unit 3 - Flashcards
what is a community
all the organisms in one habitat
what is biodiversity
the variation which exists between organisms of the same species or different species
what is an ecosystem
all of the organisms and ABIOTIC factors in a habitat
give an example or competition in plants and animals
plants - light, water. animals - food, water, habitat
how does oxygen exit the cell in photosynthesis
diffusion
carbon fixation is _________?
controlled by enzymes
give three examples of the fates of sugar produced in photosynthesis?
used for cellulose; converted into ATP and used for active transport; stored in starch
what are the three limiting factors of photosynthesis
carbon dioxide concentration; temperature; light intensity
what are nitrates in soil used for
absorbed into plants to be used for the production of amino acids which are synthesized into proteins
how to animals get amino acids
eat plants or other animals
give one negative effect of using pesticides in farming
pesticides sprayed onto crops can accumulate in the bodies of organisms over time
what happens to pesticides as they are passed along a food chain
pesticides become more toxic as they are passed along a food chain
mutations can be _____?
advantageous, disadvantageous, or neutral
mutations are ______?
random and spontaneous changes in genetic material. the only source of new alleles
give two examples of environmental factors that increase the rate of mutation and what are these factors called
exposure to radiation e.g. UV radiation; chemicals e.g. mustard gas. there are mutagenic agents
