Assessment – Cell

Questions (Post question title and answer in the comment box below for evaluation and discussion)

1i.Explain what happens to a red blood cell when placed in a hypotonic solution

ii.Mention three conditions that may cause haemolysis

b.Describe an experiment to show the effect of plasmolysis on a fresh filament of spirogyra

ii.How can the process be reversed

c(i).Describe an experiment to demonstrate osmosis using a living material

ii.Give two differences between osmosis and diffusion

d.A normal plants was watered daily with a hypertonic solution for about seven (7) days.

Itwasdiscovered that the plant was not doing well. Explain why.

2a.Define Osmosis

Diffusion

Plasmolysis

(b)      Explain why red blood cells swell and later burst when placed in a distilled water

(c)      State four important of diffusion to animal

3a.      Describe one experiment, using a non-living material to demonstrate osmosis

(b).     Use the result of your experiment to explain how water passes from the soil into the root hair of a plant, through what cell does if then pass on its way to the stem

Objectives

4.The diffusion rates of gases are generally higher than those of liquids because

1. atmospheric air is much lighter than water B.gas molecules move faster than those of liquids.

C.the proportion of the atmosphere which is gaseous is very high..D.liquids tend to cool down

more quicklythan gases do.E. none of the above.

5.Haemolysis is an example of  A. osmosis  B. plasmolysis  C.active transport  D.hydrolysis E.

absorption

6The toad does not normally drink water, but when placed in a dish of salt water, however, a toad

may drink water. This is because the toad   A.is absorbing molecules of salt through the skin  B.is

losing salt too rapidly to its salty enviroment.C. requires salt from its surroundings for its bone

formation D. is losing water from its body to its salty surroundings E.requires water from its

surroundings for a balanced diet as an amphibian.