diffusion and osmosis Flashcards
name the substance that causes change in mass of the plant tissue
water
explain the term diffusion
spreading out of molecules from a region of higher concentration to a region of lower concentration
explain the term osmosis
movement of water molecules across a semi permeable from a region of higher water concentration to a region of lower concentration
describe in detail what happens to a plant cell that is placed in a solution with less dissolved solutes than its cytoplasm
water enters the cell, the cell becomes turgid
describe what would happen to an animal cell if it was exposed to a place in a solution with less dissolved solutes than its cytoplasm
burst
describe the biological basis and the advantage of having high salt or water concentration on food
water leaves the cell of micro-organisms present and they die which results in an extended shelf life
living cells can be classified into two major types based on the presence or absence of cell organelles. what are the names of these two major types of cells
-eukaryotic
-prokaryotic
how do turgid cells remain its shape
cell wall
outline how a scientist uses a coverslip
lowered at an angle
explain why a coverslip is used
to prevent cell from drying out
when prepping a sample of a cheek cells on a microscope slide, why did you apply methylene blue to the cells
to stain the cells to see clearer
when extracting DNA from plant tissue, why did you use washing up liquid
breakdown membrane
when extracting DNA from plant tissue, why did you use freezer cold ethanol
to make DNA insoluble
when using seeds to investigate the effect of IAA on plant tissue, why did you carry out a serial dilution of an IAA solution
to make solutions of different concentrations
when using seeds to investigate the effect of IAA on plant tissue, why did you place the seeds on a grid in petri dishes
to measure the growth
when carrying out an activity to investigate osmosis why did you use visking tubing
act as a selectively permeable membrane
when carrying out an activity to investigate osmosis how did you know osmosis had taken place
tubing got fuller
give a detailed explanation for - high sugar or high salt concentration are used in preservation of food
food decay by bacteria
what is the purpose of replicates in scientific experimentation
to verify result
what is meant by the term hypothesis
an untested explanation
when investigating the conditions necessary for seed germination, describe how you provided an oxygen free environment
boiled water which has been cooled
when investigating the conditions necessary for seed germination, describe how you determined that germination had taken place
radicles observed
how did you prepare the section of a dicotyledonous stem
cut a thin section
when isolating DNA from plant tissue give a reason for adding salt to the chopped plant tissue
to clump DNA
