Question

Match column I with column II and select the correct option from the given codes.

Column I	Column II
A. Gross primary productivity	(i) Green plants
B. Secondary productivity	(ii) Rate of synthesis of organic matter by consumers
C. Transducers	(iii) Total organic matter produced from solar energy
D. Food web	(iv) Interconnection of food chains

• A. A-(i), B-(ii), C-(iii), D-(iv)
• B. A-(iii), B-(ii), C-(i), D-(iv)
• C. A-(iii), B-(iv), C-(i), D-(ii)
• D. A-(ii), B-(i), C-(iv), D-(iii)

Answer 1

Answer: (B)

A-(iii), B-(ii), C-(i), D-(iv)

Column I	Column II
A. Gross primary productivity	Gross primary productivity, or GPP, is the rate at which solar energy is captured in sugar molecules during photosynthesis (energy captured per unit area per unit time). Producers such as plants use some of this energy for metabolism/cellular respiration and some for growth (building tissues). So the correct option is 'total organic matter produced from solar energy'.
B. Secondary productivity	Secondary productivity The rate of biomass formation or energy fixation by heterotrophic organisms, such as grazers and decomposers (see heterotrophic nutrition). These derive all their energy from photosynthetic plants and other autotrophs, either directly or indirectly, and their productivity determines the number of trophic levels and the lengths of the food chains within an ecosystem – both of which are likely to be increased by greater secondary productivity. So the correct option is 'rate of synthesis of organic matter by consumers'.
C. Transducers	Transducers are the one who converts one form of energy into another form of energy. Energy types can be electrical, mechanical, electromagnetic (including light), chemical, acoustic, and thermal energy. plants receive light energy and convert it into chemical energy that viruses and animals use. So the correct option is 'green plants'.
D. Food web	A food web (or food cycle) is a natural interconnection of food chains and a graphical representation (usually an image) of what-eats-what in an ecological community. Another name for food web is consumer-resource system. To maintain their bodies, grow, develop, and to reproduce, autotrophs produce organic matter from inorganic substances, including both minerals and gases such as carbon dioxide. These chemical reactions require energy, which mainly comes from the Sun and largely by photosynthesis, which is then passed on to the next consumer. So the correct option is 'interconnection of food chains'.