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InterviewSolution
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. |
Transported and storage form of nitrogen in plants areA. AmidesB. PolypeptidesC. Amino acidsD. `alpha ` - ketoglutaric acids |
| Answer» Correct Answer - A | |
| 202. |
Ureides are preferred forms for storage and transport of nitrogen inA. Triticum aestivumB. Solanum nigrumC. Glycine maxD. Allium cepa |
| Answer» Correct Answer - C | |
| 203. |
Essential elements areA. Only micronutrientsB. Only macronutrientsC. C, H, O & N onlyD. Both macro and micronutrients |
| Answer» Correct Answer - D | |
| 204. |
The technique of growing plants in a nutrients solution, in complete absence of soil is called asA. aeroponicsB. water cultureC. hydroponicsD. soil culture |
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Answer» Correct Answer - C Cultivation of plants by placing the roots in the nutrient solution (in complete absence of soil) is called hydroponics. It is necessary to aerate the solution to provide roots with adequate oxygen suppyl the resylt obtained from soil-less culture may then be used to determinie deficiencies under field conditions. |
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| 205. |
Which of the following is not related to `N_(2)` fixation?A. RhizobiumB. AnabaenaC. PseudomonasD. Azotobacter |
| Answer» Correct Answer - C | |
| 206. |
Which of the following gene clusters in bacteria is responsible for nitrogen fixation ?A. nod, nif, fixB. nod, ndf, nfxC. nod, nix, nfxD. ndx, nif, fix |
| Answer» Correct Answer - 1 | |
| 207. |
`N_(2)` fixation isA. `N_(2) to NH_(3)`B. `NO_(3) to NO_(2)`C. `N_(2) to `amino acidD. both (1) and (2) |
| Answer» Correct Answer - 1 | |
| 208. |
Which gene cluster is responsible for nitrogen fixation in bacteria?A. nod, nif, fixB. nod, ndf, nfxC. nod, nix, nfxD. ndx, nif, fix |
| Answer» Correct Answer - 1 | |
| 209. |
The non-symbiotic `N_(2)` fixer isA. AnabaenaB. RhizobiumC. AzotobactorD. Azolla |
| Answer» Correct Answer - C | |
| 210. |
The nodules present in the leguminous plants appear pink in colour due to the presence ofA. RBCsB. leghaemoglobinC. nitrogenase enzymeD. bacterial secretion. |
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Answer» Correct Answer - B The nodule contains a pinkish pigment called Leghaemoglobin (Lb) which is an oxygen scavenger and protects nitrogen fixiing enzyme nitrogenase from oxygen. |
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| 211. |
Minerals are abosrbed by plants inA. colloidal formB. ionic formC. precipitated formD. None of these |
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Answer» Correct Answer - B The onorganic essential elements, which are obtained from soil are called mineral elements. Plants absorb the minerals in the form of ions. The movement of ions is called flux. |
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| 212. |
Nutrifying bacteriaA. convert free nitrogen to nitrogen compoundsB. convert proteins into ammoniaC. reduce nitrates to free nitrogenD. oxidise ammonia to nitrates |
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Answer» Correct Answer - A Nitrifying bacteria (one of the chemosynthetic bacteria) oxidise ammonia to nitrates and obtain energy for the preparation of food. This oxidation occurs in two steps. In the first step, ammonia is oxidised to nitrite by nitrite bacteria, e.g., nitrosomonas and Nitrosococcus. |
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| 213. |
Which of the following micronutrient helps in `N_(2)`-fixation?A. MoB. CaC. BoD. Na |
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Answer» Correct Answer - A Nitrogenase enzyme is required for nitrogen-fixation. It consists of two components. Fe containing unit and Mo (molybdenum) containing unit. Hence, Fe and Mo are important for niitrogenase. |
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| 214. |
Which one of the following helps in absorption of phosphorus from soil by plants or Which one of the following microbes forms symbiotic association with plants and helps them in their nutritionA. AzotobacterB. AspergillusC. GlomusD. Trichoderma |
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Answer» Correct Answer - A Several species of Glomus, including G.aggregatum, are cultured and sold as mycorrhizal inoculant for agricultural soils. Being endomycorrhiza, it helsps the plants in the absorption of nutrients especially phosphorus from soil. |
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| 215. |
Phosphorus and nitrogen ions generally get depleted in soil because they usually occur asA. neutral ionsB. negatively charged ionsC. positively charged ionsD. both positively and negatively charged but disproportionate mixture |
