The Human Circulatory System
Watch this video and you wil undrstand how blood circulates in you body!
To investigate the effect of changes in air movement on the rate of transpiration of a plant.
ANSWER
CHAPTER 10 – TRANSPORT IN PLANT (PEKA using microscope)
Objective
|
To investigate the effect of changes in air movement on the rate of transpiraton of a plant.
| ||||||||||||
Problem statement
|
What are the effects of the air movement on the rate of transpiration of a plant?
| ||||||||||||
Hypothesis
|
The faster the air movement, the greater/higher the rate of transpiration of a plant.
| ||||||||||||
Variables
|
Manipulated : Air movement
| ||||||||||||
Responding : The distance traveled by air bubble in 10 minutes//Rate of transpiration
| |||||||||||||
Constant : Surrounding temperature / light intensity/ relative humidity/ type and size of plant used/ time
| |||||||||||||
Apparatus and materials
|
Apparatus (A)
Potometer, beakers, knife, basin, stopwatch
Materials (M)
Leafy shoot, colour water, vaseline
| ||||||||||||
Technique
|
Measure and record the distance traveled by the air bubble in potometer in 10 minutes using a ruler// Calculate the rate of transpiration using the formula : Distance traveled by air bubble÷time (cm/min)
| ||||||||||||
Procedure
|
1. Setup the apparatus as shown in diagram above.
2. Choose a leafy shoot and cut the shoot end in water.
3. Insert cut stem in the potometer.
4. Adjust and mark the initial position of the air bubble.
5. Dry the surface of the leaves before the start of the experiment.
6. The light intensity / temperature of the surrounding must be maintained throughout the experiment.
7. Measure the distance traveled by the air bubble in 10 minutes for each condition of air movement
8. Carry out the experiment in still air, slow and fast moving fan.
9. Use the same type and length of leafy shoot for all 3 experiments.
Precaution
1. The joint end of the stem and apparatus is smeared with vaseline to ensure no water leakage and the apparatus is airtight.
2. The surface of the leaves must be dry before the start of the experiment.
| ||||||||||||
Recording data/ result
|
| ||||||||||||
Conclusion
|
Hypothesis is accepted. The faster the air movement, the greater/higher the rate of transpiration of a plant.
|
1. Aim/ Objective : To study the function of xylem tissues in flowering plant.
2. Problem Statement: Do xylem tissues transport water?
3. Hypothesis : Xylem tissues transport water.
4. Variables
Manipulated : Types of vascular tissues, xylem tissues and phloem tissues
Responding : Red stain on the xylem tissues
Fixed : Types of plant / balsam plant // types of staining / eosin
5. Material : Eosin , balsam plant , distill water
Apparatus : White tile , conical flask , pen-knife ( scalpel ), glass slide , cover slip , microscope , forceps
6. Technique : Observing, drawing and identifying the presence of red eosin stain on the xylem tissues
7. Procedure :
1. Roots of the balsam plant are washed under running tap water to get rid of the soil.
2. The balsam plant is then placed in a conical flask containing 200 ml of eosin.
3. The balsam plant is placed under bright situation for 30 minutes. After 30 minutes, the balsam plant is removed from the conical flask, then the roots are washed under running water to get rid of the excess eosin.
4. Two parts of the plant, the roots and the stem are observed.
5. A pen-knife (scalpel) is used to cut a thin cross section of the roots.
6. The section is mounted in a drop of water on a microscopic slide and is covered with a cover slip.
7. The section is examined under a microscope using low power objectives lens.
8. Diagram of the cross section of the roots is drawn.
9. The structures that are stained red with eosin are shaded and labeled.
10. Steps 6-9 are repeated for the stem.
8. Result :
The Cross Section Root And Stem Of A Balsam Plant
(a) Root
(b) Stem
Magnification: 10 x 40
Discussion :
Xylem tissues in the root and stem are stained red with eosin.
Phloem tissues in the root and stem are not stained red with eosin.
Xylem tissues transport water and phloem tissues do not transport water.
9. Conclusion : Xylem tissues transport water. Hypothesis is accepted
No comments:
Post a Comment