
Typhlop is a [NCERT 1983; CBSE PMT 1988; BHU 2001] |
| A. | True snake |
| B. | False snake |
| C. | True worm |
| D. | Shark |
| Answer» B. False snake | |
| 10943. |
Which of the following photosynthetic bacteria have both PS-I and PS-II [CPMT 1990] |
| A. | Green sulphur bacteria |
| B. | Purple sulphur bacteria |
| C. | Cyanobacteria |
| D. | Purple non-sulphur bacteria |
| Answer» D. Purple non-sulphur bacteria | |
| 10944. |
Raphides are needle-like crystals made up of [Bihar MDAT 1995; Orissa JEE 2004] |
| A. | Calcium carbonate |
| B. | Calcium sulphate |
| C. | Calcium oxalate |
| D. | Calcium pectate |
| Answer» D. Calcium pectate | |
| 10945. |
Drinking of mineral water with very low level of pesticides (about 0.02 ppm) for long periods may [AIIMS 2003] |
| A. | Produce immunity against mosquito |
| B. | Cause leukemia (blood cancer) in most people |
| C. | Cause cancer of the intestine |
| D. | Lead to accumulation of pesticide residues in body fat |
| Answer» E. | |
| 10946. |
Which ions are toxic in enzymatic activity |
| A. | \[M{{n}^{++}}\] |
| B. | \[{{K}^{+}}\] |
| C. | \[N{{a}^{++}}\] |
| D. | \[H{{a}^{++}}\] |
| Answer» E. | |
| 10947. |
The fuel wood crisis can be overcome by [KCET 1997] |
| A. | Efficient forest extractions |
| B. | Afforestation |
| C. | More efficient heat transfer |
| D. | A combination of these |
| Answer» B. Afforestation | |
| 10948. |
Milk glands are found in [CPMT 1982] |
| A. | All vertebrates |
| B. | All mammals |
| C. | All placental mammals |
| D. | All prototherians |
| Answer» C. All placental mammals | |
| 10949. |
Which of the following pesticides is employed widely in antimalarial programmes |
| A. | Aldrin |
| B. | Malathion |
| C. | BHC |
| D. | None |
| Answer» C. BHC | |
| 10950. |
Read the assertion and reason carefully: Assertion : Onion leaves are centric and green. Reason : Aerial leaves of onion store food. |
| 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 | |