PLANT PHYSIOLOGY

 

PLANT PHYSIOLOGY

1. The water potential of pure water is

a. Less than zero

b. More than zero but less than one

c. More than one

d. Zero

 

2. Transpiration and root pressure cause water to rise in plants by

a. pulling it upward

b. pulling and pushing it, respectively

c. pushing it upward

d. pushing and pulling it, respectively

 

3. Movement of ions or molecules in a direction opposite to that of prevailing electro-chemical gradient is known as

a. Active transport

b. Pinocytosis

c. Brownian movement

d. Diffusion

 

4. Correct sequence of events in wilting?

a. Exosmosis-deplasmolysis-temporary and permanent wilting

b. Exosmosis-plasmolysis-temporary and permanent wilting

c. Endosmosis-plasmolysis-temporary and permanent wilting

d. Endosmosis-deplasmolysis - temporary and permanent wilting

e. Exosmosis-deplasmolysis-plasmolysis - temporary and permanent wilting

 

5. What will be the direction of net osmotic movement of water if a solution 'A',

enclosed in a semi permeable membrane, having an osmotic potential of '- 30' bars and turgor pressure of '5' bars is submerged in a solution 'B' with an osmotic potential of '- 10' bars and '0' turgor pressure ?

a. Equal movement in both directions

b. 'B' to 'A'

c. No movement

d. 'A' to 'B'

 

6. The pressure exerted by a swollen vacuole on the cell wall is

a. OP

b. WP

c. TP

d. DPD

 

7. Who said that ‘transpiration is a necessary evil’?

a. Curtis

b. Steward

c. Anderson

d. J.C.Bose

 

8. Which one gives the most valid and recent explanation for stomatal movements?

a. Transpiration

b. Potassium influx and efflux

c. Starch hydrolysis

d. Guard cell photosynthesis

 

9. Carrier proteins are involved in

a. Active transport of ions

b. Passive transport of ions

c. Water transport

d. Water evaporation

 

10. Active transport of ions in the cell requires

a. High temperature

b. ATP

c. Alkaline pH

d. Salts

 

11. Guttated liquid is

a. Pure water

b. Water plus minerals

c. Water plus enzymes

d. All of these

 

12. Stomata of a plant open due to

a. Influx of potassium ions

b. Efflux of potassium ions

c. Influx of hydrogen ions

d. Influx of calcium ions

 

13. Potometer works on the principle of

a. Osmotic pressure

b. Amount of water absorbed equals the amount transpired

c. Potential difference between the tip of the tube and then of the plant

d. Root pressure

 

14. Most suitable theory for ascent of sap is

a. Transpirational pull and cohesion theory of Dixon and Jolly

b. Pulsation theory of J.C. Bose

c. Relay pump theory of Godlewski

d. None of these

 

15. If a cell kept in a solution of unknown concentration gets deplasmolysed, the

solution is

a. Detonic

b. Hypertonic

c. Isotonic

d. Hypotonic

 

16. Which is essential for the growth of root tip ?

a. Zn

b. Fe

c. Ca

d. Mn

 

17. On the basis of symptoms of chlorosis in leaves, a student inferred that this was due to deficiency of nitrogen. The inference could be correct only if we assume that yellowing of leaves appeared first in

a. old leaves

b. young leaves

c. young leaves followed by mature leaves

d. mature leaves followed by young leaves.

 

18. Cytochrome oxidase contains

a. Iron

b. Magnesium

c. Zinc

d. Copper

 

19. Which is correct to saprophytic angiosperms?

a. They secrete enzyme outside the body and absorb

b. They have mycorrhizae fungi

c. They take food and then digest it

d. They are photosynthetic

 

20. The ability of the venus fly trap to capture insects is due to

a. chemical stimulation by the prey

b. a passive process requiring no special ability on the part of the plant.

c. Specialized muscle like cells

d. rapid turgor pressure changes

 

21. Boron in green plants assists in

a. photosynthesis

b. Sugar transport

c. activation of enzyme

d. acting as enzyme cofactor

 

