CBSE Questions for Class 11 Medical Biology Photosynthesis In Higher Plants Quiz 7 - MCQExams.com

Chemiosmosis is a universal mechanism by which organisms harvest and store energy.

Which of the following best describes the process?
  • It is the process of whereby a proton gradient drives an energy-requiring reaction.
  • It is the process used to move protons up a concentration gradient for subsequent production of ATP
  • It is the process that uses pumps to drive chemicals across the membrane.
  • It is the movement of specific chemicals against its gradient coupled to the flow of protons down its concentration gradient.
Photorespiration is an alternative process that some plants undergo under stressful environmental conditions. Which of the following best describes conditions that would most likely lead to a plant undergoing photorespiration?
  • High temperature and open stomata which leads to a build up of carbon dioxide in the leaf.
  • High temperatures and closed stomata which leads to a build up of oxygen gas in the leaf.
  • High temperature and closed stomata which leads to a build up of water and carbon dioxide in the leaf.
  • Low temperature and closed stomata which leads to a build up of water and oxygen gas in the leaf.
  • Low temperature and open stomata which leads to a build up of oxygen gas in the leaf.
NADP is the abbreviation of
  • Nicotinamide adenosine dinucleostide phosphate.
  • Nicotinamide adenine dinucleostide phosphate.
  • Nicotinamide adenine dinucleous phosphate.
  • Nicotinamide adenosine dinucleous phosphate.
In Kranz anatomy, the bundle sheath cells have:
  • Thin walls, many intercellular spaces and no chloroplast
  • Thick walls, no intercellular spaces and large number of chloroplasts
  • Thin walls, no intercellular spaces and several chloroplasts
  • Thick walls, many intercellular space and few chloroplasts
Which of the following characteristics out of I, II and III are exhibited by $$C_4$$ plants?
I. Kranz anatomy.
II. The first stable product of photosynthesis is oxalo acetic acid.
III. Both PEP carboxylase and ribulose-bis phosphate carboxylase act as carboxylating enzyme.
Choose the correct option.
  • I and II, but not III
  • II and Ill, but not I
  • I and lII, but not II
  • All of these
Photorespiratory reactions are operated in the
  • Chloroplasts, ribosomes and peroxisomes.
  • Chloroplasts, mitochondria and peroxisomes.
  • Mitochondria, preoxisomes and lysosomes.
  • Mitochondria, chloroplasts and ribosomes.
$$C_4$$ pathway is advantageous over $$C_3$$ pathway in plants as it
  • Occurs in relatively low $$CO_2$$ concentration
  • Uses more amount of water
  • Occurs in relatively low $$O_2$$ concentration
  • Is less efficient in energy utilization
The entire reaction of C$$_4$$ pathway takes place in the
  • Mesophyll and bundle sheath cells.
  • Vascular bundle and palisade tissue.
  • Mitochondria and peroxisome.
  • Bundle sheath cells and endoplasmic reticulum.
The correct sequence of organelles in which glycolate and glyoxylate are produced sequentially in photorespiration is
  • Chloroplast and mitochondria
  • Chloroplast and peroxisome
  • Peroxisome and mitochondria
  • Peroxisome and chloroplast
The $${C}_{4}$$ plants differ from $${C}_{3}$$ plants with respect to the
  • Substance that accepts $$C{O}_{2}$$ in carbon assimilation.
  • Type of end product.
  • Type of pigment involved in photosynthesis.
  • Number of ATP that is consumed in preparing sugar.
Kranz anatomy is found in case of
  • Flower
  • Root
  • Leaf
  • Stem
The two enzymatic activities associated with RUBISCO are
  • Oxidase and oxygenase
  • Oxygenase and carboxylase
  • Oxidase and carboxylase
  • Oxygenase and carbamylation
Phosphoenol pyruvate (PEP) is the primary CO2CO2 acceptor in:
  • $$C_3$$ and $$C_4$$ plants
  • $$C_3$$ plants
  • $$C_4$$ plants
  • $$C_2$$ plants
$$Na^+, K^+$$ pump is found in membranes of many cells, like nerve cells. It work against electro chemical gradient and involve an integral protein ATP. For each molecule of ATP used
  • 3 ions of $$Na^+$$ pumped out and 2 $$K^+$$ are taken in.
