Biology Lab on Transpiration

AIM: To investigate how wind affects the transpiration rate in plants.

APPARATUS AND MATERIALS: Three plants of the same size and species, water, oil, conical flask, scale, fan, measuring cylinder.

DIAGRAM:

DIAGRAM TO SHOW HOW APPARATUS WAS SET UP

PROCEDURE: 1) Three plants of the same size and species were obtained. The leaves were counted and recorded.

2) The three plants were weighed and recorded.

3) Three conical flasks were labeled A, B and C and 200ml of water was poured into each conical flask.

4) The plants were placed in A, B and C.

5) 25ml of oil was poured into A, B and C and each was weighed and recorded.

6) A was placed in front of a fan, B was placed inside a cupboard and C was placed outside the lab in the open environment.

7) The experiment was left for an hour and after each was reweighed and recorded.

RESULTS: Table of results showing the difference in weight of the plant before and after the experiment.

Plant | Number of leaves | Weight of plant before 1hour/g | Weight of plant and conical flask before 1 hour/g | Weight of plant and conical flask after 1 hour/g | Weight of plant after 1 hour/g |

A | 24 | 9.92 | 313.79 | 310.38 | 6.33 |

B | 29 | 17.02 | 324.34 | 321.97 | 14.65 |

C | 15 | 22.52 | 323.67 | 319.82 | 18.67 |

CALCULATIONS:

To find weight of plant after 1 hour=

Weight of plant before -- (Weight of plant and conical flask before -- Weight of plant and conical flask after)

PLANT A

9.92 – (313.79-310.38) =6.33

PLANT B

17.02 – (324.34- 321.97) = 14.65

PLANT C

22.52 - (323.67- 319.82) = 18.67