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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.
| 1101. |
The enzyme responsible for the reduction of molecular nitrogen to the level of ammonia in leguminous root nodule is: |
| A. | Nitrogenase |
| B. | Nitrite reductase |
| C. | Nitrate reductase |
| D. | Hydrogenase |
| Answer» B. Nitrite reductase | |
| 1102. |
Consider the functions given below and identify the concerned element. (i) Activator of catalase. (ii) Important constituent of cytochrome. (iii) Important constituent of proteins involved in ETS. (iv) Essential for chlorophyll synthesis. |
| A. | Mo |
| B. | Fe |
| C. | Cu |
| D. | Ca |
| Answer» C. Cu | |
| 1103. |
Match Column-I with Column - II and select the correct answer using the codes given below. Column-I Column-II A. Potassium I. Constituent of ferredoxin B. Sulphur II. Involved in stomatal movement C. Molybdenum III. Needed in the synthesis of auxin D. Zinc IV. Component of nitrogenase |
| A. | A-II; B-I; C-IV; D-III |
| B. | A-I; B-II; C-III; D-IV |
| C. | A-IV; B-III; C-II; D-I |
| D. | A-I; B-III; C-IV; D-II |
| Answer» B. A-I; B-II; C-III; D-IV | |
| 1104. |
Mycorrhiza is a symbiotic relationship between roots of higher plants and: |
| A. | Virus |
| B. | Fungi |
| C. | Bacteria |
| D. | Blue green algae |
| Answer» C. Bacteria | |
| 1105. |
Which of the following gene clusters in bacteria is responsible for nitrogen fixation? |
| A. | nod, nif, fix |
| B. | nod, nif, nfx |
| C. | nod, nix, nfx |
| D. | ndx, nif, fix |
| Answer» B. nod, nif, nfx | |
| 1106. |
If the size of fruits diminishes in plants, which mineral ion should be added to soil? |
| A. | Copper |
| B. | Calcium |
| C. | Boron |
| D. | Chlorine |
| Answer» D. Chlorine | |
| 1107. |
Match the following and choose the correct combination from the options given. Column-I Column-II A. Sulphur I. Chlorophyll B. Zinc II. Nitrogenase C. Magnesium III. Methionine D. Molybdenum IV. Auxin |
| A. | A-I; B-II; C-III; D-IV |
| B. | A-III; B-IV; C-I; D-II |
| C. | A-III; B-I; C-II; D-IV |
| D. | A-II; B-IV; C-I; D-III |
| Answer» C. A-III; B-I; C-II; D-IV | |
| 1108. |
Nif genes occur in: |
| A. | Rhizobium |
| B. | Aspergillus |
| C. | Penicillium |
| D. | Streptococcus |
| Answer» B. Aspergillus | |
| 1109. |
Which of the following statements are incorrect in accordance with hydroponics? (i) It determines the mineral nutrients essential for plants. (ii) The hydroponics involves the culture of plants in a soil with defined mineral solution. (iii) Hydroponics requires purified water with non-defined mineral nutrient salts. (iv) In the hydroponics technique, plants are grown in sandy soil with nutrient solution. (v) By this method, essential elements required for the growth of plants can be identified and their deficiency symptoms can also be discovered. |
| A. | Only (iv) |
| B. | Only (v) |
| C. | Only (iii) |
| D. | None of the above |
| Answer» D. None of the above | |
| 1110. |
Which of the following is a free living aerobic non-photosynthetic nitrogen-fixer? |
| A. | Rhizobium |
| B. | Azotobacter |
| C. | Azospirillum |
| D. | Nostoc |
| Answer» D. Nostoc | |
| 1111. |
Refer the figure given below and select the option which gives correct words for A, B, C And D. |
| A. | A B C D (a) K Ammonification Animal biomass Plant biomass |
