Physiology of Plants MCQs Part X

1) Maximum transpiration occurs from the
a) Dermal tissue
b) Ground tissue of scale leaves
c) Periderm and lenticels
d) Protoderm + procambium

2) Which of the following is used in measuring the rate of transpiration?
a) Bell-jar
b) potometer
c) salt chloride paper
d) leaf experiment

3) The root system in plants is well developed
a) Due to deficiency of auxin
b) Due to deficiency of cytokinins
c) Due to deficiency of minerals
d) For increased absorption of water

4) The primary acceptor during CO2 fixation in C3
plants is

a) Ribulose bisphosphate
b) Glycolate
c) Phosphoenolypyruvate
d) Triosephosphate

5) Kranz type of anatomy is found in

C2 plants


C3 plants


C4 plants


C6 plants

6) CO2 joins the photosynthetic pathway during

a) Light reactions
b) Dark reactions
c) Photosystem I
d) Photosystem II

7) Which one of the following crop plants is a very efficient converter of solar energy and whose net productive value ranges from 2 Kg to 4 Kg/m2 or even higher?
a) Sugarcane
b) Rice
c) Wheat
d) Bajra

8) The carbohydrates synthesized in the leaves are transported through sieve tubes most commonly in the form of
a) Glucose
b) Triose sugar
c) Sucrose
d) Soluble starch

9) Which cells in C4 plants are
prominently loaded with starch?

a) Epidermal cells
b) Mesophyll cells
c) Bundle sheath cells
d) All of these

10) Chlorophyll ‘b’ is present in
a) Photosynthetic prokaryotes
b) Photosynthetic eukaryotes
c) Both prokaryotes and eukaryote
d) C4 plants only

11) Respiration is an
a) Exothermic process
b) Endothermic process
c) Endergonic process
d) Anabolic process

12) Kreb’s cycle begins with
a) Pyruvic acid
b) Hydrochloric acid
c) Corticosteroids
d) Lysine

13) Photorespiration is favoured by

Low light and high O2 

b) Low O2  and high O2

c) Low temperature and high O2 

d) High O2   and low CO2

14) Peroxisomes in plants are associated with
a) Photosynthesis
b) Photorespiration
c) Photoperiodism
d) Phototropism

15) Oxidative phosphorylation is related to the formation of
a) ATP by chloroplasts via photosynthesis
b) ATP by chondriosomes via photolysis
c) ATP by cytoplasm via glycolysis
d) ATP by mitochondria via respiration

16) The first phase in the breakdown of glucose in a cell is
a) Glycolysis
b) Electron transport system
c) Fermentation
d) Krebs cycle

17) Proteins are synthesized on the
a) Mitochondria
b) Centrosome
c) Golgi bodies
d) Ribosomes

18) A free living anaerobic bacterium capable of N2
fixation in soil is

a) Azotobacter
b) Streptococcus
c) Clostridium
d) Rhizobium

19) Amino acids are synthesized from
a) a-keto glutaric acid

b) Mineral acids
c) Fatty acids
d) Volatile acids

20) Which one of the following elements plays an important role in biological nitrogen fixation?
a) Molybdenum
b) Manganese
c) Copper
d) Zinc

21) Which of the following statements is correct?
a) Legumes fix nitrogen only through specialized bacteria that live in their leaves
b) Legumes are independently capable of fixing nitrogen
c) Legumes fix nitrogen only through the specialized bacteria that live in their roots
d) none of the above

22) Lomentum is an
a) Inflorescence
b) Seed
c) Embryo
d) Fruit

23) Pericarp is extended to form a wing in the
a) Achene
b) Samara
c) Cypsela
d) Drupe

24) The edible part of a fig is the
a) Mesocarp
b) Endocarp
c) Receptacle
d) Epicarp and mesocarp

25) Banana is a seedless fruit because the plant is
a) Multiplied aseually
b) Triploid
c) Sprayed with auxin
d) A source of abundant cytokinins

26) The edible part of a grape is the
a) Pericarp and placentae
b) Epicarp and mesocarp
c) Mesocarp
d) Mesocarp, endocarp and placentae