22. Which of the following elements is very essential for the uptake of Ca2+ and membrane function?

a. phosphorus

b. molybdenum

c. manganese

d. boron

 

23. Sulphur is not a constituent of

a. cysteine

b. methionine

c. ferredoxin

d. pyridoxine

 

24. Deficiency symptoms of nitrogen and potassium are visible first in _____

a. senescent leaves

b. young leaves

c. roots

d. buds

 

25. The first stable product of fixation of atmospheric nitrogen in leguminous plants is _____

a. NO-3

b. glutamate

c. NO-2

d. ammonia

 

26. C4 plants are more efficient in photosynthesis than C3 plants due to

a. presence of thin cuticle

b. lower rate of photorespiration

c. higher leaf area

d. presence of larger number of chloroplast in the leaf cells.

 

27. Chlorophyll b is

a. C54H70 O6 N4 Mg

b. C55H70 O6 N4 Mg

c. C55H72 O5 N4 Mg

d. C45H72 O5 N4 Mg

28. Synthesis of ADP + Pi 􀁯 ATP in grana is

a. phosphorylation

b. photophosphorylation

c. oxidative phosphorylation

d. photolysis

 

29. In chloroplast, chlorophyll is present in the

a. stroma

b. outer membrane

c. inner membrane

d. thylakoids

 

30. Electrons from the excited chlorophyll molecule of photosystem II are accepted first by

a. quinone

b. ferredoxin

c. cytochrome-b

d. cytochrome-f

 

31. Read the following four statements A,B,C and D. Select the right option

A. Z scheme of light reaction takes place in the presence of PS I only

B. only PS I is functional in cyclic photophosphorylation

C. cyclic photophosphorylation results into synthesis of ATP and NADPH2

D. stroma lamellae lack PS II as well as NADP

a. A and B

b. B and C

c. C and D

d. B and D

 

32. Photolysis of each water molecule in light reaction will yield ___

a. 2 electrons and 4 protons

b. 4 electrons and 4 protons

c. 4 electrons and 3 protons

d. 2 electrons and 2 protons

 

33. Photosynthetic active radiation (PAR) has the following range of wavelength

a. 400-700 nm

b. 450-920 nm

c. 340-450 nm

d. 500-600 nm

 

34. Phosphoenol pyruvate (PEP) is the primary CO2 acceptor in __

a. C3 plants

b. C4 plants

c. C2 plants

d. C3 and C4 plants

 

35. With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct?

a light saturation for CO2 fixation occurs at 10 % of full sunlight

b. increasing atmospheric CO2 concentration up to 0.05% can enhance CO2 fixation rate

c. C3 plants respond to higher temperature with enhanced photosynthesis while C4 plants have much lower temperature optimum.

d. tomato is a greenhouse crop which can be grown in CO2 enriched atmosphere

for higher yield

 

36. A plant in your garden avoids photorespiratory losses, has improved water use efficiency, shows high rates of photosynthesis at high temperatures and has

improved efficiency of nitrogen utilization. In which of the following physiological

groups would you assign this plant?

a. C4

b. CAM

c. Nitrogen fixer

d. C3

 

37. Emerson's enhancement effect and Red drop have been instrumental in the

discovery of

a. two photosystems operating simultaneously

b. photophosphorylation and cyclic electron transport

c. oxidative phosphorylation

d. photophosphorylation and non-cyclic electron transport

 

38. The process which makes major difference between C3 and C4 plants is

a. glycolysis

b. calvin cycle

c. photorespiration

d. respiration

 

39. In a chloroplast the highest number of protons are found in

a. lumen of thylakoids

b. inter membrane space

c. antennae complex

d. stroma

 

40. Oxidative phosphorylation is

a. formation of ATP by transfer of phosphate group from a substrate to ADP

b. oxidation of phosphate group in ATP

c. Aaddition of phosphate group to ATP

d. formation of ATP by energy released from electrons during substrate

oxidation.

