{"id":88231,"date":"2021-06-21T17:42:36","date_gmt":"2021-06-21T12:12:36","guid":{"rendered":"https:\/\/kseebsolutions.guru\/?p=88231"},"modified":"2021-07-01T20:21:50","modified_gmt":"2021-07-01T14:51:50","slug":"1st-puc-biology-question-bank-chapter-13","status":"publish","type":"post","link":"https:\/\/kseebsolutions.guru\/1st-puc-biology-question-bank-chapter-13\/","title":{"rendered":"1st PUC Biology Question Bank Chapter 13 Photosynthesis in Higher Plants"},"content":{"rendered":"

Karnataka 1st PUC Biology Question Bank Chapter 13 Photosynthesis in Higher Plants<\/h2>\n

1st PUC Biology Photosynthesis in Higher Plants One Marks Questions and Answers<\/h3>\n

Question 1.
\nGive the general equation for photosynthesis.
\nAnswer:
\n\"1st<\/p>\n

Question 2.
\nName the active pigment involved in photosynthesis.
\nAnswer:
\nChlorophyll.<\/p>\n

\"1st<\/p>\n

Question 3.
\nName the first stable intermediate compound formed during calvin cycle.
\nAnswer:
\nPhosphoglyceric acid (PGA).<\/p>\n

Question 4.
\nWhat is the Red drop effect?
\nAnswer:
\nDecrease in the rate of photosynthesis when only red light of longer wave length is supplied is called Red drop effect.<\/p>\n

Question 5.
\nWhat is Emerson\u2019s Enhancement effect?
\nAnswer:
\nIt is the increase in the photosynthetic rate, when red light of shorter, and longer wave lengths are supplied intermittently.<\/p>\n

Question 6.
\nDefine solarisation?
\nAnswer:
\n2000-2500 foot candles of light intensity is optimum for photosynthesis. Higher intensity of sunlight causes photooxidation (bleaching) of photosynthetic pigments. This is referred to as solarisation.<\/p>\n

Question 7.
\nWhat is photoionization of water?
\nAnswer:
\nSplitting of water using Zn+2<\/sup> & Cl–<\/sup>\u00a0to form protons, electrons and release of molecular oxygen.
\n\"1st<\/p>\n

Question 8.
\nWhy do you regard calvin cycle as a C3<\/sub> pathway?
\nAnswer:
\nThe first stable product formed during calvin cycle is phosphoglyceric acid, a3C compound. Hence this cycle is called C3<\/sub> pathway.<\/p>\n

\"1st<\/p>\n

Question 9.
\nName the metallic ion associated with chlorophyll molecule.
\nAnswer:
\nMg+2<\/sup> (Magnesium ion).<\/p>\n

Question 10.
\nName the energy currency of the cell?
\nAnswer:
\nATP Molecules<\/p>\n

Question 11.
\nState Blackmann\u2019s law of limiting factors?
\nAnswer:
\nIt states that \u201cwhenever a reaction is conditioned to its rapidity by many separate factors then the rate of the reaction depends on the slowest factor\u201d.<\/p>\n

Question 12.
\nWhat is the site of the dark reaction of photosynthesis?
\nAnswer:
\nStroma of the chloroplast.<\/p>\n

\"1st<\/p>\n

Question 13.
\nWhat are C3<\/sub> Plants?
\nAnswer:
\nC3<\/sub> plants are those in which during dark reaction the stable compound formed will be is phosphoglyceric acid, a 3C compound.<\/p>\n

Question 14.
\nName the first stable compound produced in CAM plants.
\nAnswer:
\nOxalo acetic, acid.<\/p>\n

Question 15.
\nName the primary CO2<\/sub> acceptor in C4<\/sub> plants.
\nAnswer:
\nPhosphoenol pyruvic acid.<\/p>\n

Question 16.
\nBy. looking at a plant externally can you tell whether a plant is C3<\/sub> or C4<\/sub>? Why and how?
\nAnswer:
\nIt is not possible to do so, because only in the anatomy there is a difference between C3<\/sub> and C4<\/sub> plants.<\/p>\n