27) A fruit developed from a superior unilocular ovary which dehisces by one suture only is a
a) Follicle
b) Legume
c) Silicula
d) Siliqua

28) The coir of commerce is obtained from
a) Endocarp of Coconut
b) Mesocarp of Coconut
c) Stem of Jute
d) Leaves of Coconut

29) A well developed aril occurs in
a) Inga edulis and Nutmeg
b) Coconut and Groundnut
c) Inga edulis and Cashewnut
d) Cashewnut and Coconut

30) The fruit of Annona squamosa (Custad Apple) is
a) Etaerio of berries
b) Etaerio of drupes
c) Hypanthodium
d) Etaerio of achenes

31) In a certain fruit the pericarp is fused with the testa of the single seed. The fruit is a/an
a) Nut
b) Achene
c) Utricle
d) Caryopsis

32) A fruit containing a leathery glandular epicarp, spongy white mesocarp and locules with subepidermal juicy hair is a
a) Pepo
b) Drupe
c) Pome
d) Hesperidium

33) The bitterness of cucurbits is due to the
a) Alkalinity of pulp
b) Acidity
c) Triterpenes
d) Bitter seeds

34) Which one of the following groups contains fruits belonging to the same category?
a) Cashewnut, Coconut and Chestnut
b) Coconut, Orange and Tomato
c) Betelnut, Chestnut and Coconut
d) Mango, Almond and Coconut

35) The edible part of a guava is the
a) Thalamus and pericarp
b) Entire fruit
c) Endocarp
d) None of the above

36) Which plant will lose its economic value if the fruits are induced through parthenocarpy?
a) Orange
b) Banana
c) Pomegranate
d) Grape

37) A cypsela is a fruit which
a) Develops from a syncarpous, inferior, single seeded ovary
b) Does not have a fruit wall
c) Has a fruit wall fused with the seed coat
d) Has a fleshy pericarp

38) An example of a geocarpic fruit is
a) Mango
b) Orange
c) Water Melon
d) Peanut

39) A single seeded fruit develops from a
a) Tricarpellary ovary
b) Bicarpellary syncarpous ovary
c) Multicarpellary syncarpous ovary
d) Pistil having single ovule

40) Jack Fruit is a multiple fruit formed from a/an
a) Single ripened ovary
b) Inflorescence
c) Flower with many free carpels
d) Flower with many partially fused carpels

41) A dry indehiscent fruit is called a
a) Caryopsis
b) Follicle
c) Capsule
d) Pod

42) Dorsiventral dehiscence occurs in fruits 1 – Legume, 2 – Follicle,3 – Siliqua, 4 – Capsule
a) 1 and 2
b) 2 and 3
c) 2 and 4
d) 1 and 3

43) A fruit that has a fleshy mesocarp and a stony endocarp is a
a) Pome
b) Berry
c) Pepo
d) Drupe

44) The edible part in the fruit of a hesperidium is the
a) Endocarp
b) Mesocarp
c) Juicy hairs
d) Pericarp

45) Epigeal germination occurs in
a) Pea
b) Fram
c) Castor
d) Maize

46) The caruncle develops from the
a) Outer integument
b) Cotyledon
c) Funciculus
d) Inner integument

47) The perisperm is the
a) Remnant of the endosperm
b) Persistent nucellus
c) Peripheral part of the endosperm
d) Disintegrated secondary nucleus

48) The unused nucellus constitutes the
a) Tapetum
b) Tegmen
c) Endosperm
d) Perisperm

49) Ruminate endosperm occurs in
a) Annonaceae/Areca Nut
b) Compositae
c) Cruciferae
d) Euphorbiaceae

50) The tegmen develops from the
a) Funiculus
b) Chalaza
c) Inner integument
d) Outer integument

51) An albuminous seed showing hypogeal germination is
a) Castor
b) Bean
c) Gram
d) maize

52) The coleorhiza is a cap-like covering over the
a) Radicle in dicots
b) Plumule in dicots
c) Plumule in monocots
d) Radicle in monocots

