Plant Physiology MCQ: MCQ Test (50 questions)

Question 1 of 50

If the stem grows towards sunlight, and root grow just opposite to it, stem movement is called-

ANegative phototrophic movement
BPhototrophic movement
CPositive phototrophic movement
DNone of these

Question 2 of 50

Water exadation through hydathodes is-

AGuttation
BTranspiration
CHydrolysis
DExcretion

Question 3 of 50

For the growth of plants in length, which of the following is not essential ?

ACalcium
BSodium
CNitrogen
DPhosphorus

Question 4 of 50

Hydathodes occur on-

AStem
BLeaves
CRoot
DAll of these

Question 5 of 50

ATP is -

AAn enzyme which during about oxidation
BHarmone
CA protein
DA molecule which contain high energy phosphate bond

Question 6 of 50

Consider the following plants-n1. Bougainvillea 2. Carnationsn3. Cocoa 4. GrapesnWhich of these plants are propagated by stem cutting ?

A1 & 2
B2, 3 & 4
C1, 3 & 4
D1, 2, 3 & 4

Question 7 of 50

Which of the following gas is absorbed during photosynthesis ?

AN2
BCO2
CO2
DWater vapour

Question 8 of 50

Different steps in respiration are controlled by-

AAuxins
BSugar
CEnzymes
DKinins

Question 9 of 50

Transpiration is high under-

ADry environment
BLow atmospheric pressure
CHigh Temperature
DAll of above.

Question 10 of 50

Plant purify air during-

APhotosynthesis
Brespiration
CTranspiration
DDesiccation

Question 11 of 50

A cell shrink when it is placed in-

AHypertonic solution
BHypotonic solution
CIsotonic solution
DSaturated solution

Question 12 of 50

Fruit drop occurs when fruit has-

ANo auxin as in the stem
BLess auxin as compared to stem
CMore auxin than the one present in the stem
DAuxin concentration equal to that of stem

Question 13 of 50

Incomplete break down of sugar in anaerobic respiration form-

AFructose and water
BGlucose and CO2
CAlcohol and CO2
DWater and CO2

Question 14 of 50

Which of the following statement is/are correct regarding vegetative propagation of plants ?n1. Vegetative propagation produces clonal population.n2. Vegetative propagation helps in eliminating the virus.n3. Vegetative propagation can be practiced most of the year.nSelect the correct answer using the code given below :

A1 only
B2 and 3 only
C1 and 3
D1, 2 and 3

Question 15 of 50

Indol acetic acid is-

AEnzyme
BFungicides
CAmino acid
DAuxin

Question 16 of 50

The percentage of water lost during transpiration is-

A0.8
B0.6
C0.99
D0.4

Question 17 of 50

The instrument by which rate of growth of plant is measured-

AHydrometer
BAuxanometer
COsmometer
DPotometer

Question 18 of 50

Food products are kept in cold storage or refrigeration in order to-

AMake the tasty
BUse in off season
CMaintenance of ffreshness, longevity and teste due to low respiration
DKeep them cool

Question 19 of 50

Food is preserved at low temperature because-

ABacterial attack is minimise
BFor easy cooking
CFor easy digestion
DAll the above

Question 20 of 50

Which one yield the maximum energy ?

AKrebs cycle
BAnaerobic respiration
CGlycolysis
DAerobic respiration

Question 21 of 50

In plant process of transpiration occur through-

AStem
BLeaves
CRoot
DAll the aerial part of plant

Question 22 of 50

End product of aerobic respiration are-

ASugar and oxygen
BCarbon dioxide, water and energy
CWater and energy
DCarbon dioxide and energy

Question 23 of 50

Photoperiodism affects-

AFlowering
BFruiting
CVegetative growth
DAll of these

Question 24 of 50

2-4-D is a-

AInsecteside
BExplosive
CFungicides
DWeedicides

Question 25 of 50

Which one can respire in absence of oxygen ?

