All types of plastids possess essentially the same structure because they:
Perform the same function
Stored food materials like starch, fat and protein
Occur in aerial parts
Can transform from one form to another
Boron in green plants assists in:
Sugar transport
Activation of enzymes
Acting as enzyme cofactor
Photosynthesis
The first step of photosynthesis is:
Excitation of electron of chlorophyll by a photon of light
Formation of ATP
Attachment of CO2 to 5 carbon sugar
Ionization of water
In the leaves of C4- plants, malic acid formation during CO2 fixation occurs in the cells of:
Mesophyll
Bundle sheath
Phloem
Epidermis
Which of the following can fix atmospheric nitrogen?
Albugo
Cystopus
Saprolegnia
Anabaena
The plant requires magnesium for :
Holding cells together
Protein synthesis
Chlorophyll synthesis
Plant cell wall formation
Protochlorophyll differs from chlorophyll in lacking:
2 hydrogen atoms in one of its pyrrole rings
2 hydrogen atoms in two of its pyrrole rings
4 hydrogen atoms in two of its pyrrole rings
4 hydrogen atoms in one of its pyrrole rings
In photosystem – I the first electron acceptor is:
Cytochrome
Plastocyanin
An iron-sulphur protein
Ferredoxin
The major role of minor elements inside living organisms is to act as:
Binder of cell structure
Co-factors of enzymes
Building blocks of important amino acids
Constituent of hormones
The major portion of the dry weight of plants comprise of:
Carbon, Hydrogen and Oxygen
Nitrogen, Phosphorus and Potassium
Calcium, Magnesium and Sulphur
Carbon, Nitrogen and Hydrogen