| B. | (b) \[N{{H}_{3}}\] Ammonification Plant biomass Animal biomass |
| C. | (c) \[C{{O}_{2}}\] Denitrification Animal biomass Plant biomass |
| D. | (d) CHO Nitrification Plant biomass Animal biomass |
| Answer» C. (c) \[C{{O}_{2}}\] Denitrification Animal biomass Plant biomass | |
| 1112. |
The diagram shows the development of root nodule in soyabean. |
| A. | 1-Rhizobium bacteria; 2-Cortex cell; 3-Outer cortex; 4-Infection thread |
| B. | 1-Rhizobium bacteria; 2-Cortex cell; 3-Inner cortex and pericycle cells; 4-Infection thread |
| C. | 1-Rhizobium bacteria; 2-Endodermal cell; 3-Inner endodermis; 4-Infection thread |
| D. | 1-Nitrosomonas bacteria; 2-Cortex cell; 3-Inner cortex and pericyle cells; 4-Infection thread |
| Answer» C. 1-Rhizobium bacteria; 2-Endodermal cell; 3-Inner endodermis; 4-Infection thread | |
| 1113. |
Active uptake of minerals depends upon: |
| A. | Active water absorption |
| B. | Transpiration |
| C. | Photorespiration |
| D. | Dephosphorylation |
| Answer» E. | |
| 1114. |
Which element is related with Khaira disease of paddy & auxin synthesis? |
| A. | Fe |
| B. | Zn |
| C. | B |
| D. | Cu |
| Answer» C. B | |
| 1115. |
Chlorosis is produced in leaves due to deficiency of Fe, Mg, Mn, N or S. Of these essential elements, those that are exclusive constituents of the chlorophyll molecule are: |
| A. | Fe and S |
| B. | N and S |
| C. | Mg and S |
| D. | Mg and N |
| Answer» E. | |
| 1116. |
The plant ash is an indication of: |
| A. | Mineral salts absorbed by the plant |
| B. | Organic matter of the plant |
| C. | Both the mineral salts and organic matter |
| D. | None of the above |
| Answer» B. Organic matter of the plant | |
| 1117. |
Hydroponics is a technique in which plants are grown in: |
| A. | Green house |
| B. | Water saturated sand |
| C. | Balanced nutrient solution |
| D. | Purified distilled water |
| Answer» D. Purified distilled water | |
| 1118. |
Which of the following characteristics defines an element as essential for a particular species? |
| A. | It has to be added as fertiliser to achieve maximum seed production. |
| B. | If it is missing, a plant cannot grow or reproduce normally. |
| C. | If it is present in high concentration, plant growth increases. |
| D. | If it is absent, other nutrients may be substituted for it. |
| Answer» C. If it is present in high concentration, plant growth increases. | |
| 1119. |
Essential macro elements are: |
| A. | Absorbed from soil. |
| B. | Manufactured during photosynthesis. |
| C. | Produced by enzymes. |
| D. | Produced by growth hormones. |
| Answer» B. Manufactured during photosynthesis. | |
| 1120. |
Function of leghaemoglobin (a red pigment) in root nodules of leguminous plants is to regulate: |
| A. | \[{{O}_{2}}\]supply in cells |
| B. | \[C{{O}_{2}}\] supply in cells |
| C. | Production of phenolic compounds |
| D. | Mo supply in cells |
| Answer» B. \[C{{O}_{2}}\] supply in cells | |
| 1121. |
Phosphorous and nitrogen ions generally get depleted in soil because they usually occur as: |
| A. | Neutral ions |
| B. | Negatively charged ions |
| C. | Positively charged ions |
| D. | Both positively and negatively charged but in disproportionate mixture. |
| Answer» E. | |
| 1122. |
Which of the following will not make minerals more available to plants? |
| A. | Increasing the rainfall in a wet forested area. |