ASeeds
BLeaves
CStem
DRoot

Question 26 of 50

Mitochondria are sites of-

AOxidative Phosphorylation
BPhotolysis
CPhosphorylation
DStarch synthesis

Question 27 of 50

An instrument for measuring the rate of transpiration :

APorometer
BHygrometer
CPotometer
DPsychrometer

Question 28 of 50

Maximum transpiration occur in-

AAlgal cells
BXerophytic plants
CHydrophytic plants
DMesophytic plants

Question 29 of 50

IAA was first isolated from-

ACorn germ oil
BGibberella
CHuman urine
DRhizopus

Question 30 of 50

Which equation shows the reaction of photosynthesis ?

ACO2 + H2O — CH2O + O2
B6CO2 + 12H2O — C6H12O6 + 6O2 + 6H2O
C6CO2 + 6H2O — C6H12O6 + 6O2
DC6H12O6 + 6O2 — 6CO2 + 6H2O

Question 31 of 50

Which one of the following statement is false?

APhotosynthesis occur in presence of sunlight
BCO2 is used during photosynthesis
CO2 is used during photosynthesis
DO2 comes out during photosynthesis

Question 32 of 50

First herbicide produced in the world is-

A2, 4-D
B2, 4, 5-T
CPendimethalin
DSemazine

Question 33 of 50

Condition in which rate of transpiration increases-

ALow velocity of wing
BLow Humidity and high temperature
CHigh humidity
DExcess amount of water in soil

Question 34 of 50

A cell placed in strong salt solution will shrink because

ACytoplasm will decompose.
BMineral salt will break the cell wall.
CSalt water enters the cell.
DWater comes out from cell by exosmosis.

Question 35 of 50

Which one of following is a weedicides ?

ANAA
B2, 4-D
CABA
DG.A

Question 36 of 50

Instaneous source of energy is-

AGlucose
BFats
CProteins
DAmino acids

Question 37 of 50

Which of the following structures of a plant responsible for transpiration ?

AXylem
BRoot
CStomata
DBark

Question 38 of 50

In anaerobic respiration-

AOxygen is absorbed
BOxygen is released
CCarbon dioxide is released
DCarbon dioxide is absorbed

Question 39 of 50

Respiration is found in-

AIn all living cell in light
BAll living cell in dark
CIn all living cell both in light and dark
DOnly in non green cells both in light and dark

Question 40 of 50

The process in which water is split during photosynthesis is-

APhotolysis
BHydrolysis
CPlasmolysis
DHemolysis

Question 41 of 50

Photosynthesis proceeds in sequence of -

ADark phase and light phase
BLight phase alone
CLight phase and dark phase
DDark phase alone

Question 42 of 50

Which part of plant helps in holding the plant firmly into the soil ?

ALeaves
BFruit
CStem
DRoots

Question 43 of 50

Which gas is essential for photosynthesis ?

AO2
BCO2
CN2
DCO

Question 44 of 50

Auxin is a-

AGrowth catylser
BGrowth destroyer
CGrowth harmone
DGrowth inhibitor

Question 45 of 50

Anaerobic respiration takes place-

AIn absence of oxygen
BIn presence of oxygen
CIn presence of carbon dioxide
DIn absence of carbon dioxide

Question 46 of 50

In photosynthesis-

ALight energy is converted into chemical energy
BChemical energy is converted into light energy
CChemical energy is converted into electrical energy
DLight energy is converted into mechanical energy

Question 47 of 50

Which one of following statements is correct about harmone ?

AIt is a organic compound which control the growth of plant
BIt is a special kind of organic compound found in small amount which control metabolic activity and growth of plant
CIts different concentration have different effect on different organ
DAll of these

Question 48 of 50

The plant growth regulators are small, simple molecules of diverse chemical composition. They are-

Acarbohydrates, fats and proteins
Bindole compounds, adenine derivatives, carotenoids and terpenes
Cfatty acids, glucose and vitamins
Dvitamin-C, vitamin-D and glucose

Question 49 of 50

Name a biological process in which glucose and fat is oxidised to librate energy-

APhotosynthesis
BRespiration
CTranspiration
DFermentation

Question 50 of 50

When concentration of solutes is low in the soil, absorption of water is-

AStopped
BIncrease
CRetarded
DRemains Normal