Plant Physiology

Opening and closing of stomata takes place due to changes in

• turgor pressure of guard cells

• plasmolysis of cells

• flaccidity of guard cells

• wall thickness in guard

Transpiration occurs mainly through

• flower bud

• epidermis

• cuticle

• stomata

Guttation is mainly due to

• transpiration

• imbibition

• osmosis

• root pressure

Which one of the following is the anti-transpirant

• Succinic acid

• Phenyl Mercuric Acetate

• Acetic acid

• Indole Acetic Acid

Name the epidermal cells that surrounds the guard cells of the stoma

• mesophyll cells

• subsidiary cells

• spongy cells

• velamen tissue

Water has the highest latent heat of vapourization with 44KJ mol^-1 at 25C

• True

• False

------------------is an blue green algae that helps in Nitrogen fixation.

• Anabena

• Rhizobium

• Azolla

• Azotobacter

Formation of fruits without pollination and fertilization is called---------------------.

The programmed aging process leading to death of an organ or plant is called as ---------------------.

• senescence

• maturation

• morphogenesis

• cell death

-----------------is an ripening hormone.

• Auxin

• Giberellin    

• Cytokinin    

• Ethylene