Posted on : March 24, 2020 By Team thecourseshub 1. Nitrogen cycle involves bacteria capable of changing proteins to ammonia called Decomposing bacteria Denitrifying bacteria Nitrogen-fixing bacteriaNitrifying bacteria2. Photosynthetic pigments in chloroplast are embedded in membrane ofEnvelope of chloroplast Thylakoids Photoglobin Matrix Envelope of chloroplast3. Dark reaction of photosynthesis is called so because It can also occur in dark It does not require light energy Cannot occur during day time It occurs more rapidly in night4. Fertilizers may pollute water body due toGreenhouse effectAcid rain Leaching Deforestation5. Chlorophyll molecule (PS-II) when excited, the released electron firstly goes to Plastoquinone Plastocyanin Ferredoxin Ferredoxin reducing substrate6. Pyruvate dehydrogenase is used in convertingPynurate to glucose Pyruvic acid to lactic acid Glucose to pyruvate Pyruvate to acetyl CoA7. Nitrogen content of biosphere remains constant due to Nitrogen fixation Nitrogen cycle Industrial pollution Absorption of nitrogen8. One Calvin cycle is involved in the fixation of 2 CO2 molecules 3 CO2 molecules 1 CO2 molecules 5 CO2 molecules9. The site of oxygen evolution and phostosynthetic phosphorylation in chloroplast are Matrix Grana stacks Inner wall of chloroplast Surface of chloroplast10. Chlorophyll molecule has structure like Monopyrrole Dipyrrole Tripyrrole Tetrapyrrole11. Unidirectional flow of electrons in photophosphorylation takes place in Cyclic Non-cyclic Both A & B None of these12. The fixation of CO2 requires an acceptor molecule RuBP Rubisco Oxaloacetate Citrate13. In higher plants, the photosynthetic pigments are Chl a + Chl b + anthocyanins Chal a + carotenoidChl a + Chl b + carotenoid Chl b + carotenoid + phycobilins14. Kerbs cycle is termed as the aerobic phase of respiration because It consumes oxygen Oxygen acts as a catalyst It works with ETC Carried by aerobic15. The correct sequence of electron acceptors in ATP synthesis is Cyt a, a3, b, c Cyt b,c, a, a3 Cyt b, c, a3, a Cyt c, b, a, a316. The two peaks of light absorption of Chlorophyll 'a' are near 400 and 500 nm 430 and 730 nm 430 and 660 nm 400 and 660 nm17. The trophic level of sulphur bacteria and cyanobacteria is Producer Consumer Decomposer Recycler18. Glycolysis occurs in Mitochondria Chloroplast Cytosol Nucleus 19. Link between glycolysis and Kerbs cycle is Citric acid Acetyl CoA Succinic acidOxaloacetic acid20. Ferridoxin contains Magnesium Zinc Iron Copper21. Which is not true for glycolysis? End product is CO2 and H2O Substrate level phosphorylation Production of ATP Expenditure of ATP22. Which of rhe following is the non-polar part of chlorophyll? Phytol Porphyrin Pyrrole Antenna molecule23. This is not the result of deforestation Increased biodiversity Decreased leaf canopy Increased soil erosion Low net primary productivity24. Mycorrhiza is an association between the roots of plants growing in Dry soil Alkaline soil Acidic soil Infertile soil25. In cyclic photophosphorylation, which one of the following is formed? ATP NADP and ATP NADH2 and O2ATP and O226. Type of pollution that can cause skin cancer in human Noise pollution Atmospheric pollution Soil pollution Water pollution27. A single chlorine atom can react with UV rays and destroy ozone molecule as many as 50 million 1 million 1 billion 100 billion28. During Krebs cycle, hydrogen of malate is accepted by FAD FadH2 NAD+ NADP+29. The early settlers on a barren area are Ferns Mosses Lichens Diatoms30. Which of the following is the first step of glycolysis?Breakdown of glucosePhosphorylation of glucose Conversion of glucose into fructose Dehydrogenation of glucose31. The formation of acetyl cocnzyme-A prom pyruvic acid is the result of itsReduction Dehydration Dephosphorylation Oxidative decarboxylation32. During algal blooms, oxygen depletion occurs due to excessive Mineralization Decomposition Growth of algae Denitrification33. Secondary succession occurs in/on Burnt lands Lumbered lands Cut wood lands All A, B, C34. Which of the following occurs in the Calvin cycle? Photophosphorylation Oxidative carboxylation Reductive carboxylation Oxidative phosphorylation35. A community which starts succession in a habitat is Pioneer community Seral community Biotic community Ecosers36. Global weathers are drastically disturbed due to all phenomenon except Ozone layer depletion IndustrializationGreenhouse effect Afforestation37. GTP is formed by substrate-level phosphorylation during the conversion of Auccinate to fumarate Ketoglutarate to succinate Oxalosuccinate to glutarate Fumarate to malate38. Its high level in air can lead to immediate death Oxides of nitrogen Chlorofluorocarbons Carbon monoxide Acid rain39. Krebs cycle is also known as Glyoxylate cycle Calvin cycle Citric acid cycle Glycolate cycle40. In which stage of photosynthesis, light is directly required for Electron excitation Reduction of CO2 Regulating photosystem Chemiosmosis41. In an ecosystem, the largest population is of Producers Consumers Decomposers Omnivores42. A molecule of ATP is formed when electrons pass from Cyt c to Cyt a Cyt a to Cyt c Cyt b to Cyt c Cyt c to Cyt b43. Driving forces of an ecosystem is Producer Carbohydrates in plants Biomass Solar energy44. Cytochrome helps in Oxidation of glucose Release of energy Electron transport Growth of plant45. The bacteria which attack dead animals are First link to the food chain Second link of the food chain Third link of the food chain The end of food chain46. A wolf has just eaten a lamb. When the tiger saw the wolf, attacked it and consumed it. The tiger is in ecological terms A producer A primary consumerA secondary consumerA tertiary consumer47. The conversion of nitrate to nitrous oxide and nitrogen gas is termed as Nitrification Denitrification Nitrogen fixation Ammonification48. First unstable product of Calvin cycle has2 carbon atoms3 carbon atoms4 carbon atoms6 carbon atoms49. Photosystem-II is concerned with Photolysis of water Reduction of CO2 Formation of glucose Formation of NADPH50. Cytochromes occur in Cristae of mitochondria Matrix of mitochondria Outer mitochondrial membrane Entire inner mitochondrial membrane51. The kind of pollution taht disturbs the environment hundreds or thousands of kilometers away from its source Eutrophication Acid rain Lead compounds in air Cigarette smoke52. Which of the following in an ecosystem exhibits a one-way flow rather than cyclic flow? Potassium Carbon Free energy Nitrogen53. Chlorophyll is Soluble in organic solvents Soluble in water Soluble in both organic solvents and water Insoluble54. It is the study of human populations and things that affect them Ecology Environmental Biology Demography Biogeography Time is Up!