  • 3 ions of $$Na^+$$ are taken in and 2 $$K^+$$ are pumped out.
  • 2 ions of $$Na^+$$ are thrown out and 3 $$K^+$$ are absorbed.
  • 3 ions of $$K^+$$ are absorbed and 3 $$Na^+$$ are pumped out.
The mechanism of ATP formation both in mitochondria and chloroplast is best explained by
  • Relay pump theory of Godlewski
  • Cholondy - Wents model
  • Cheimoosmotic theory
  • Munch's mass flow hypothesis
Match the columns:
Column IColumn II
(a) Hatch and Slack(i) Electron microscope
(b) Theophratus(ii) Citric acid cycle
(c) Knoll and Ruska(iii) Micrographia
(d) Robert Hooke(iv) $${C}_{4}$$ Pathways
(v) Historia Plantarum
  • (a)-(iv); (b)-(v); (c)-(i); (d)-(ii)
  • (a)-(iv); (b)-(v); (c)-(i); (d)-(iii)
  • (a)-(ii); (b)-(iv); (c)-(v); (d)-(iii)
  • (a)-(ii); (b)-(iii); (c)-(iv); (d)-(i)
In $$C_4$$-plants, Calvin cycle enzymes are absent in
  • Mesophyll chloroplasts
  • Bundle sheath chloroplasts
  • Guard cell chloroplasts
  • Epidermal chloroplasts.
Chemiosmosis was first described by
  • Boyer
  • Walker
  • Mitchell
  • Meischer
Photophosphorylation consists of
  • Cyclic and non-cyclic phosphorylation
  • Oxidative phosphorylation
  • Substrate phosphorylation
  • None of the above.
Oxysomes were discovered by
  • Palade
  • Benda
  • Fernandes-Moran
  • Luch and Rich
Match the following
a.Bacteria1.Synthesis and storage of lipids
b.Sphaerosomes2.Idiogram
c.Chloroplasts3.Glycocalyx
d.Karyotype4.Thylakoids
  • a-3, b-1, c-4, d-2
  • a-3, b-1, c-2, d-4
  • a-4, b-3, c-2, d-1
  • a-1, b-2, c-3, d-4
  • a-3, b-2, c-4, d-1.
Glycolate metabolism occurs in
  • Lysosome
  • Ribosomes
  • Glyoxysomes
  • Peroxisome
In $$C_4$$-plants, photosystem II is absent in chloroplasts of
  • Mesophyll cells
  • Bundle sheath cells
  • Palisade cells
  • Spongy cells.
Cell organelle taking part in photorespiration is
  • Glyoxisome
  • Peroxisome
  • Dictyosome
  • E.R.
The excess energy of electron is used in the synthesis of
  • Organic compounds
  • ATP from ADP and iP
  • $$NADPH_2$$ from $$NADP$$
  • None of the above
Which cellular part is correctly described
  • Thylakoids - Flattened membranous sacs forming grana
  • Centrioles - Sites for active RNA synthesis
  • Ribosomes - Those in chloroplasts are larger (80 S) while those in cytoplasm are smaller (70 S)
  • Lysosomes - Opimally active at 8.5 pH.
Agranal chloroplasts are found in some ____________.
  • Succulents
  • Hydrophytes
  • $$C_4$$ plants
  • $$C_3$$ plants.
