Data Table: Amount of Water Transpired in an Hour (ml) Normal With Fan With Heat

Question

Data Table: Amount of Water Transpired in an Hour (ml) Normal With Fan With Heater With Lamp Arrowhead Coleus Devil's Ivy Dieffenbachia English Ivy Geranium Rubber Plant Weeping Fig Zebra Plant 1. Transpiration performs 3 major functions for plants. List them. 1) 2) 3) 2. What is the purpose of the "normal" condition? 3. List the experimental variables in the experiment 4. a)Which variable resulted in the greatest rate of water loss? b) Explain why this factor might increase water loss when compared to the others 5. List 2 anatomical/morphological (structural) adaptations that would enable plants to decrease water loss.

Explanation / Answer

1.

i. Transpiration helps vascular tissue to transport water.

ii. It helps to reduce the tissue temperature.

iii. It helps to maintain a favorable microclimate for proper plant growth.

iv. It also helps to lose excess water in the plants that grow waterlogged ecosystems.

2.

The normal condition serves as a control. Using data from the normal, we can compare the effect of other variables.

3.

Experimental variables = Wind speed (with fan), temperature (heater) and light intensity (lamp).

These are the three factors that mainly affect transpiration rate in plants.

4.

High temperature induced by heater shows maximum effect.

Heater increases the ambient temperature. So, the water evaporation rate and thereby transpiration rate increases.

5.

i. Buried stomata

ii. Thick cuticle

iii. CLosed stomata during daytime in succulent plants

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