Biology Class 11 NCERT books adaption has now been done by many State Boards. PDF download XI NCERT book of Biology for UP Board (UPMSP), Madhya Pradesh (MPBSE), CBSE Board, Gujarat Board (GSEB) from above given links. Class 11 NCERT solutions of prescribed books for Class 10 (High School / HSLC / SSLC), Class 12 (Intermediate / HSSLC / HSE) are available to download in PDF and for free reference.
photosynthesis class 11 pdf download
The UP Board Solutions for Class 11 Biology PDF download is also available for free here. From below given link you can get step by step solutions for the questions given in above class 11 textbook from the latest UP Board syllabus as per board exam guidelines.
Question 5.Identify true statement regarding light reaction of photosynthesis?(a) Splitting of water molecule is associate with PS I.(b) PS I and PS II involved in the formation of NDPH + H+.(c) The reaction center of PS I is Chlorophyll a with absorption peak at 680 nm.(d) The reaction center of PS II is Chlorophyll a with absorption peak at 700 nm.Answer:(b) PS I and PS II involved in the formation of NDPH + H+.
Question 9.In Botany class, teacher explains, Synthesis of one glucose requires 30 ATPs in C4 plants and only 18 ATPs in C3 plants. The same teacher explains C4 plants are more advantageous than C3 plants. Can you identify the reason for this contradiction?Answer:C4 plants requires 30 ATPs and 12 NADPH + H+ to synthesize one glucose, but C3 plants require only 18 ATPs and 12 NADPH + H+ to synthesize one glucose molecule. If then, how can you say C4 plants are more advantageous? C4 plants are more advantageous than C3 plants because C4 photosynthesis is advantages over C3 plant, because C4 photosynthesis avoids photorespiration and is thus potentially more efficient than C3 plants. Due to the absense of photorespiration, carbon di oxide compensation point for C4 is lower than that of C3 plants.
Question 10.When there is plenty of light and higher concentration of O2, what kind of pathway does the plant undergo? Analyse the reasons.Answer:The rate of photosynthesis decreases when there is an increase of oxygen concentration. This Inhibitory effect of oxygen was first discovered by Warburg (1920) using green algae, Chlorella.
Question 2.Who has first explained the importance chlorophyll in photosynthesis:(a) Joseph Priestly(b) Dutrochet(c) Stephen Hales(d) LovoisierAnswer:(b) Dutrochet
Question 3.How many million tonnes of dry matter produced annually by photosynthesis?(a) 1700 million tonnes(b) 1900 million tonnes(c) 1400 million tonnes(d) 2000 million tonnesAnswer:(a) 1700 million tonnes
Question 4.Who received 1988 Nobel prize for his work on photosynthesis in Rhodobacter:(a) Emerson and Arnold(b) Ruben and Kamem(c) Arnon, Allen and Whatley(d) Huber, Michael and DissenhoferAnswer:(d) Huber, Michael and Dissenhofer
Question 27.The important external factors affecting photosynthesis are:(a) light, chlorophyll, temperature(b) light, stomatal opening, oxygen(c) light, protoplasmic factor, oxygen(d) light, CO2 and oxygenAnswer:(d) light, CO2 and oxygen
Question 28.Hormones like gibberellin:(a) increases the rate of photosynthesis(b) increase respiration(c) decrease the rate of photosynthesis(d) decrease the rate of transpirationAnswer:(a) increases the rate of photosynthesis
Question 29.Bacterial photosynthesis differs from higher plant photosynthesis in:(a) utilizing water as electron donar(b) releasing O2(c) releasing sulphur instead of oxygen(d) utilizing SO2 as electron donarAnswer:(c) releasing sulphur instead of oxygen
Question 2.Define photosynthesis.Answer:Photosynthesis is referred as photochemical oxidation and reduction reactions carried out with help of light, converting solar energy into Chemical energy.
Question 3.What is the site of photosynthesis?Answer:Chloroplasts are the main site of photosynthesis and both energy yielding process (Light reaction) and fixation of carbon dioxide (Dark reaction) that takes place in chloroplast.
Question 6.Define photosynthetic pigment.Answer:A photosynthetic pigment is a pigment that is present in chloroplasts or photosynthetic bacteria which captures the light energy necessary for photosynthesis.
Question 16.What is meant by carbon dioxide compensation point?Answer:When the rate of photosynthesis equals the rate of respiration, there is no exchange of oxygen and carbon dioxide and this is called as carbon dioxide compensation point.
Question 19.How does water affect the rate of photosynthesis?Answer:Photolysis of water provides electrons and protons for the reduction of NADP, directly. Indirect roles are stomatal movement and hydration of protoplasm. During water stress, supply of NADPH + H+ is affected.
2. Action Spectrum: The effectiveness of different wavelength of light on photosynthesis is measured by plotting against quantum yield. The curve showing the rate of photosynthesis at different wavelengths of light is called action spectrum. From the graph showing action spectrum, it can be concluded that maximum photosynthesis takes place in blue and red region of the spectrum. This wavelength of the spectrum is the absorption maxima for Chlorophyll (a) and Chlorophyll (b). The Action Spectrum is instrumental in the discovery of the existence of two photosystems in O2 evolving photosynthesis. 2ff7e9595c
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