| B. | Raising the pH of a very acidic soil. |
| C. | Tillering a packed-down or water-logged soil. |
| D. | Introducing fungi that can form mycorrhiza into a soil that lacks them. |
| Answer» B. Raising the pH of a very acidic soil. | |
| 1123. |
Gray spots of Oat are caused by deficiency of: |
| A. | Cu |
| B. | Zn |
| C. | Mn |
| D. | Fe |
| Answer» D. Fe | |
| 1124. |
Where does most nutrient uptake occur in roots? |
| A. | At the root tip, where root tissue first encounters soil away from the zone of nutrient depletion. |
| B. | At the casparian strip, where ions must enter the symplast prior to entering xylem cells. |
| C. | In the symplastic and apoplastic pathways. |
| D. | In root hairs and in the zone of maturation. |
| Answer» E. | |
| 1125. |
Insectivorous plants live in a soil that is usually deficient in: |
| A. | Nitrate |
| B. | Chloride |
| C. | Potassium |
| D. | Magnesium |
| Answer» B. Chloride | |
| 1126. |
Which of the following does NPK denote? |
| A. | Nitrogen, Potassium, Kinetin |
| B. | Nitrogen, Protein, Kinetin |
| C. | Nitrogen, Protein, Potassium |
| D. | Nitrogen, Phosphorus, Potassium |
| Answer» E. | |
| 1127. |
Which one of the following is an amide involved in nitrogen assimilation by plants? |
| A. | Glutamate |
| B. | Alanine |
| C. | Asparagine |
| D. | Serine |
| Answer» D. Serine | |
| 1128. |
Which element is not considered as macronutrient? |
| A. | Mg |
| B. | Ca |
| C. | Mn |
| D. | P |
| Answer» D. P | |
| 1129. |
Which one of these do, plants require for the formation of ATP? |
| A. | N and Ca |
| B. | N and P |
| C. | N and Cu |
| D. | K |
| Answer» C. N and Cu | |
| 1130. |
Which of the following pigment is essential for nitrogen fixation by leguminous plants? |
| A. | Anthocyanin |
| B. | Phycocyanin |
| C. | Phycoerythrin |
| D. | Leghaemoglobin |
| Answer» E. | |
| 1131. |
Which of the following element is very essential for uptake and utilisation of \[C{{a}^{2+}}\] and membrane function? |
| A. | Phosphorus |
| B. | Molybdenum |
| C. | Manganese |
| D. | Boron |
| Answer» E. | |
| 1132. |
Which of the following is a flowering plant with nodules containing filamentous nitrogen- fixing microorganism? |
| A. | Cicer arietinum |
| B. | Casuarina equisetifolia |
| C. | Crotalaria juncea |
| D. | Cycas revolute |
| Answer» C. Crotalaria juncea | |
| 1133. |
Appearance of brown spots surrounded by chlorotic veins is a prominent toxicity symptom of: |
| A. | Mn |
| B. | Mo |
| C. | Mg |
| D. | Zn |
| Answer» B. Mo | |
| 1134. |
Which one of the following is not an essential element for plants? |
| A. | Potassium |
| B. | Iron |
| C. | Iodine |
| D. | Zinc |
| Answer» D. Zinc | |
| 1135. |
Ratio of C:O in plant materials is: |
| A. | 45:45 |
| B. | 10:20 |
| C. | 25:50 |
| D. | 50:25 |
| Answer» B. 10:20 | |
| 1136. |
Molybdenum causes: |
| A. | Mottling |
| B. | Reclamation |
| C. | Wilting |
| D. | Chlorosis |
| Answer» E. | |
| 1137. |
Which of the following is essential mineral element and is not a constituent of any enzyme but stimulate the activity of many enzymes? |
| A. | Zn |
| B. | Mg |
| C. | Mn |
| D. | K |
| Answer» E. | |
| 1138. |
An essential element which: |
| A. | Is found in plant ash. |
| B. | Is available in the soil. |
| C. | Improves health of the plant. |
| D. | Is irreplaceable and indispensable for growth of plants. |
