Food Security MCQ
Food security, as defined by the United Nations’ Committee on World Food Security, means that all people, at all times, have physical, social, and economic access to sufficient, safe, and nutritious food that meets their food preferences and dietary needs for an active and healthy life.
21. Which ecosystem produce the highest annual net primary productivity?
a) Tropical evergreen forest
b) Tropical rain forest
c) Tropical deciduous forest
d) Temperate evergreen forest
Explanation: Tropical rain forest produce mean NPP of 2200(g/m2/yr) the world NPP is 37.4(109 tons/yr). Tropical rain forest produce mean biomass of 45(Kg/m2) and the world biomass is 763(109 tones). Hence tropical rain forest ecosystem produces the highest annual net primary productivity(NPP).
22. What flows through the ecosystem while matter cycles within them?
a) Energy
b) Force
c) Pressure
d) Wind
Explanation: Ecosystem maintains themselves by cycling energy and nutrients obtained from external sources. At the first tropic level, primary producers are solar energy to produce organic plant material through photosynthesis.
23. Total primary production in an ecosystem is known as____________________
a) Gross final production
b) Gross primary production
c) Gross middle production
d) Net primary production
Explanation: The total amount of productivity in a region is gross primary productivity. Primary productivity is the rate at which energy is converted by photosynthetic and chemosynthetic autotrophy to organic substances.
24. Which type of ecosystem accounts for most of the net primary productivity on earth even though it has a low average net primary productivity?
a) Tropical rain forest
b) Desert
c) Tropical evergreen forest
d) Oceans
Explanation: The open oceans account for most of the net primary productivity on the planet even though they have one of the lowest average net primary productivities which cover by far the most area on earth.
25. Generally ecosystem consists of how many basic components?
a) One
b) Two
c) Three
d) Four
26. The three functional components interact with each other to form__________________
a) Environmental succession
b) Environmental depression
c) Environmental system
d) Ecology
Explanation: The three functional components of an ecosystem which are inorganic constituents, organism and energy input forms environmental system. An ecosystem is a functional and life sustaining environmental system.
27. The dominant second tropic level in a lake ecosystem is_____________________
a) Phytoplankton
b) Zooplankton
c) Plankton
d) Benthos
Explanation: Lake ecosystem includes both biotic and abiotic components. Zooplanktons are the organisms that have animal like traits. Most of them are heterotrophy in nature. Zooplankton is a vital component of fresh water food webs.
28. Green plants are the most important organisms for an ecosystem.
a) True
b) False
Explanation: Green plants form the basis for the sustainability and long term health of the environmental system. Green plant removes carbon dioxide from the atmosphere and generates oxygen required for breathing for other organisms include humans.