1st PUC Biology Photosynthesis in Higher Plants Two Marks Questions and Answers<\/h3>\n

Question 1.
\nDraw a neat labelled diagram of a chloroplast?
\nAnswer:
\n\"1st<\/p>\n

Question 2.
\nWhat are the end products of light reaction of photosynthesis?
\nAnswer:
\nThe end products of light reaction are ATP, and NADPH2<\/sub>.<\/p>\n

\"1st<\/p>\n

Question 3.
\nList any four differences between cyclic and non-cyclic photosynthesis.
\nAnswer:<\/p>\n\n\n\n\n\n\n\n
Cyclic<\/strong><\/td>\nNon-CycIic<\/strong><\/td>\n<\/tr>\n
1. It involves only PS I.<\/td>\n1. It involves both PS I and PS II.<\/td>\n<\/tr>\n
2. Here photolysis of water takes place.<\/td>\n2 Here photolysis of water does not take place.<\/td>\n<\/tr>\n
3. Only ATPs are synthesised.<\/td>\n3. Assimilatory synthesised, powers ATPs, and NADPH, are synthesised.<\/td>\n<\/tr>\n
4. Here the lost electrons from PS I are returned to dil a.<\/td>\n4. Here, the lost electrons from PS I return back to PS I and PS II does not return them back.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Question 4.
\nGive the schematic representation of a cyclic photo phosphorylation.
\nAnswer:
\n\"1st<\/p>\n

Question 5.
\nWrite any four differences between light and dark reactions of photosynthesis.
\nAnswer:<\/p>\n\n\n\n\n\n\n\n
Light Reaction<\/strong><\/td>\nDark Reaction<\/strong><\/td>\n<\/tr>\n
1. It depends on light<\/td>\n1. It is independent of light.<\/td>\n<\/tr>\n
2 It occurs in the grana of chloroplast<\/td>\n2 It occurs in stroma of chloroplast.<\/td>\n<\/tr>\n
3. Here photolysis of water takes place.<\/td>\n3. Here photolysis of water does not takes place.<\/td>\n<\/tr>\n
4. Here CO2<\/sub> fixation does not takes place.<\/td>\n4. Here CO2<\/sub> fixation takes place.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\"1st<\/p>\n

Question 6.
\nExplain the law of limiting factors with an example.
\nAnswer:
\nThe law of limiting factor states that \u201cwhen a process is governed by a number of separate factors, the rate of the process is limited by the pace of the slowest factor\u201d. Photosynthesis is influenced by several factors such as CO2<\/sub> concentration, availability of water, sun light etc. Any of these factors may become a limiting factor at any one moment, and may limit the rate of photosynthesis.<\/p>\n

Question 7.
\nWhat is krantz anatomy? Give two examples of plants with krantz anatomy.
\nAnswer:
\nThe presence of a chlorenchymatous bundle sheath is known as krantz anatomy.
\ne.g: Sugarcane, maize etc.<\/p>\n

Question 8.
\nBy looking at which internal structure of a plant, can you tell whether a plant is C3<\/sub> or C4<\/sub>? Explain.
\nAnswer:
\nC4<\/sub> plants contains krantz antonomy which is absent in C3<\/sub> plants.<\/p>\n

Question 9.
\nEven though only few cells in a C4<\/sub> plant carry out the biosynthetic – Calvin pathway, they are highly productive. Can you describe why?
\nAnswer:
\nAs Carbon dioxide fixation is very effective in C4<\/sub> plants, and no accumulation of products in bundle sheath cells takes place, C4<\/sub> plants are highly productive.<\/p>\n

\"1st<\/p>\n

Question 10.
\nRuBisCO is an enzyme that acts both as a carboxylase and an oxygenase. Why do you think RuBisCO carries out more carboxylation in C4<\/sub> plants?
\nAnswer:
\nBundle sheath cells are richly supplied with CO2<\/sub>. Under conditions of high CO2<\/sub> concentration RuBisCO functions only as carbonoylase.<\/p>\n

