Biology Chapter 11 – Bioenergetics (Class 11) for FSC & Entry Test Preparation
Chapter 11, Bioenergetics, is an essential topic for Class 11 students preparing for FSC board exams and medical/engineering entry tests like MDCAT, NUMS, AKU, NUST, ECAT, and UET. This chapter explains how living organisms obtain, store, and use energy to carry out vital biological processes. Understanding bioenergetics is crucial for grasping metabolism, respiration, and energy flow in cells.
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The organisms able to use sunlight directly as a source of energy are
Which is the correct order of energy transfer from assessory pigments to main photosynthetic pigment?
Lactic Acid Fermentation is a type of anaerobic respiration that occurs in human muscle cells. It yields only ____ % of the energy present in a glucose molecule.
NUMS 2019 Reconduct
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At which times there is no net gaseous exchange between leaves and the atmosphere.
Glucose → 2 pyruvic acid + 2H2O
2ADP + 2Pi → 2 ATP
2NAD + 4H → 2NADH + 2H+
These three reactions collectively constitute ______.
NTS 2012
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Its membranes are the sites where sunlight energy is trapped and where glucose is formed.
Which organelle is this?
NUMS 2014
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Which of the following statement about the head of a chlorophyll molecule is incorrect:
How does chemosynthesis differ from photosynthesis?
NUMS 2020
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Which of the following processes does NOT need Pyruvic Acid as a substrate?
PMC 2020
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Three word equations are shown:
P. Carbon dioxide + water gives glucose + oxygen
Q. Glucose + oxygen gives carbon dioxide + water
R. Glucose gives alcohol + carbon dioxide
What is / are the equations for anaerobic respiration in yeast?
NTS 2015 SMBBMC
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Molecular formula of chlorophyll ‘a’ molecule is:
FADH2 is produced during which step of Krebs cycle?
NUMS 2015
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Estimating relative CO2 consumption or O2 release during photosynthesis at different wavelengths of light, is termed as:
NUMS 2019 Reconduct
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In paper chromatography xanthophyll will give ______ color:
NTS 2010
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In the Calvin cycle, the reducing power from NADPH is used during:
NUMS 2019 Reconduct
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Pyruvic acid is the end product of:
NTS 2017
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Photosynthesis is process in which ________ compounds of carbon (CO2) and hydrogen (H2O) are reduced to carbohydrate like (glucose) using light energy.
Van neil hypothesis about the production of oxygen during phosynthesis was based on the study and investigations on
Chlorophyll is insoluble in:
Light reaction takes place on/in
Which of the following is a chemical link between catabolism and anabolism?
The main process that occurs in the dark reaction in photosynthesis is:
NTS 2010
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Many substances which are urgently required by the cell while cell absorbs them against the concentration gradient by utilizing energy in the form of:
NUMS 2019 Reconduct
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The process by which one molecule of Glucose splits up into molecules of Pyruvate is called:
NTS 2018
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Cyanides are potent poisons of the living organism and can kill by inhibiting _____, essential for cellular respiration:
NUMS 2020
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The end product of glycolysis in anaerobic respiration is:
PMC 2020
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Exposure to ______ light is effective in photosynthesis as it enables guard cells to take up K+ and open the stomata.
NUMS 2015
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Which of the following light is least absorbed by the plants:
FADH2 is produced during which step of the Krebs cycle?
NUMS 2019 Reconduct
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Visible light used in photosynthesis ranges from:
C6H12O6 + 6O2 ? 6CO2 + 6H20 + ENERGY represents:
Which of the light is mainly absorbed by the plants:
Which component enters into mitochondria after glycolysis?
NUMS 2015
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Estimating relative CO2consumption or O2release during photosynthesis at different wavelengths of light, is termed as:
NUMS 2015
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The light dependent reaction of photosynthesis occurs in:
NTS 2011
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Dark reaction of photosynthesis takes place in _______ of chloroplast.
NUMS 2020
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NAD is an example of ______:
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1 NADH in respiratory chain produces:
NUMS 2015
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Aerobic respiration results in how much ATP?
NUMS 2016
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Where do the light – dependent reactions of photosynthesis occur?
NTS 2016 SMBBMC
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What is the function of Ribulose?
PMC 2020
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RuBP + O2 —Rubisco—> PGA + _______
NTS 2016 DUHS & JSMU
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Chlorophyll molecule resemble the haem group of hemoglobin, the main difference between these two molecule is that chlorophyll has ____ ion.
NUMS 2019 Reconduct
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Immediate source of energy for cellular respiration is:
NUMS 2016
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Which part of the cell does glycolysis occur in?
NTS 2018
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Net yield of H2O in Photosynthesis is
3-Phosphoglycerate in the presence of ATP and reduced NADP (from the light-dependent stage) is reduced to:
NUMS 2020
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Which of the following is a copper containing protein in electron transport chain?
PMC 2020
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Exposure to ______ light is effective in photosynthesis as it enables guard cells to take up K+ and opening of stomata.
NUMS 2019 Reconduct
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Stroma of chloroplast carries the fixation of:
NUMS 2014
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Of the following which one is not an energy releasing process?
During cellular respiration NADH2 produces:
NUMS 2014
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Quantitative study of energy relationships in biological systems obeys.
During the first three steps of glycolysis, glucose is converted to Fructose 1, 6-diphosphate by the rearrangement of the molecule and addition of two phosphate groups. The phosphate comes from?
NTS 2015 SMBBMC
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In electron transport chain, ATP synthesis takes place when electrons move from:
PMC 2020
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Photophosphorylation takes place in the _____ of the chloroplasts:
PMC 2020
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The point at which there is no net exchange of gases between leaves and atmosphere is known as
In the Krebs cycle, substrate-level phosphorylation accompanies the formation of:
NTS 2013
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Which of the following pigment is Blue- green in colour:
NADH produces how many ATP?
NUMS 2016
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The dark reactions of photosynthesis are characterized by:
NTS 2016 DUHS & JSMU
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First stable compound during Calvin cycle is:
PMC 2020
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The end product of Glycolysis is:
NTS 2011
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Carbon dioxide joins the photosynthetic pathway at:
NTS 2018
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Which of the following is a compensation point:
The oxidation of PGAL during glycolysis yields ____ molecules.
NUMS 2019 Reconduct
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The inner membrane of mitochondrion has many infoldings into the inner chamber, these folding are called as:
NUMS 2019 Reconduct
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Key Concepts about Bioenergetics
The chapter explains the principles of energy transformation in biological systems, including the concepts of free energy, ATP as the energy currency, and the role of enzymes in energy transfer. It covers cellular respiration, including glycolysis, the Krebs cycle, and oxidative phosphorylation, as well as photosynthesis in plants, emphasizing light-dependent and light-independent reactions. Each concept is explained with examples, chemical pathways, and significance in living organisms. These concepts are highly important for FSC board exams and entry tests like MDCAT, NUMS, AKU, and NUST.
Free Entry Test Preparation
Mastery of bioenergetics helps students understand metabolism, energy flow, and the chemical basis of life processes. PLS Academy provides practice questions, solved past papers, and chapter-wise MCQs to help students revise these topics effectively. Regular study of this chapter improves problem-solving skills, conceptual clarity, and exam performance, ensuring students are well-prepared for both board exams and competitive entry tests.
JazakAllah.
