ENVIRONMENTAL SCIENCE CHAPTER 6 BOOK NOTES QUUESTIONS AND ANSWERS WITH SOLUTONS 2024
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Environmental Science
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Environmental Science
ENVIRONMENTAL SCIENCE CHAPTER 6 BOOK NOTES QUUESTIONS AND ANSWERS WITH SOLUTONS 2024
Total species on earth - ANSWER 2 million discovered but estimates go from 5 to 30 million
Biota - ANSWER Natural species of living things collectively referred to together they are responsible for the structur...
ENVIRONMENTAL SCIENCE CHAPTER 6
BOOK NOTES QUUESTIONS AND ANSWERS
WITH SOLUTONS 2024
Total species on earth - ANSWER 2 million discovered but estimates go from 5 to 30 million
Biota - ANSWER Natural species of living things collectively referred to together they are responsible for
the structure and maintenance of all ecosystem s
Biological wealth - ANSWER Biota and the ecosystems they form make this up
Makes up most of ecosystem capital that sustains human life adn economic activities with goods and
services
Biodiversity lost form 1642 to 2001 - ANSWER 631 species with cost being 4.5 trillion a year
Instrumental value - ANSWER Its existence or use benefits some other entity (by providing food shelter
or source of income and this kind of value is usually anthropocentric that is beneficiaries are humans
Intrinsic value - ANSWER It has value for its own sake that it it does not have to be useful to us to possess
value
Values of natural species - ANSWER Value as sources for food and raw materials
Value as sources for medicines and pharmaceuticals
Recreational aesthetic and scientific value
And value for thier own sake
Human agriculture effect on plants an animals - ANSWER They lose protections like genetic variation and
resistance genes as they are cultivated to maximize production and size and lose competativeness
Food plants used by humans - ANSWER We use around 7000 of all plants , and we focus agriculture on
around 30 with three main species produced
, Wheat
Maize corn
And rice fulfill 50% of global demands
We maintain Igor in cultivars by cross breeding and biotechnology to adapt them to different climate
conditions sense high focus on production cause these plants to lose resistance traits
Estimated edible plants - ANSWER 30,000 plants with edible parts could be brought into cultivation
Many could increase production in environments with less than ideal conditions like dry climates
Example a winged bean in New Guinea can grow in super dry environment thought to be unproductive
without irrigation
Lose of biodiversity removes the chance to use these plants
Other plant goods not for food - ANSWER Wood - thought to be in famine within decade from need in
market third in world market behind oil and gas
Rubber oils nuts fruits species and gums
Genetic bank - ANSWER Gene pools fo all species involved in world
They need to be preserved to grow wild relatives to cultivated crops to maintain biodiversity and genetic
variation that we can use
Plant genetic bank is in Millennium seed bank partnership in royal botanic gardens taht have 35% of
worlds plants seeds samples
With 75,000 species by 2020 to be used to be backup for more than 1000 seed banks in world
Zoos purpose - ANSWER Animal genetic bank
Medicinal properties - ANSWER Earths genetic bank is provider of medicines around the world and loss
of biodiviserty inhibits medicinal abilities
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