Plant Physiology - Mixed Extras Flashcards by Simrah Mahmood

If OP=TP , then cell will be FULLY -

Turgid

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What will be the effect on open stomata when , if relative humidity is 100% in atm?

Completely open

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Transpiration is completely absent in -

Submerged hydrophytes

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Xylem is associated with the translocation of ORGANIC NITROGEN .T/F

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Osmosis is the movement of ____ from their lower conc to higher conc .

Solution

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Root pressure develops to -

Active absorption

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A column of water within xylem vessels of tall trees does not break under its weight because of -

Tensile strength of water

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Which conditions favour guttation -

High water absorption

Low transpiration

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Root pressure is maximum when -

Transpiration is low

Absorption is high

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Due to increasing temperature, transpiration -

First inc then dec

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If temperature is constant , then with increasing altitude , transpiration will -

Increase

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Due to wind velocity , the transpiration rate will be -

First inc then dec

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The most imp function of transpiration -

Cooling the plants

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Most imp factor affecting transpiration-

Humidity

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Which kind of transpiration is more common -

Stomatal

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Conversion of starch to organic acid is essential for stomatal opening /closure ?

Opening

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Inc in CO2 around leaf results in ____ of stomata .

Partial closure

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% of water absorbed by herbaceous plants is lost in transpiration is -

99%

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Conduction of water from root hair to root xylem is -

Apoplastic+symplastic

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Dixon and jolly are associated with -

Cohesion and transpiration pull theory of ascent of sap

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Water potential of a cell when it is placed HYPERTONIC solution -

Decreases

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Best condition by which fully turgid cell can be identified is -

TP=OP

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Direction of movement of water is from :
___OP - _____ OP
___DPD-____DPD
____DP-___DP

Low high
Low high
High low

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Water from soil enters into root hairs on account of -

Suction pressure or DPD

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Suctions pressure =

DPD

___ of NaCl solution will be HIGHER than ____ of sugar solution .

DPD

Water enters into root hair from soil because the osmotic pressure of SOIL -

Remains lesser Than that of root hair sap

One molar solution of which substance will have max OP-

Glucose

_______ uptake of minerals depends on DEPHOSPHORYLATION .

Active

Little leaf disease is cased by -

Which mineral is essential for N2 metabolism ?

The most abundant element present in plants -

C | note- the most abundant element present in any living organism is C

Gray spots of oats are caused due to deficiency of -

The major portion of dry weight of plants comprises of -

C , H , O2

About 98% of the mass of every living organism is composed of just 6 elements - name them - (aipmt)

C , H , N , O2 , Ca , P

Mn is req in -(aipmt )

Photolysis of H2O during photosynthesis

The common N2 fixer in paddy fields is -(aipmt)

Oscillatoria

A prokaryotic autotrophic N2 fixing symbionts is found in -(aipmt)

Cycas

Name 2 free-living ans symbiotic N2 fixers -(aipmt)

Azotobacter | Rhizobium

What is nitrate assimilation?

Reduction of NO3-

Anaerobic N2 fixing organisms -

Clostridium Rhodospirillum Rhodoseudomonas

Passive absorption of ions usually occurs through -

Ion channels

Denitrification results in _______ in N2 content in soil .

Dec

Any mineral ion conc in tissues that reduces the dry weight of tissues by about 10% is considered - critical conc / toxic conc. ?

Toxic conc

Mineral absorption is mostly ______.

Active

Premature fall of leaves and buds is a mineral deficiency symptom occurring in the region where soil is deficient in -

During photosynthesis , o2 in glucose comes from -

CO2

The path of co2 in te dark was successfully traced by the use of which isotope -

O18

Wavelength of light responsible for EMERSON’S enhancement effect -

Both above 680nm and below 680nm

PS1 occurs in -

STROMA thylakoids and non-Appressed parts of grana thylakoids

PS2 occurs in -

Appressed parts of grana thylakoids

Formula of chloro a -

C55 H72 O5 N4 Mg

Which colour of light gives max absorption peak by chloro a -

Blue light

Number of pigment molecules in quantosome -

250 - 400

ADP + iP = ATP in grana is called -

Photophosphorylation

At the time of splitting of H2O , which initially captures the e-?

Chlorophyll

The 1st e- carrier for an e- excited from P700 -

FeS protein / Ferridoxin

C4 plants are found among dicots or monocots ?

Both

C4 plants are adapted to -

Hot and dry climate

Bundle sheath cells of C4 are -

Large and Agranal

What was used durin discover of Calvin cycle ?

Chlorella

Solarisation is -

Destruction of chlorophyll

As compared to c3 plants , how many additional ATPs are needed for net production of 1 molecule of hexose sugar by C4 plans ?

Etiolated plants are formed due to lack of -

Light

C2 cycle is also called -

Glycolate cycle

In C3 plants , the 1st stable product of photosynthesis during dark rxn is -

3-phosphoglyceric acid

Maize is a c3 plant . T/F

F | It s a C4 plant

In PS1 , the 1st e- acceptor is - (aipmt)

An Fe-S protein | Ferridoxin

During photorespiration ,the O2 consuming rxns occur in -

STROMA of chloroplast and peroxisomes | Not in mito

The C4 plants are photosynthecially more efficient than C3 plants becoz -(aipmt)

They have more chloroplasts

Chromatophores take part in -

Photosynthesis

A plant in your garden AVOIDS PHOTORESPIRATORY LOSSES ,has improved water us efficiency , shows high rates of photosynthesis at high temp and has improved efficiency of N2 utilisation ? (aipmt) Is it c3, C4 or CAM ?

Why C4 plants are more efficient ? (aipmt)

They have a mechanism of conc CO2 at the place of RubisCo enzyme action

O2 is not produced during photosynthesis by -

Green S bacteria

C3 pants have been used as greenhouse crops for higher yields becoz -

Current availability of co2 is limiting to c3 plants

Photosynthetic photosystem consist of -

Both LHC and rxn centre

How much energy in terms of ATP equivalents is consumed in the photosynthetic production of a mole of hexose -

54 ATP

Presence of what (2 things) specifies that z-scheme is found not in grana lamella -

PS2 | NADP reductase

In CAM plants , photophosphorylation occurs ___ during ___.

MESOPHYLL cells | Day time

How many quanta of light are req per NADPH + H+ formation ?

4 quanta

The number of ATP and NADPH req per CO2 in the 3 steps of Calvin cycle individually -

Carboxylation - 0 atp 0 nadph Reduction -2 atp 2 nadph Regeneration - 1 atp 0 nadph

LHC are made of ____ pigment molecules bound to proteins .

Hundreds (250- 400 )