CBSE Class 11 Biology MCQs Set B

Question. In animals the product of anaerobic respiration is:
(a) Butyric acid
(b) Alcohol
(c) Glucose
(d) Lactic acid
Ans. D

Question. The process of Glycolysis takes place in:
(a) Mitochondria
(b) Cytoplasm 
(c) Stroma 
(d) Granum
Ans. B

Question. In electron transport chain, one pair of electrons passing from NADreduced to oxygen produces
(a) 4 ATP
(b) 3 ATP
(c) 2 ATP
(d) 1 ATP
Ans. B

Question. From which of the following plants gain weight?
(a) Respiration
(b) Transpiration
(c) Photosynthesis 
(d) Fermentation
Ans. C

Question. Cambium is responsible for increase in:
(a) Length
(b) Photosynthesis 
(c) Diameter 
(d) Transpiration
Ans. C

Question. In which of the following cells elongate parallel to the long axis of the stem or root?
(a) Pith
(b) Trachieds
(c) Cortex 
(d) Parenchyma
Ans. B

Question. Spiral thickenings of the walls of cells occur in:
(a) Parenchyma
(b) Chlorenchyma
(c) Xylem vessels 
(d) Cortex
Ans. C

Question. The molecule which actually enters the Krebs cycle is:
(a) Pyruvic acid
(b) Acetyl-CoA
(c) Oxao acetic acid 
(d) Fumaric acid
Ans. B

Question. In the Krebs cycle oxaloacetic acid reacts with:
(a) Pyruvic acid
(b) Citric acid
(c) Acetyl-CoA
(d) Succinic acid
Ans. C

Question. One ATP molecule is generated during the Krebs cycle in the step:
(a) citric acid ———– Alpha Ketoglutatic acid
(b) Alpha Ketoglutatic acid ——- Succinic acid
(c) Succinic acid —————- Fumaric acid
(d) Fumaric acid———– Malic acid
Ans. B

Question. It involves the liberation of Oxygen and absorbtion of CO2
(a) Aerobic respiration 
(b) Anaerobic respiration
(c) Photosynthesis
(d) Both A & B
Ans. C

Question. At the end of the electron transport chain during respiration, electrons are accepted by:
(a) NAD
(b) FAD
(c) Oxygen
(d) Hydrogen
Ans. C

Question. During growth fibers elongate greatly:
(a) At right angle to the long axis
(b) Parallel to the long axis
(c) Obliquely to the long axis 
(d) In all directions
Ans. B

Question. Which of these is the naturally occurring auxins?
(a) Indole acetic acid 
(b) 2, 4-D 
(c) Abscisic acid 
(d) Butyric acid
Ans. A

Question. The application of Auxin in small amount:
(a) Stimulate the growth of leaves
(b) Retard the growth of leaves
(c) Suppress the growth of leaves
(d) Does not affect the growth of laves
Ans. D

Question. Which of these increases the growth rate of isolated cells in a test tube?
(a) Auxins
(b) Cytokinins 
(c) Gibberellins 
(d) None of these
Ans. B

Question. Chrysanthemum indicum is a:
(a) Short day plant 
(b) Long day plant 
(c) Day neutral plant 
(d) Both A & B
  Ans. A

Question. Thigmotropism is a growth movement in response to:
(a) sunlight
(b) gravity
(c) water
(d) touch
Ans. D

Question. Which one of the following properties are shared by photosynthesis and aerobic respiration?
(a) CO₂ consumption
(b) ATP synthesis
(c) O₂ release
(d) Glucose synthesis
Ans. B

Question. The function of cellular respiration is to
(a) make ATP
(b) make NADPH
(c) get rid of glucose
(d) get rid of carbon dioxide
Ans. A

Question. Each chemical reaction in cellular respiration requires
(a) a molecule of ATP
(b) a molecule of FAD
(c) a molecule of NAD
(d) a specific enzyme
Ans. D

Question. The term anaerobic means
(a) with glucose
(b) with oxygen
(c) without glucose
(d) without oxygen
Ans. D

Question. Which of the following processes makes direct use of oxygen?
(a) Glycolysis
(b) Fermentation
(c) Electron transport chain
(d) Krebs cycle
Ans. C

Question. How many ATP molecules are formed during one turn of Kreb’s cycle?
(a) zero
(b) 1
(c) 2
(d) 3 
Ans. B

Question. Glycolysis is a process found in
(a) only eukaryotic cells
(b) only prokaryotic cells
(c) only most muscle cells
(d) virtually all cells
Ans. D

Question. How many molecules of oxygen gas are used during the Glycolysis of one glucose molecule?
(a) non
(b) 1
(c) 6
(d) 38
Ans. A

Question. Phosphoglyceraldehyde is oxidized during Glycolysis. What happens to the hydrogen atoms that are removed during this oxidation?
(a) They oxidize NAD
(b) They reduce NAD
(c) They are transferred to Pyruvic acid
(d) They are eliminated in the form of methane
Ans. B

Question. During the first step of Glycolysis, glucose is converted to glucose phosphate. The phosphate group comes from
(a) inorganic phosphate
(b) phospholipids of the membrane
(c) ADP
(d) ATP
Ans. D

Question. Which of the following is not true of Glycolysis?
(a) substrate level phosphorylation takes place
(b) the end products are carbon dioxide and water
(c) ATP is formed
(d) ATP is used
Ans. B

Question. Which of the following is not formed during alcohol fermentation?
(a) acetyl coenzyme A
(b) Pyruvic acid
(c) Ethanol
(d) Carbon dioxide
Ans. A