Question 11.
\nWhy is the colour of a leaf kept in the dark frequently turns yellow, or pale green ? Which pigment do you think is more stable?
\nAnswer:
\nThe discolourisation takes place due to degeneration of chlorophyll. Carotenoids are not affected by the absence of light and are more stable.<\/p>\n

Question 12.
\nGive comparison between the following:
\n(a) C3<\/sub> and C4<\/sub> pathways.
\n(b) Cyclic and non-cyclic photophosphorylation.
\n(c) Anatomy of a leaf in C3<\/sub> and C4<\/sub> plants.
\nAnswer:
\n(a) C3<\/sub> plants — C4<\/sub> plants:
\n1. Possess parenchymatous or sclerenchymatous bundle sheath.– Posses chlorenchymatous bundle sheath (Krantz anatomy).
\n2. Perform C3 — <\/sub>Perform C4
\n<\/sub>3. Primary CO2<\/sub> acceptor is RUBP — Primary CO2<\/sub> acceptor is PEP
\n4. First stable compound formed is PGA (3C). — First stable compound formed is oxalo acetic acid.<\/p>\n

\"1st<\/p>\n

(b)<\/p>\n\n\n\n\n\n\n\n
Cyclic<\/strong><\/td>\nNon-CycIic<\/strong><\/td>\n<\/tr>\n
1. It involves only PS I.<\/td>\n1. It involves both PS I and PS II.<\/td>\n<\/tr>\n
2. Here photolysis of water takes place.<\/td>\n2 Here photolysis of water does not take place.<\/td>\n<\/tr>\n
3. Only ATPs are synthesised.<\/td>\n3. Assimilatory synthesised, powers ATPs, and NADPH, are synthesised.<\/td>\n<\/tr>\n
4. Here the lost electrons from PS I are returned to dil a.<\/td>\n4. Here, the lost electrons from PS I return back to PS I and PS II does not return them back.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

(c) C3<\/sub> plants:
\n1. Possess parenchymatous or or scierenchymatous bundle sheath.
\n2. Typical granal chioroplasts in Mesophyilcells.<\/p>\n

C4<\/sub> plants:
\n1. Possess chiorenchymatous bundle sheath.
\n2. Typical granal chloroplast in mesophyll cells but granal chioro plasts in bundle sheath cells.<\/p>\n

1st PUC Biology Photosynthesis in Higher Plants Five Marks Questions and Answers<\/h3>\n

Question 1.
\nWrite the schematic representation of non-cyclic photophosphorylation.
\nAnswer:
\nNon-cyclic photophosphorylation is also called \u2018Z\u2019 scheme electron transport. In this cycle, the electrons lost by chlorophyll pigment do not return to the same molecule. Both PS I, and PS II are utilised.
\nOne molecule of ATP is formed.
\nTwo molecules of NADPH2<\/sub> are formed.
\nOne molecule of O2<\/sub> is formed.
\n\"1st<\/p>\n

\"1st<\/p>\n

Question 2.
\nGive the schematic representation of Calvin cycle\/C3<\/sub> pathway.
\nAnswer:
\nIt occurs in grana of the chioroplast.
\nIt utilises the assimilatory powers i.e., ATP and NADPH2<\/sub> produced in light reaction.
\n\"1st
\nAnswers:<\/p>\n

1. Phosphorylation
\n2. Carbon dioxide fixation
\n3. Phosphorylation and reduction.
\n4. Regeneration and RUMP
\n5. Glucose formation.<\/p>\n

Note:- To complete a Calvin cycle, 18 ATPs and 12 NADPH2<\/sub> molecules are required.<\/p>\n

\"1st<\/p>\n

1st PUC Biology Photosynthesis in Higher Plants Text Book Questions and Answers<\/h3>\n