A free living, nitrogen-fixing cyanobacterium which can also form symbiotic association with the water fern Azolla is:
Tolypothrix
Chlorella
Nostoc
Anabaena
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
During photorespiration, the oxygen consuming reaction (s) occur in:
Stroma of chloroplasts and peroxisomes
Grana of chloroplasts and peroxisomes
Stroma of chloroplasts
Stroma of chloroplasts and mitochondria
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
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
The principle of limiting factors was proposed by:
Blackmann
Hill
Arnon
Liebig
Plants adapted to low light intensity have:
Larger photosynthetic unit size than the sun plants
Higher rate of CO2 fixation than the sun plants
More extended root system
Leaves modified to spines
Carbon dioxide joins the photosynthetic pathway in:
PS-I
PS-II
Light reaction
Dark reaction
Choose the correct match:
Bladderwort, Sundew, Venus fly trap
Nepenthes, Dionea, Drosera
Nepenthes, Utricularia, Vanda
Utricularia, Drosera, Dionea
Dionea, Trapa, Vanda
