The opening and closing of stomata is controlled by:
  • Guard cells
  • Xylem
  • Chloroplast
  • Phloem
The stomatal pore opens when:
  • Guard cells shrink
  • Chloroplast of guard cells swell up
  • Guard cells swell up
  • Chloroplast of guard cells shrink
During photosynthesis, light energy from the sun is absorbed by:
  • Mitochondria
  • Guard cell
  • Chlorophyll
  • Stomata
Which of the following is the correct reaction of photosynthesis?
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  • A
  • B
  • C
  • D
A minute pore which helps in exchange of gases is:
  • Stomata
  • Matrix
  • Thylakoid
  • Guard cell
When leaf of a normal plant is boiled in the ethanol and treated with iodine its color changes to:
  • Pink
  • Blue black
  • Black
  • Orange
Suppose you are performing the starch iodine-test to study photosynthesis. What will be the correct sequence of the following steps:i) Boiling leaf in alcohol. ii) Dipping leaf in iodine solution iii) Boiling leaf in water iv) Rinsing leaf with water
  • ii,iii,iv,i
  • iv, ii, ii, i
  • iii,i,iv,ii
  • i,ii,iii,iv
Which structure is used for gaseous exchange and loss of water in plants?
  • Stomata correct
  • Leaves
  • Roots
  • Buds
To make the plant free of starch, it is:
  • Kept in darkness for 72 hours
  • Kept in a room, but with lights on at night only
  • Kept covered with coloured polythene in a shady place
  • Kept under the shade of tree
To remove chlorophyll, the leaf is boiled into:
  • Water
  • Alcohol
  • Iodine solution
  • None of these
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