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Answer» Correct Answer - B In the soild, phosphorus and nitrogen are present as negatively charged ions, e.g., `H_(2)PO_(4)^(-),NO_(2)^(-),NO_(3)^(-)` ions. These are usually supplied by fertilisers as urea. |
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| 216. |
Assertion: Chelating agents used in improving the availability of some minerals in soil are actually electron acceptors. Reasoning: They increase solubility of some minerals in acidic soils.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 the 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. |
| Answer» Correct Answer - B | |
| 217. |
A : Chelating agents used in improving availability of some minerals in soil are actually electron acceptors. R : They increase solubility of some minerals in acidic soils.A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion.B. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion.C. If Assertion is true statement but Reason is false.D. If both Assertion and Reason are false statements. |
| Answer» Correct Answer - D | |
| 218. |
Due to deficiency of phosphorusA. the rate of protein synthesis is increasedB. the rate of protein synthesis is decreasedC. there is no effect on the rate of protein synthesisD. the rate of protein synthesis initially declines but increases later on |
| Answer» Correct Answer - 2 | |
| 219. |
Pungent principle, a sinigrin, of crucifers is aA. glycoside having sulphurB. glycoside having cyanideC. glycoside having special amino acidsD. tannin |
| Answer» Correct Answer - 1 | |
| 220. |
Transpiration pull or water tension in leaf is responsible for which one of the following methods of absorption of minerals by the plants from soil?A. Active absorption of mineralsB. Mass flowC. Donnan eqilibriumD. Ionic exchange |
| Answer» Correct Answer - A | |
| 221. |
Which of the following is non-symbiotic ?A. AzotobacterB. NostocC. RhizobiumD. None of this |
| Answer» Correct Answer - A | |
| 222. |
The concentration of a macroelement per gram of dry matter in plants is at leastA. 1000 `mug//g` of dry matterB. 100 `mugg/g` of dry matterC. 1500 `mug//g` of dry matterD. 995 `mug//g` of dry matter |
| Answer» Correct Answer - A | |
| 223. |
An essential element is that, whichA. improves health of the plantB. is irreplaceable and indispensable for the growth of plantsC. is found in plant ashD. is available in the soil |
| Answer» Correct Answer - B | |
| 224. |
The concentration of a macroelement per gm of dry matter in plants is at leastA. 1000 `mu g`/gm of dry matterB. 100 `mu g`/gm of dry matterC. 1500 `mu g`/gm of dry matterD. 995 `mu g`/gm of dry matter. |
| Answer» Correct Answer - 1 | |
| 225. |
What is an essential element ?A. An element present in the soil.B. An element present in the plant.C. An element that improves growth of plant.D. An element without which a plant will not grow and complete its life cycle. |
| Answer» Correct Answer - 4 | |
| 226. |
the ion which is commonly found free in the cell isA. potassiumB. borateC. sulphurD. nitrogen |
| Answer» Correct Answer - 1 | |
| 227. |
Most common free ion in a cell isA. PB. KC. FeD. B |
| Answer» Potassium is the commonest free in the cell and help to keep the cell electrically neutral and perphaps stabilises emulsions. | |
| 228. |
Which of the following is widely used metal cofactorA. `Ca^(2+)`B. `Al^(3+)`C. `Ni^(2+)`D. `Mg^(3+)` |
| Answer» Some minerals are either components of enzymes, their cofactors or activators. E.g., `Ni_(2+)` | |
| 229. |
Nitrogen is absorbed by plants in form ofA. `NO_(3)^(-)`B. `NH_(3)`C. `NO_(2)^(-)`D. both a and c |
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Answer» Correct Answer - D Plants obtain nitrogen from soil as `NO_(3)^(-)` (nitrate), `NH_(4)^(+)` (ammonium) and `NO_(2)^(-)` (nitrite) ions. Nitrate and nitrite are reduced to ammonium state which is then incorporated into amino acids, proteins and other organic substances. |
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| 230. |
The bacterium capable of anaerobic `N_(2)` fixation is known asA. AzotobacterB. RhizobiumC. BacillusD. Clostridium |
| Answer» Correct Answer - B | |
| 231. |
The process that is the opposite of nitrogen fixation isA. nitrificationB. denitrificationC. ammonificationD. nitrate reduction |
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Answer» Correct Answer - B Denitrification is the opposite process of nitrogen fixation in which nitrates `(NO_(3)^(-))` get converted into `N_(2)` gas by bacteria Pseudomonas denitrificans and Thiobacillus denitrificans. |
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| 232. |
In which of the following forms is iron absorbed by plants?A. Both ferric and ferrousB. Free elementC. FerrousD. Ferric |
| Answer» Correct Answer - 4 | |
| 233. |
