Rapid and dramatic increase in shoot length is called 

 a) Triple response growth         b) Bolting
 c) scarification                           d) Night break effect

Environment heterophylly is seen in
 a) Cotton    b) Coriander      c) Larkspur         d)    Buttercup

Genetically dwarf plants can be induced to grow tall by using
 a) Gibberellins    b) Phycobillins         c)    Auxins         d)    Cytokinins

Increased growth per unit time is termed as
 a) Nascent growth rate         b)    Growth rate    c) Biomass    d) All of these

Which plant hormone promotes seed dormancy, bud dormancy and causes stomatal closure?
 a) IAA           b) Abscisic acid         c)    GA          d)    cytokinin

Which plant hormone is found in gaseous form?
 a) Auxin    b) Cytokinin      c) Ethylene      d) ABA

Measurement and comparison of total growth in geometrical growth of a plant per unit time is called
 a) Absolute growth rate    b) Qualitative growth rate
 c) Relative growth rate    d) Exponential growth rate

Auxin in plant means for
 a) Cell elongation    b) Fruit ripening
 c) Cell division         d) Inhibition of root growth

Grand place of growth is an another name of
 a) Lag phase                                b) Stationary phase
 c) Diminishing growth phase       d) Exponential growth phase

Which of the following movements in plants is due to the increased concentration of auxin?
 a) Movement of shoot towards the source of light    b) Nyctinasty
 c) Movement of sunflower towards sun                    d) All of the above

Primary growth of plants is contributed by
 a) Root apical meristem    b) Shoot apical meristem
 c) Intercalary meristem    d) All of these

Which one is an example of redifferentiation?
 a) Cork cambium      b) Secondary cortex
 c) Meristems            d) Interfasicular cambium

Which hormone is called the dormancy hormone?
 a) IAA                              b) NAA                   c) ABA                       d) GA

Plant growth regulators are also described as
 a) Plant growth substance    b) Plant hormones
 c) Phytohormones                d) All of these

Name of a gaseous plant hormone is
 a) IAA         b)    Gibberellins         c)    Ethylene    d) Abscisic acid

Exponential growth can’t be sustained for much time due to
I. limited space and nutrient
II. accumulation of toxic agent
III. unlimited space and nutrient
IV. accumulation of nutrient agent
Choose the correct combination of options
 a) I and III        b) III and IV    c) I and II    d) IV and II

Programmed cell death is scientifically termed as
 a) Autotomy    b) Cell lysis         c)    Apoptosis    d) None of these

The following statements are given about plant growth hormones:
I.    Kinetin is a degradative substance from DNA molecule.
II.    ABA is present, in all the plants.
III.    Low ratio of cytokinins to auxins favours root formation only.
IV.    ABA is synthesized catabolically through mevalonate pathway.
The correct combination is
 a) I and II          b) II and III         c)    I and III       d) III and IV

Ethephon
 a) Hasten fruit ripening in tomatoes        b) Accelerate abscission
 c) Promote female flower cucumbers      d) All of the above

The chemical nature of gibberellins is
 a) Acidic    b) Alkaline    c) Proteinaceous      d) Amines

Which hormone was first isolated from human urine?
 a) Auxin                 b) ABA                    c)    Ethylene                      d) Gibberellic acid

Which phytohormone has viral inhibitory property?
 a) IAA                          b)    GA_3                      c) ABA                d) 2,4-D

Which of the following is the effect of a plant hormone, which is synthesized more in the absence of light?
 a) Inhibits the development of seedless fruits    b) Responsible for closing of stomata
 c) Induces the dormancy of seeds                    d) Length of internodes increases

Shock movement in ‘touch me not’ plant is
 a) Seismonasty            b) Photonasty          c) Chemonasty          d) Thermonasty

Vernalisation helps in
 a) Shortening of reproductive phase    b) Shortening of juvenile phase
 c) Shortening of vegetative phase        d) Both (a) and (c)

Hormone replacing the requirement of vernalization is
 a) ethylene         b) auxin          c) gibberellins               d)    cytokinin

Photoperiod was first observed in
 a) Potato            b) Maryland mammoth                             c) Four O’clock                  d)    Evening primrose

Decapitation (shoot tip removal) is widely used in
 a) Blotting           b) Hedge making          c) Tea plantation         d) Both (b) and (c)

Phototropic curvature is the result of uneen Distribution of
 a) Gibberellin               b) Phytochrome               c) Cytokinins              d) Auxin

In photoactive plants, during day time the following ionic flux of guard cell is directly involves the expenditure of energy.
 a) Outward movement of malate                          b)    Inward movement of potassium ions
 c) Outward movement of protons                         d)    Inward movement of chloride

Which one of the following statement is incorrect?
 a) Apparent growth is an irreversible increase in mass or volume
 b) Real growth is the formation of new protoplasm
 c) Growth in plants is open ended
 d) Growth in plants is closed ended

 Surface area of roots by promoting roots growth and root hair formation is increased by
 a) Cytokinin                    b) Kinetin                     c) Ethylene                   d)    ABA

Quantitative comparison between the growth of living system can be made in
 a) Two ways      b) Three ways         c)    One ways    d) Four ways

Gibberellins promotes cell division and elongation in
 a) Leaves              b) Roots             c) Shoots            d) All of these

The shedding of leaves, flowers or fruits due to change in the hormonal balance in plants, is referred as
a) Senescence           b) Ascission             c) Photoperiodism          d) vernalization