Plant Physiology MCQs | Plant Physiology Short Questions and Answers

Questions
41 Translocation of carbohydrate nutrients usually occurs in the form of
A glucose
B maltose
C starch
D sucrose

Answer: sucrose
42 Maximum solar energy is trapped by
A planting trees
B cultivating crops
C growing algae in tanks
D growing grasses

Answer: growing algae in tanks
43 Stomata open and close due to
A circadian rhythm
B genetic clock
C pressure of gases inside the leaves
D turgor pressure of guard cells

Answer: turgor pressure of guard cells
44 Phytochrome is involved in
A phototropism
B photorespiration
C photoperiodism
D geotropism

Answer: photoperiodism
45 Minerals absorbed by root move to the leaf through
A xylem
B phloem
C sieve tubes
D none of the above

Answer: xylem
46 The size of chlorophyll molecule is
A head 15 x 15 A, tail 25 A
B head 20 x 20 A, tail 25 A
C head 15 x 15 A, tail 20 A
D head 10 x 12 A, tail 25 A

Answer: head 15 x 15 A, tail 20 A
47 The substrate for photorespiration is
A phosphoglyceric acid
B glycolate
C serine
D glycine

Answer: glycolate
48 In C4 plants, Calvin cycle operates in
A stroma of bundle sheath chloroplasts
B grana of bundle sheath chloroplasts
C grana of mesophyll chloroplasts
D stroma of mesophyll chloroplasts

Answer: stroma of bundle sheath chloroplasts
49 Greatest producers of organic matter are
A crop plants
B forests
C plants of the land area
D phytoplankton of oceans

Answer: phytoplankton of oceans
50 A very efficient converter of solar energy with net productivity of 204 kg/m2 or more is the crop
A wheat
B sugarcane
C rice
D bajra

Answer: sugarcane
51 A bottle filled with previously moistened mustard seeds and water was screw capped tightly and kept in a corner. It blew up suddenly after about half an hour. The phenomenon involved is
A diffusion
B imbibition
C osmosis
D D.P.D.

Answer: imbibition
52 The principal pathway of water translocation in angiosperms is
A sieve cells
B sieve tube elements
C xylem vessel system
D xylem and phloem

Answer: xylem vessel system
53 Which of the following movement is not related to auxin level?
A bending of shoot towards light
B movement of root towards soil
C nyctinastic leaf movements
D movement of sunflower head tracking the sun

Answer: nyctinastic leaf movements
54 Phototropic and geotropic movements are linked to
A gibberellins
B enzymes
C auxin
D cytokinins

Answer: auxin
55 Abscisic acid controls
A cell division
B leaf fall and dormancy
C shoot elongation
D cell elongation and wall formation

Answer: leaf fall and dormancy
56 Phytohormones are
A chemical regulation flowering
B chemical regulation secondary growth
C hormones regulating growth from seed to adulthood
D regulators synthesised by plants and influencing physiological processes

Answer: regulators synthesised by plants and influencing physiological processes
57 Highest auxin concentration occurs
A in growing tips
B in leaves
C at base of plant organs
D in xylem and phloem

Answer: in growing tips
58 Kranz anatomy is typical of
A C4 plants
B C3 plants
C C2 plants
D CAM plants

Answer: C4 plants
59 Which one is a C4-plant?
A papaya
B pea
C potato
D maize/corn

Answer: maize/corn
60 The first carbon dioxide acceptor in C4-plants is
A phosphoenol-pyruvate
B ribulose 1, 5-diphosphate
C oxalo-acetic acid
D phosphoglyceric acid

Answer: phosphoenol-pyruvate
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