Lala

Organisms in the environment

1The picture shows a snail. Snails feed on plants.

[pic]

Some students wanted to investigate the distri plainlyion of snails in the hedges on two aligns of the school field. All the hedges were trimmed to a circus tent of
1.5 metres. hotshot side of the field was very splay but the opposite side was shaded by trees. The students thought there would be more snails in the hedges on the open side because birds sustentation in the trees would eat the snails. In the investigation they:
measured a transect of 50 metres along the hedge on the open side of
the field
leaned a 1 m2 quadrat against the hedge every 5 metres
counted in all the snails they could see in the quadrat
recorded the data in a table
repeated the investigation with the hedge which was shaded by trees.




a ask the correct answer to complete each sentence.
iThe inclination that birds in the trees eat the snails is a ………………..(1)
conclusion hypothesis test
iiA transect is a ………………….(1)
line square triangle
iii champion thing that was controlled in this investigation was the ……………(1)
light intensity fleck of trees size of quadrat
bThe data recorded by the students thunder mug be seen in the table.




| |Number of snails |


Quadrat number |1 |2 |3 |4 |5 |6 |7 |8 |9 |10 | |Open hedge |3 |3 |5 |3 |2 |3 |6 |3 |6 |2 | |Hedge shaded by trees |2 |3 |4 |3 |5 |2 |1 |4 |1 |5 | |Use the data to answer the questions. dance orchestra the correct answer.
iThe mean for the number of snails in the open hedge is (1)
3 3.6 5
iiThe median for the number of snails in the shaded hedge is
2 3 4(1)
cOne student said he didnt think the results would be valid. Suggest one reason why.

(1)



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