| Answer» E. | |
| 1139. |
"Mottled chlorosis" on the leaves occurs due to the deficiency of: |
| A. | Nitrogen |
| B. | Potassium |
| C. | Sulphur |
| D. | Phosphorus |
| Answer» C. Sulphur | |
| 1140. |
In the choices below, which is not a correct pairing of a macronutrient and the major functions it performs in the life of a plant? |
| A. | Potassium in enzyme activation, water balance, ion balance. |
| B. | Calcium in activity of embranes and cytoskeleton, secondary messenger. |
| C. | Sulphur in proteins and coenzymes. |
| D. | Iron in active sites of many redox enzymes and electron carriers. |
| Answer» E. | |
| 1141. |
Sulphur is component of: |
| A. | Protein |
| B. | DNA |
| C. | RNA |
| D. | Both [b] and [c] |
| Answer» B. DNA | |
| 1142. |
Pasteurisation is heating at: |
| A. | \[120{}^\circ C\]for 60 minutes |
| B. | \[60{}^\circ -63{}^\circ C\]for 30 minutes |
| C. | \[70{}^\circ C\]for 60 minutes |
| D. | \[80{}^\circ C\]for 30 minutes |
| Answer» C. \[70{}^\circ C\]for 60 minutes | |
| 1143. |
The bioacrive molecule Cyclosporine A is used in: |
| A. | Whooping cough |
| B. | Diphtheria |
| C. | Leprosy |
| D. | Organ-transplant patients |
| Answer» E. | |
| 1144. |
Meliantiol and salanin bioinsecticides have been extracted from: |
| A. | Chrysanthemum cinerariifolium |
| B. | Derris elliptica |
| C. | Azadirichta indica |
| D. | Eichhornia |
| Answer» D. Eichhornia | |
| 1145. |
Azolla enriches rice fields with nitrogen due to its association with: |
| A. | Anabaena |
| B. | Nostoc |
| C. | Rhizobium |
| D. | Frankia |
| Answer» B. Nostoc | |
| 1146. |
Bacillus thuringiensis (Bt) strains have been used as: |
| A. | Biofertilisers |
| B. | Biometallurgical techniques |
| C. | Biomineralisation processes |
| D. | Bioinsecticidal plants |
| Answer» E. | |
| 1147. |
Which of the following is common to Azospirillum, Azotobacter, Anabaena, Nostoc and Oscillatoria? |
| A. | Prokaryotes |
| B. | \[{{N}_{2}}\]-fixers |
| C. | Both [a] and [b] |
| D. | Eukaryotes |
| Answer» D. Eukaryotes | |
| 1148. |
Which of the following statements regarding Baculoviruses as bio-control agents is/are correct? (i) Baculoviruses are pathogens that attack insects and other arthropods. (ii) Most of these biocontrol agents belong to the genus Nucleopolyhedrovirus. (iii) They do not harm plants mammals, birds, fish and other non-target insects. (iv) Baculoviruses are helpful in Integrated Pest Management (IPM) programme, in which beneficial insects are conserved. Choose the correct option. |
| A. | (i), (ii) and (iii) |
| B. | (i), (ii) and (iv) |
| C. | (ii), (iii) and (iv) |
| D. | All of these |
| Answer» E. | |
| 1149. |
Sewage or municipal sewer pipes should not be directly left into rivers, streams and other water bodies because: (i) It contains human excreta and other organic waste. (ii) It contains a number of pathogenic microbes. Which of the statement given above is/are correct? |
| A. | Only (i) |
| B. | Only (ii) |
| C. | Both [a] and [b] |
| D. | None of the above |
| Answer» D. None of the above | |
| 1150. |
Which of the following statements is incorrect for stirred tank fermentaion? |
| A. | Buffer needed to control pH. |
| B. | Batch and feed possible. |
| C. | Control dissolved oxygen. |
| D. | Easy in process sampling. |
| Answer» D. Easy in process sampling. | |