In which of the following forms is iron absorbed by plantsA. Both ferric and ferrousB. Free elementC. FerrousD. Ferric |
| Answer» Correct Answer - 4 | |
| 234. |
Which mineral activates ATPase and ` alpha ` - amylase ? |
| Answer» Correct Answer - Calcium | |
| 235. |
Give the ionic form in which phosphorus is absorbed by plants. |
| Answer» `H_2 PO_(4)^(-) or HPO_(4)^(2- ) ` | |
| 236. |
Where is nitrogen required in the body of plant ? |
| Answer» Nitrogen is required by all plants of the plant, particularly the meristematic tissues and metabolically active cells. | |
| 237. |
Which element activates alcohol dehydrogenase enzymes ? |
| Answer» Correct Answer - `Zn^(2 + ) ` | |
| 238. |
Select the correct statements from the given (a) Nitrogenae is heterodimeric protein. (b) Root hairs curl by action of nitrogenase and plant not factors. (c ) During sumbiotic ` N_ 2 ` fixation ATP is provided by legumes plant.A. (b) & (c )B. (a) & (c )C. Only ( c )D. (a) & (b ) |
| Answer» Correct Answer - B | |
| 239. |
Deficiency symptoms of nitrogen and potassium are visible first inA. Senescent leavesB. Young leavesC. RootsD. Buds |
| Answer» Correct Answer - A | |
| 240. |
Deficiency symptoms of nitrogen and potassium are visible first inA. RootsB. BudsC. Senescent leavesD. Young leaves |
| Answer» N and K are mobile elements | |
| 241. |
Deficiency symptoms of nitrogen and potassium are visible first inA. BudsB. Senescent leavesC. Young leavesD. Roots |
| Answer» Correct Answer - 2 | |
| 242. |
Deficiency symptoms of readily mobilised essential elements will first appear in_____A. younger tissuesB. older tissuesC. rootsD. shoots |
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Answer» Correct Answer - B For elements that are actively mobilised within the plants and exported to young developing tissues, the deficiency symptoms tend to appear first in the older tissues e.g., the deficiency symptoms of nitrogen (N), potassium (K) and magnesium (Mg) are visible first in the senescent leaves. in the older leaves, biomolecules containing these elements are broken down, making thse elements available for mobilising to younger leaves. |
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| 243. |
Explain with examples: macronutrients, micronutrients, beneficial nutrients, toxic elements and essential elements. |
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Answer» Macronutrients: They are the nutrients required by plants in large amounts. They are present in plant tissues in amounts more than 10 m mole `kg^(–1)` of dry matter. Examples include hydrogen, oxygen, and nitrogen. Micronutrients: They are also called trace elements and are present in plant bodies in very small amounts, i.e., amounts less than 10 m mole `kg^(– 1)` of dry matter. Examples include cobalt, manganese, zinc, etc. Beneficial nutrients: They are plant nutrients that may not be essential, but are beneficial to plants. Sodium, silicon, cobalt and selenium are beneficial to higher plants. Toxic elements: Micronutrients are required by plants in small quantities. An excess of these nutrients may induce toxicity in plants. For example, when manganese is present in large amounts, it induces deficiencies of iron, magnesium, and calcium by interfering with their metabolism. Essential elements: These elements are absolutely necessary for plant growth and reproduction. The requirement of these elements is specific and non-replaceable. They are further classified as macro and micro-nutrients. |
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| 244. |
An essential element derived fromo soil only is calledA. micronutrientB. macronutrientC. mineral elementD. macroelement |
| Answer» Correct Answer - 3 | |
| 245. |
Micronutrients areA. less important than macronutrientsB. as important as macronutrientsC. having no role in plant nutritionD. omitted from culture medium without any detrimental effect. |
| Answer» Correct Answer - 2 | |
| 246. |
Importance of microelements was recognised late due toA. their toxicityB. presence as contaminants in macronutrientsC. negligible role played by them in plant physiologyD. leakage from roots. |
| Answer» Correct Answer - 2 | |
| 247. |
Legume plants are important for atmosphere because thetA. help in nitrogen fixationB. do not help in `NO_(2)` fixationC. increase soil fertilityD. possesses Rhizobium bacteria |
| Answer» Correct Answer - A | |
| 248. |
A root concentrates minerals byA. active transportB. facilitated diffusionC. osmosisD. diffusion |
| Answer» Correct Answer - 1 | |
| 249. |
The process of `N_(2)` fixation in root nodules is controlled byA. nifB. NAAC. IAAD. ABA |
| Answer» Correct Answer - 1 | |
| 250. |
Agriculturists have reported about 40-`50%` higher yields of rice by applyingA. AzollaB. Cyanophycean membersC. MycorrhizaeD. Thorn forest |
| Answer» Correct Answer - A | |