nitrogen cycle Flashcards
1
Q
bacteria and fungi are called decomposers because
A
they break down the dead remains and release the chemicals for the plants to use again
2
Q
- the nitrogen fixing bacteria absorb … and reduce it to …
A
nitrogen
ammonia
3
Q
- the process of reducing nitrogen to ammonia is called
A
nitrogen fixation
4
Q
- ammonia is converted to nitrites & nitrates by
A
nitrifying bacteria
5
Q
- the process of converting ammonia to nitrites&nitrates is called
A
nitrification
6
Q
nitrogen fixation is when
A
you reduce nitrogen to ammonia
7
Q
nitrification is when
A
you convert ammonia to nitrites and nitrates
8
Q
- plant roots can only absorb
A
nitrates
9
Q
- the nitrates are combined with carbohydrates to form
A
amino acids
(then made to proteins and nucleotides)
10
Q
- the proteins and nucleotides made from amino acids join to make
A
DNA and RNA
11
Q
- animals … plants
A
eat
12
Q
- animals … the proteins and DNA in plants
A
digest
13
Q
- the proteins & DNA absorbed by the animal is used to … new proteins and DNA (a….)
A
synthesise new proteins and DNA (assimilation)
14
Q
- when a plant or animal dies its tissues are
A
decomposed
15
Q
- when they are decomposed by bacteria and fungi it is
A
saprotrophic feeding