Question. Which of the following is the end product of anaerobic respiration in animals?
(a) ethyl alcohol
(b) lactic acid
(c) carbon dioxide
(d) water
Ans. B

Question. In the conversion of Pyruvic acid to acetyl coenzyme A, Pyruvic acid is:
(a) oxidized (b) reduced
(c) broken into one carbon fragment
(d) isomerized
Ans. A

Question. At the end of the Krebs cycle, most of the energy removed from the glucose molecule has been transferred to:
(a) NADH₂ and FADH₂
(b) ATP
(c) Oxaloacetic acid
(d) Citric acid
Ans. A

Question. In the electron transport system, the final acceptor electrons is
(a) cytochrome c
(b) cytochrome a
(c) oxygen
(d) FAD
Ans. C

Question. In aerobic respiration, most of the ATP is synthesized during
(a) Glycolysis
(b) Oxidation of Pyruvic acid
(c) The Krebs cycle
(d) Electron transport
Ans. D

Question. How may ATP molecules are formed inside mitochondria from the breakdown of one glucose molecule?
(a) 32 ATP
(b) 36 ATP
(c) 38 ATP
(d) 40 ATP
Ans. B

Question. During electron transport, each molecule of FADH2 produces a maximum of
(a) 2 ATP
(b) 3 ATP
(c) 6 ATP
(d) 8 ATP
Ans. A

Question. Fatty acids enter cellular respiration as:
(a) one carbon fragment
(b) two carbon fragments
(c) three carbon fragments
(d) long chain carbon
Ans. B

Question. In a eukaryotic cell, the Krebs cycle and electron transport chain take place
(a) on the rough endoplasmic reticulum
(b) in the cytoplasm
(c) with in the nucleus
(d) within the mitochondria
Ans. D

Question. The main advantage of aerobic respiration over anaerobic respiration is that:
(a) less carbon dioxide is released
(b) more energy is released from each glucose molecule
(c) fats and proteins are not used
(d) more carbon dioxide is released
Ans. B

Question. A molecule of ADP differs form a molecule of ATP in that it has
(a) diamine instead of thymine
(b) fever phosphate groups
(c) more phosphate groups
(d) more energy
Ans. B

Question. Shoot apical meristem cells are distinct from other stem cells because of their
(a) small size
(b) enlarged water vacuole
(c) thick cell wall
(d) triploid nuclei
Ans. A

Question. New leaves are formed from the
(a) shoot apical meristem
(b) vascular cambium
(c) lateral buds
(d) pericycle
Ans. A

Question. Most of a plant’s auxin is produced in its
(a) leaves
(b) lateral buds
(c) shoot apex
(d) root apical meristem
Ans. C

Question. The main effect of auxin is to stimulate
(a) division
(b) enlargement
(c) differentiation
(d) turgor
Ans. B

Question. Cytokinins stimulate cell
(a) division
(b) enlargemen
(c) wall thickening
(d) turgor
Ans. A

Question. When its terminal bud is moved, plant grows more
(a) tall
(b) bushy
(c) slowly
(d) rapidly
Ans. B

Question. Which of the following delays the normal process of aging in leaves?
(a) auxins
(b) gibberellins
(c) insulin
(d) Cytokinins
Ans. D

Question. Ethylene is an unusual hormone in that it is
(a) a gas
(b) solid
(c) transported by the xylem
(d) transported by the phloem
Ans. A

Question. An important effect of ethylene is to cause maturation of
(a) leaf primordial
(b) flower
(c) fruit
(d) stem
Ans. C

Question. If a short day plant is grown under conditions of long nights and short days and the dark period is interrupted in the middle by a brief exposure to red light, the plant will
(a) wilt
(b) flower
(c) fail to flower
(d) die
Ans. C

Question. If a long day plant is grown under conditions of long nights and short days and the dark period is interrupted in the middle by a brief exposure to red light, the plant will
(a) die
(b) flower
(c) fail to flower
(d) wilt
Ans. B

Question. Which of these is not true of fermentation (anaerobic respiration)?
(a) net gain of only 2 ATP
(b) occurs in the cytoplasm
(c) NADH donates electrons to the electron transport system
(d) Beings with glucose
Ans. C

Question. The transfer of high energy phosphate bonds to ADP by the substrate is called:
(a) oxidative phosphorylation
(b) substrate level phosphorylation
(c) photophosphorylation
(d) carboxylation
Ans. B

Question. Which of the above properties are shared by fermentation, aerobic respiration and photosynthesis?
(a) I-II
(b) I-IV
(c) I-III
(d) III-IV
Ans. C

Question. The asexual production of seeds is called
(a) fragmentation
(b) fertilization
(c) parthenocarpy
(d) apomixes (parthenogenesis)
Ans. D

Question. A hormone that controls closure of stomata in response to water stress is
(a) gibberellins
(b) Abscisic acid
(c) Auxins
(d) Cytokinins
Ans. B

Question. Which of the following cellular organelles extracts energy from carbohydrates and forms ATP molecules?
(a) Lysosome
(b) Chloroplast
(c) Mitochondrion
(d) Chromoplast
Ans. C

Question. The value of respiratory quotient of amino acids is
(a) 0
(b) 1
(c) more than 1
(d) less than 1
Ans. C

Question. The primary plant body is covered with a layer of cells called
(a) cuticle
(b) epidermis
(c) periderm
(d) ground tissue
Ans. B

Question. Root hairs are formed from extension of the
(a) ground tissue
(b) periderm
(c) epidermis
(d) cuticle
Ans. C

Question. The function of root cap is to
(a) produce embryonic cells
(b) protect the root apical meristem from damage
(c) absorb water
(d) absorb minerals
Ans. B