Energy required to synthesise ATP from ADP and inorganic phosphate is
  • 2500 cal
  • 7600 cal
  • 12000 cal
  • 20000 cal
Reduction means
  • Loss of electrons
  • Gain of electrons
  • Gain of protons
  • Loss of protons and electrons
$$C_4$$ plants are adapted to
  • Temperate humid climate
  • Tropical humid climate
  • Temperate dry climate
  • Tropical dry climate
Kranz anatomy is found in (A)  (B) (C)  (D) 
  • Stems of $$C_4$$ plants
  • Stems of $$C_3$$ plants
  • Leaves of $$C_4$$ plants
  • Leaves of $$C_3$$ plants.
Excited pigment molecule shifts an electron in an outer orbit having
  • Less energy
  • More energy
  • Lesser spin
  • More spin
Energy required for ATP synthesis in PS II comes from
  • Proton gradient
  • Electron gradient
  • Reduction of glucose
  • Oxidation of glucose
Calvin cycle operates in chloroplasts. Where does Hatch-Slack pathway occur
  • Mitochondria
  • Golgi bodies
  • Chloroplasts
  • Cytoplasm.
The source of hydrogen for carbon assimilation during photosynthesis is
  • $$NADPH$$
  • $$FADH_2$$
  • $$H_2O$$
  • $$RuBP$$.
ATP is injected in cyanide poisoning because it is
  • Necessary for cellular functions
  • Necessary for $$Na^+$$ - $$K^+$$ pump
  • $$Na^+$$ - $$K^+$$ pump operates at the cell membranes
  • ATP breaks down cyanide
In non-cyclic photophosphorylation the electron released by $$P_{680}$$ is replaced by
  • Plastoquinone
  • Water
  • $$CO_2$$
  • $$NADP^+$$.
Dark reaction in photosynthesis is called so because
  • It can occur in dark alone.
  • It does not require direct light energy.
  • It cannot occur during day time.
  • It occurs more rapidly at night.
In case of $$C_4$$-pathway
  • $$CO_2$$ combines with PGA
  • $$CO_2$$ combines with PEP
  • $$CO_2$$ first combines with RuBP
  • $$CO_2$$ combines with RMP
Which one is most efficient converter of sunlight?
  • Sugarcane
  • Rice
  • Wheat
  • Papaya.
ATP synthesis proposed by Peter Mitchell is 
  • Phosphorylation
  • Photophosphorylation
  • Oxidative phosphorylation
  • Chemiosmotic synthesis
Photophosphorylation is the process in which 
  • $$CO_2$$ and $$O_2$$ unite.
  • Phosphoglyceric acid is produced.
  • Aspartic acid is formed.
  • Light energy is converted into chemical energy through production of ATP.
When cell converts light energy into chemical energy, which of the following reaction would take place?
  • ADP + iP = ATP
  • ATP - iP = ADP
  • AMP + iP = ADP
  • GDP + iP = GTP
Dark reaction of photosynthesis occurs in
  • Grana
  • Stroma
  • Matrix
  • Cytoplasm
Assimilatory power produced in Hill reaction and used in Blackman's reaction refers to
  • Generation of ATP and NADPH$$_2$$
  • Reduction of CO$$_2$$
  • Splitting of water
  • Disintegration of plastids
Chemiosmotic theory of ATP synthesis in chloroplasts and mitochondria is based on _______________.
  • Membrane potential
  • Accumulation of $$Na^+$$ ions
  • Accumulation of $$K^+$$ ions
  • Proton gradient
In $$C_4$$ plants, synthesis of sugars/final $$CO_2$$ fixation occurs in
  • Palisade cells
  • Spongy cells
  • Undifferentiated mesophyll cells
  • Bundle sheath cells
Which is a 4-carbon compound?
  • Oxaloacetic acid
  • Citric acid
  • Phosphoglyceric acid
  • Phosphoenolpyruvate
  • Ribulosebiphosphate
ATP does not provide phosphate in the reaction
  • Glucose Glucose 6-P
  • Fructose Fructose 6-P
  • PGAL 1 : 3-diPGA
  • PEPA Pyruvic acid
PEP is $$CO_2$$ acceptor in
  • $$C_4$$ plants
  • $$C_3$$ plants
  • $$C_2$$ plants
  • Both A and B
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