53) 10. During seed germination, the seed coat ruptures due to
a) Differentiation of the cotyledons
b) Massive glycolysis in endosperm and cotyledons
c) Massive imbibition of water
d) Sudden increase in cell division

54) In groundnuts, oil is stored in
a) Embryo axis
b) Endosperm
c) Cotyledons
d) None of the above

55) In a cereal grain, the single cotyledon is represented by the
a) Coleoptile
b) Coleorhiza
c) Scutellum
d) Prophyll

56) Clematis and Naravelia are dispersed by air with the help of the
a) Persistent inflated calyx
b) Persistent hairy style
c) hair
d) Wings

57) The censer mechanism of seed dispersal is found in
a) Papaveraceae
b) Liliaceae
c) Leguminosae
d) Rosaceae

58) A weed belonging to family Asteraceae which has spread to all parts of India is
a) Nicotiana
b) Oryza
c) Parthenium
d) Hordeum

59) The flowers of Asteraceae are
a) Hypogynous
b) Epigynous
c) Perigynous
d) Semi-epigynous

60) A bicarpellary, syncarpous, unilocular ovary with basal placentation occurs in
a) Liliaceae
b) Solanaceae
c) Asteraceae
d) Fabaceae

61) An important feature of Brassicaceae is the
a) Inferior ovary
b) Cruciform corolla
c) Axile swollen placentae
d) Oblique ovary

62) Red Gram is
a) Phaseolus aureus
b) Cicer arietinum
c) Cajanus Cajan
d) Phaseolus mungo

63) Epipetalous stamens with free filaments and fused anthers occur in
a) Asteraceae
b) Solanaceae
c) Liliaceae
d) Poaceae

64) Parietal placentation occurs in the family
a) Brassicaceae
b) Asteraceae
c) Solanaceae
d) Liliaceae

65) Red Pepper is
a) Capsicum annuum
b) Solanum nigrum
c) Lycopersicum esculentum
d) Physalis peruviana

66) The flower of Fabaceae is
a) Complete, zygomorphic, pentamerous
b) Complete, actinomorphic, trimerous
c) Incomplete, zygomorphic, trimerous
d) Incomplete, actionomorphic, pentamerous

67) Identify the family contaning mustard and its main characteristics
a) Brassicaceae – Pentamerous flowers, many stamens, pentacarpellary gynoecium, capsule fruit
b) Solanaceae – Pentamerous flowers, five stamens, bicarpellary gynoecium, berry fruit
c) Brassicaceae – Tetramerous flowers, six stamens, bicarpellary gynoecium, siliqua fruit
d) Poaceae – Trimerous flowers, three stamens, monocarpellary gynoecium, caryopsis fruit

68) Which is not the characteristic feature of Fabaceae?
a) Taproot system, compound leaves, raceme inflorescence
b) Flowers actinomorphic, aestivation twisted and gamopetalous
c) Stamens 10, introrse, basifixed, bithecous
d) Monocarpellary, ovary superior and bent stigma

69) A plant used both as packing materials as well as excellent fodder is
a) Medicago
b) Crotalaria
c) Pongamia
d) All the above

70) In grasses, the ligule occurs on the
a) Sheathing leaf base
b) Leaf blade
c) Petiole
d) Between sheathing leaf base and blade

71) Which is not a feature of Fabaceae
a) Corolla 5, polypetalous, anterior large and outermost
b) Descending imbricate, 10 stamens, diadelphous, ovary superior
c) Sepals 5, gamosopalous, imbricate aestivation, placentation marginal
d) Monocarpellary, ovary superior, style long, slightly bent at the apex

72) Ferula asafoetida yields asafoetida from
a) Leaves
b) Stems
c) Roots
d) Flowers

73) Tunica cells divide
a) Periclinally
b) Anticlinally
c) Both anticlinally and periclinally
d) In all directions

74) The root apex is subterminal because it is
a) Covered by root hairs
b) Covered by root cap
c) Covered by epidermis
d) under the soil