41. Which of the biomolecules is common to respiration-mediated breakdown of fats, carbohydrates and proteins

a. glucose-6-phosphate

b. fructose1,6-bisphosphate

c. pyruvic acid

d. acetyl CoA

 

42 Which statement is wrong for Krebs cycle?

a. there is one point in the cycle where FAD is reduced to FADH2

b. during conversion of succinyl CoA to succinic acid, a molecule of GTP is synthesised.

c. the cycle starts with condensation of acetyl group a.cetyl CoA. with pyruvic acid to yield citric acid

d. there are three points in the cycle where NAD+ is reduced to NADH+H+

 

43. The three boxes in this diagram represents the three major biosynthetic pathways in aerobic respiration and arrows represent net reacts or products. Arrows numbered 4, 8 and 12 can be

a. ATP

b. H2O

c. FAD or FADH2

d. NADH

 

44. The energy released metabolic process in which substrate is oxidised without an external electron acceptor is called

a. glycolysis

b. fermentation

c. aerobic respiration

d. photorespiration

45. Krebs cycle starts with the formation of six carbon compound by a reaction between

a. malic acid and acetyl coenzyme

b. oxaloacetic acid and acetyl coenzyme

c. succinic acid and pyruvic acid

d. fumaric acid and pyruvic acid

 

46. Respiration is a process in which

a. energy is used up

b. energy is stored in the form of ADP

c. energy is released and stored in the form of ATP

d. energy is not released at all

 

47. The common phase between aerobic and anaerobic respiration is called

a. glycolysis

b. krebs cycle

c. tricarboxylic acid cycle

d. oxidative phosphorylation

 

48. ATP synthesis occurs on/in the

a. matrix

b. outer membrane of mitochondrion

c. innermembrane of mitochondrion

d. none of the above

 

49. Which 5-carbon organic acid of the Krebs cycle is a key compound in the N2

metabolism of a cell

a. citric acid

b. fumaric acid

c. oxalosuccinic acid

d. α-Ketoglutaric acid

 

50. Which one of the following acts as a hormone involved in ripening of fruits

a. naphthalene acetic acid

b. ethylene

c. indole acetic acid

d. zeatin

 

51. Coconut milk factor is

a. auxin

b. gibberellin

c. abscisic acid

d. cytokinin

 

52. Banana is seedless because

a. it produces asexually

b. auxin is sprayed

c. both A and B

d. none of the above

 

53. Pruning of plants promotes branching due to sensation of axillary buds by

a. Ethylene

b. Gibberellin

c. IAA

d. Cytokinin

 

54 Avena curvature test is bioassay for activity of

a. Auxin

b. Ethylene

c.Cytokinin

d. Gibberellin

 

55. One of the synthetic auxin is

a. IBA

b. NAA

c. IAA

d. GA

 

56 Which one of the following acids is derivative of carotenoids

a. Abscisic acid

b. Indole butyric acid

c. Indole – 3 acetic

d. Gibberellic acid

 

57. Photoperiodism was first characterized in

a. Cotton

b. Tobacco

c. Potato

d. Tomato

 

58. One of the commonly used plant growth hormone in tea plantations is

a. Abscisic acid

b. Zeatin

c. Indole – 3 – acetic acid

d. Ethylene

 

59. Root development is promoted by

a. Auxin

b. Gibberellin

c. Ethylene

d. Abscisic acid

 

60. Senscence as an active developmental cellular process in the growth and functioning of a flowering plant is indicated in

a. Annual plants

b. Floral plants

c. Vessels and Tracheid differentiation

d. Leaf abscission

 

61. You are given a tissue with its potential for differentiation in an artificial culture. Which of the following pairs of hormones would you add to the medium to secure shoots as well as roots?

a. Gibberellin and abscissic acid

b. IAA and gibberellins

c. Auxin and cytokinin

d. Auxin and abscisic acid

 

62. Phytochrome is a

a. Chromo protein

b. Flavo protein

c. Glyco protein

d. Lipo protein

 

63. Typical growth curve in plants is

a. Linear

b. Stair – steps shaped

c. Parabolic

d. Sigmoid