The visible light is between _________nm.
400-700
500-600
120-350
none of these
Reduction of carbondioxide to carbohydrates occurs during
digestion
respiration
photosynthesis
excretion
The energy carried by a photon is called __________.
Joule
Watts
Quantum
None
A ____________ is a disc shaped membrane sac present in the granum of chloroplast.
Xylem
Phloem
Thylakoid
Stoma
In order to destarch the leaves for an experiment to show that sunlight is necessary for photosynthesis, the :
leaves are kept in alcohol and boiled in a water bath
leaves are soaked in iodine for two hours
plants with the leaves is kept in dark room for 48 hours
plant with the leaves is exposed to light of a lamp, a night before the experiment
The autotrophic mode of nutrition requires
carbon dioxide and water
chlorophyll
sunlight
all of the above
When plants are kept in darkness, the ________ becomes inactive.
Chlorophyll
Xanthophyll
Mesophyll
None of these
The molecule which is broken down during the light reaction of photosynthesis is
Oxygen
Water
Carbondioxide
Transpiration has been described as a necessary evil because it is inevitable, but potentially harmful. Which of the following are the after-effects of transpiration ?i) Absorption of mineral salts.ii) Regulation of plant temperature.iii) Wilting and injury in plants.iv) Ascent of sap.
i & iv
i,ii & iii
i,ii & iv
All of these
In submerged plants like Hydrilla carbondioxide diffuses directly through
Cuticle
Epidermis
Stomata