75) Intercalary meristem produces
a) Secondary growth
b) Primary growth
c) Apical growth
d) Secondary thickening

76) Intercalary meristem is found is
a) Mint
b) Grasses
c) Non of the above
d) Both A and B

77) Secondary meristem produces
a) Basal growth
b) Radial growth
c) Transverse growth
d) Vertical growth

78) A eustele is characteristic of
a) Monocots
b) Dicots
c) Pteridophytes
d) Bryophytes

79) A leptocentric or amphivasal vascular bundle has
a) Phloem flanked by xylem on interior and exterior sides only
b) Xylem flanked by phloem on interior and exterior sides only
c) Xylem surrounded by phloem
d) Phloem surrounded compleltely by xylem

80) Rod-shaped elongated thick-walled lignified dead cells found in the seed coat of pulses (legumes) are
a) Macrosclereids
b) Astrosclereids
c) Brachysclereids
d) Osteosclereids

81) A bicollateral vascular bundle is characterised by
a) Phloem being sandwitched between xylem
b) Transverse splitting of vascular bundle
c) Longitudinal splitting of vascular bundle
d) Xylem being sandwitched between phloem

82) Bordered pits occur is
a) Gymnosperms
b) Monocots
c) Dicots
d) all the above

83) The basic difference between a vessel and a tracheid is in the
a) Types of pits
b) Thickeness and lignification
c) Perforations of end walls
d) Function

84) The chief function of phloem is the conduction of
a) Food
b) Minerals
c) Water
d) Air

85) Jute fibres deteriorate quickly because of the
a) High cellulose content
b) High lignin content
c) Low cellulose content
d) Low lignin content

86) The type of sclereids found in the seed coat of pulses are
a) Macrosclereids
b) Brachysclereids
c) Osteosclereids
d) Asterosclereids

87) Which is wrong about sieve tube elements?
a) Peripheral cytoplasm and large vacuolc
b) Perforated end wall becomes impregnated with lignin
c) P-proteins occus evenly distributed throughout lumen
d) Absence of nucleus at maturity

88) Collenchyma is
a) Living with no reserve food
b) Living with protoplasm
c) Dead and hollow
d) Dead with reserve food

89) Chickle/chewing gum was formerly obtained from the latex of
a) Manihot
b) Achras
c) Papaya
d) Yucca

90) Exchange of gases in old stems takes place from
a) Stomata
b) Hydathodes
c) Lenticels
d) Passage cells

91) The oldest layer of secondary phloem in a dicot stem is located just
a) Outside the vascular cambium
b) Inside the vascular cambium
c) Inside the primary phloem
d) Outside the secondary xylem

92) The lateral branches of roots (dicot) generally originate from
a) Cortex
b) Endodermis
c) Cork cambium
d) Pericycle cells lying against protoxylem

93) When secondary growth in thickness is initiated in a dicot root, which of the following happens first?
a) Cambial initials between xylem and phloem divide
b) Pericycle strands outside the primary xylem divide
c) Anticlinal divisions takes place so that the cambium becomes circular
d) Parenchymatous cells between xylem and phloem become meristematic

94) Cork is an excellent material for making bottle stoppers because it is
a) Cheap
b) Easily available
c) Air tight
d) Light

95) Vascular bundles in dicot roots are
a) Radial exarch
b) Conjoint
c) Radial endarch
d) Conjoint exarch

96) The layer of cells between the endodermis and the vascular bundle is known as the
a) Pericycle
b) Cortex
c) Pith
d) Epidermis

97) Tyloses occur in
a) Secondary xylem
b) Secondary phloem
c) Callus tissue
d) Cork cells

98) The largest number of chloroplasts in the leaf is in
a) Spongy tissue
b) Palisade tissue
c) Guard cells
d) Bundle sheath

99) The balloon like growths of parenchyma in the lumen of a vessel are known as
a) Histogen
b) Tyloses
c) Phellogen
d) Tunica

100) Collenchymatous hypodermis is present in
a) Dicot stem
b) Monocot stem
c) Monocot as well as dicot stems
d) None of the above


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