Bihar Board Class 12 (Science) Biodiversity and Conservation — practice questions
70 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice Bihar Board Class 12 (Science) Biodiversity and Conservation in the app →Which of these is a terrestrial ecosystem?Which is a man-made ecosystem?The basic energy input to any ecosystem is:Green plants in an ecosystem are called:Animals that feed directly on plants are:Producers belong to which trophic level?Energy movement through trophic levels is:The rate of biomass production is called:GPP minus respiration losses equals:The rate at which consumers form new organic matter is:The annual net primary productivity of the biosphere is about:Raw material for decomposition is called:Which is NOT a step of decomposition?Plants capture what share of photosynthetically active radiation?Decomposition is slower when detritus is rich in:Which conditions favour decomposition?The mass of living material at a trophic level is the:The pyramid of biomass in the sea is generally:Which ecological pyramid can never be inverted?Which group is left out of ecological pyramids?Which sociobiologist popularised the term biodiversity?Rauwolfia strains differ in the potency of which active chemical?India has more than how many genetically different strains of rice?Western Ghats outnumber Eastern Ghats in amphibian species. This showsPer IUCN (2004), how many plant and animal species had been described in total?Animals make up roughly what share of all recorded species?Plants, including algae and fungi, form no more than what share of recorded species?Fungal species outnumber the combined species ofWhy is the number of prokaryotic species still unknown?What percentage of the world's land area does India occupy?India's share of global species diversity is aboutIndia is one of how many mega diversity countries of the world?Nearly how many plant species have been recorded from India?If May's global estimate is accepted, what fraction of all species has been recorded so far?For which regions are species inventories of most taxonomic groups more complete?Colombia, near the equator, has nearly how many bird species?India, lying largely in tropical latitudes, has more than how many bird species?Up to how many times more vascular plants can an Ecuador forest hold than a temperate one?The Amazonian rain forest is home to more than how many plant species?At least how many insect species may await discovery in the Amazon rain forests?Which idea links tropical diversity to an absence of past glaciations?Who observed that species richness rises with area, up to a limit?On a logarithmic scale, the species-area relationship appears asWhen whole continents are compared, species-area Z values typically fall in which range?The species-area slope for fruit-eating birds and mammals in tropical forests of different continents isIn the rivet popper analogy, the rivets holding the airplane together stand forThe IUCN Red List (2004) records how many extinctions in the last 500 years?Which animal group appears most vulnerable to extinction?About what share of all amphibian species now face the threat of extinction?How many mass extinction episodes occurred before humans appeared?What does the term Evil Quartet describe?Which forest is often called the lungs of the planet?Amazon rain forest is being cleared to grow which crop?Introducing the Nile perch into Lake Victoria caused extinction of over 200 species of which fish?Carrot grass, an invasive weed in India, belongs to which genus?A host fish dies out and its unique parasites vanish with it. This is calledAbout how many plant species contribute to traditional medicines of native peoples worldwide?The view that every species has intrinsic value, even without economic use, is theBiodiversity hotspots are chosen for high species richness and a high degree ofAn endemic species is one that isAn initial list of 25 biodiversity hotspots was expanded to 34. How many were added?Sacred groves of the Khasi and Jaintia Hills are in which state?Which of these is an example of ex situ conservation?Which IUCN category covers a species that survives only in captivity or cultivation?Which IUCN categories count as threatened?Species that are widespread and abundant in the wild are placed in which IUCN category?In the 2001 IUCN framework, Conservation Dependent was merged into which category?Who first wrote about the biodiversity hotspot concept in 1988?About how many genetically different rice strains does India have?How many varieties of mango are cited for India as genetic diversity?