Mistake Deck Flashcards
Root pressure develops due to:
a. passive absorption
b. active absorption
c. increase in transpiration
d. low osmotic potential in soil
b. active absorption
In soil, water available for plants is:
a. gravitational water
b. chemically bound water
c. capillary water
d. hygroscopic water
c. capillary water
Equation for DPD is:
DPD = OP - TP
Water movement between cells is due to:
a. Turgor pressure
b. Water potential
c. Diffusion pressure deficit
d. incipient plasmolysis
c. Diffusion pressure deficit
Stomatal opening is not affected by:
a. temperature
b. light
c. O2 concentration
d. CO2 concentration
c. O2 concentration
A column of water within xylem vessels of tall trees doesn’t break under its weight because of:
a. lignification of xylem vessels
b. positive root pressure
c. dissolved sugars in water
d. tensile strength of water
d. tensile strength of water
Which one gives the most valid and recent explanation for stomatal movement?
a. starch hydrolysis
b. guard cell photosynthesis
c. transpiration
d. potassium influx and efflux
d. potassium influx and efflux
In land plants, the guard cells differ from other epidermal cells in having:
a. cytoskeleton
b. mitochondria
c. endoplasmic reticulum
d. chloroplasts
d. chloroplasts
Stomata of plant open due to:
a. influx of potassium ions
b. efflux of potassium ions
c. influx of hydrogen ions
d. influx of calcium ions
a. influx of potassium ions
Glycolate induces opening of stomata in
a. presence of oxygen
b. low CO2 concentration
c. high CO2
d. CO2 is absent
b. low CO2 concentration
In guard cells, when sugar is converted into starch, the stomatal pore:
a. closes completely
b. opens partially
c. opens fully
d. remains unchanged
a. closes completely
Conversion of starch to organic acids is required for:
a. stomatal opening
b. stomatal closing
c. stomatal formation
d. stomatal activity
a. stomatal opening
In terrestrial habitats, temperature and rainfall conditions are influenced by:
a. water transformations
b. transpiration
c. thermoperiodism
d. translocation
b. transpiration
_______________ instrument is used to determine the rate of transpiration in plants
Potometer
Most widely accepted theory for ascent of sap in trees is:
a. capillarity
b. role of atmospheric pressure
c. pulsating action of living cell
d. transpiration pull and cohesion theory of Dixon and Jolly
d. transpiration pull and cohesion theory of Dixon and Jolly
Phenyl mercuric acetate results in:
a. reduced photosynthesis
b. reduced transpiration
c. reduced respiration
d. killing plants
b. reduced transpiration
Transpiration is least in:
a. good soil moisture
b. high wind velocity
c. dry environment
d. high atmospheric humidity
d. high atmospheric humidity
When water enters in roots due to diffusion, is termed as:
a. osmosis
b. passive absorption
c. endocytosis
d. active absorption
b. passive absorption
A few drops of sap were collected by cutting across a plant stem. The sap was tested chemically. Which of the following test results indicates that it is phloem sap?
a. acidic
b. alkaline
c. low refractive index
d. absence of sugar
b. alkaline
Translocation of organic solutes in sieve tube members is supported by:
a. cytoplasmic streaming
b. root pressure and transpiration pull
c. P-proteins
d. mass flow involving a carrier and ATP
a. cytoplasmic streaming
Death of protoplasm is pre-requisite for a vital function like:
a. transport of sap
b. transport of food
c. absorption of water
d. gaseous exchange
a. transport of sap
Which is essential for the growth of root tip?
Zn, Ca, Fe, Mn
Ca
A few normal seedlings of tomato were kept in a dark room. After a few days, they were found to have become white-coloured like albinos. Which of the following terms will you use to describe them?
Mutated - Embolised - Etiolated - Defoliated
Etiolated
Sulphur is an important nutrient for optimum growth and productivity in ____________ crops
oilseed