The first photosynthetic oxygen liberating organisms to appear on earth were

Related MCQs

• The optimum dissolved oxygen level (in mg/litre) required for survival of aquatic organisms is -
• The pigment involved in photosynthetic activity is -
• Which one of the following is not a photosynthetic pigment?
• Maximum photosynthetic activity occurs in -
• Of all micro-organisms, the most adaptable and versatile are –
• For the aquatic organisms, the source of food is –
• Which of the following organisms is most likely to produce green-house gases such as nitrous oxide and methane?
• Free-living nitrogen fixing micro- organisms are -
• Saprophytes are the organisms which depend for food on –
• Which of the following branches deals with the interactions of same species of living organisms with their nonliving environment?