plants review Flashcards
describe what happens during pollination
pollen grains from an anther are transferred to a stigma so that the male gametes can fertile female gamete
suggest what is meant by the term self pollination
the transfer of pollen from an anther to a stigma
describe how a germinating seed obtains energy for growth
from food reservers stored within seed
what does soda lime do
absorbs carbon dioxide
habitat
the place where an organism lives
population
all the organisms of one species in a habitat
community
all the different species in a habitat
ecosystem
all the organisms living in a particular area and all the non living conditions
abiotic factors
toxic chemicals
environmental conditions
biotic factors
arability of food
number of predators
competition
Describe a method the student could use to obtain a valid comparison of the number of insects in each wheat field.
- several samples / repeat; 2. random; 3. method of randomization; 4. sample at same depth of soil; 5. sample at same time (of year / day / season);
- same stage of wheat growth / same variety of wheat / same species of wheat;
how is energy lost food web
respiration - heat loss - loss in waste - faces
suggest why this food chain cannot support any more tropic levels
because energy is lost at tropic level so there’s not enough to support more levels
suggest why a primed of biomass is more suitable
because DDT is stored in the tissues of animals and a pyramid of biomass represents the mass of the living tissues
suggest why the polythene tunnels are used
to increase the crop yeild as she can create the ideal conditions for photosyneis inside a polythene tunnel and its easier to keep her plants free from pests
