Lyl4Science
WELCOME STUDENTS! FEEL FREE TO READ AND SEARCH FOR SOME LECTURES IN SCIENCE SUBJECTS. ENJOY AND HAVE FUN LEARNING SCIENCE!
Saturday, September 20, 2014
Friday, August 29, 2014
New Rubrics in Performing Laboratory Activity
Grading Rubrics for Lab Work
Score
|
Level
|
Description
|
Safety
|
||
4
|
Advance
|
Obeys all safety rules all of the time; a model of safety
behavior; encourages others to be safe.
|
3
|
Proficient
|
Obeys all critical safety rules
|
2
|
Basic
|
May require an occasional reminder during perceived
non-critical moments to obey safety rules; does not fool around; obeys most
chemical and equipment rules
|
1
|
Novice
|
Consistent not following safety rules; endangers self and
others
|
Participation / Effort
|
||
4
|
Advance
|
Efficiently utilizes all class time; professional work
habits; completes lab
|
3
|
Proficient
|
Utilizes class time constructively; completes lab.
|
2
|
Basic
|
Stays on task most of the time; may or may not complete
lab time allotted
|
1
|
Novice
|
Needs consistent monitoring to stay on task; may or may
not complete lab
|
Data Collection/Observation
|
||
4
|
Advance
|
Actively shares idea; observation, and answers in each
question in the activity; follows all the procedures in conducting experiments
and recording observations; observations are exemplary; helps in identifying
errors in data gathered
|
3
|
Proficient
|
Observations are adequate though more could have been recorded.
Instruments have been read to limits and all units have been recorded.
Sources of error and effect on data have been recorded
|
2
|
Basic
|
Critical data needed to meet basic lab objectives has been
collected. May not have used correct format or followed all guidelines in
expectations. Attempts to identify sources of error and effect on data
|
1
|
Novice
|
Critical data needed to meet basic objectives is missing.
No attempt to identify sources of errors.
|
Techniques
|
||
4
|
Advance
|
Uses all equipment properly. Procedure taken and decisions
made during experiment exemplify chemical literacy. Techniques employed
insure accurate data collection
|
3
|
Proficient
|
Uses all equipment properly. Procedure taken and decisions
made during experiment indicate good chemical literacy. Techniques used allow
for accurate data collection
|
2
|
Basic
|
Most equipment is used properly. Techniques may lead to
inaccurate data collection
|
1
|
Novice
|
Misuse equipment. Appears to have minimal understanding of
how to conduct experiment
|
Clean-Up Procedure
|
||
4
|
Advance
|
Cleans working areas efficiently ( includes table, floor,
and sink) ; returns stools and all equipment clean and in their proper places; Helps in
cleaning working areas without being told
|
3
|
Proficient
|
Cleans working areas; returns all equipment clean and in
their proper places; Helps in cleaning working areas without being told
|
2
|
Basic
|
May require constant reminder in cleaning up procedure
|
1
|
Novice
|
Helping in the cleaning up is inefficient
|
Wednesday, August 27, 2014
Second Quarter Activities for Biotechniques
PLANT PRESS
Materials:Two pcs of plywood, 30cm X 30cm X 1cm
Rubber straps from old bicycle or motorcycle interior tubes
Procedure:
1. Cut the pieces of wood to size.
2. Cut the rubber straps from old interior tires of bicycles or motorcycles.
Illustration:
Notes:
1. Place the plant between several layers of newspapers between the press plates. Wrap the rubber straps around the plates and newspapers to hold them securely.
2. Ropes or heavy strings may be used instead of the rubber straps.
FLOWER MOUNTING
BOTTLE AQUARIUM
Example of bottle aquarium:
BOTTLE TERRARIUM
Examples of bottled terrarium:
Credits to the owners of the pics.
Monday, July 14, 2014
Activity for Biotechniques: Measuring Pollen Size Using a Razor Blade Scores Scale and Microscope
One technique used to determine the size of objects under the microscope is to compare it to an external standard as a razor score scale. This however, is made possible only on straight body tube, monocular microscopes.
OBJECTIVES:
1. To describe pollen grains seen under the microscope.
2. To determine how many times a pollen is magnified under the HPO of the microscope.
3. To illustrate pollen grains as seen under the HPO of the microscope.
4. To measure the size of pollen grains under the microscope using the razor blade scores scale.
MATERIALS:
glass slides
compound microscope
dissecting needle
razor blade scores scale
flowers with pollen grains
PROCEDURE:
1. Dust off some pollen on the surface of the glass slide.
2. Observe under the LPO of the microscope.
Q1. Describe the pollen grains.
3. Then shift to the HPO.
Q2. How many times have these pollen grains been magnified?
Q3. Draw 2 or 3 pollen grains as seen under the HPO. Indicate the magnification.
4. Ussing the dissecting needle, transfer dew pollen grains directly over the razor glade scores scale.
5. Observe the pollen grains under the LPO.
Q4. Describe what you have observed.
Q5. Make an estimated of the size of the specific pollen you are observing.
Q6. If four pollen grains can fit in one scale, What is its estimated size.
OBJECTIVES:
1. To describe pollen grains seen under the microscope.
2. To determine how many times a pollen is magnified under the HPO of the microscope.
3. To illustrate pollen grains as seen under the HPO of the microscope.
4. To measure the size of pollen grains under the microscope using the razor blade scores scale.
MATERIALS:
glass slides
compound microscope
dissecting needle
razor blade scores scale
flowers with pollen grains
PROCEDURE:
1. Dust off some pollen on the surface of the glass slide.
2. Observe under the LPO of the microscope.
Q1. Describe the pollen grains.
3. Then shift to the HPO.
Q2. How many times have these pollen grains been magnified?
Q3. Draw 2 or 3 pollen grains as seen under the HPO. Indicate the magnification.
4. Ussing the dissecting needle, transfer dew pollen grains directly over the razor glade scores scale.
5. Observe the pollen grains under the LPO.
Q4. Describe what you have observed.
Q5. Make an estimated of the size of the specific pollen you are observing.
Q6. If four pollen grains can fit in one scale, What is its estimated size.
Activity for Biotechniques: Making a Razor Blade Scores Scale
In this activity, you will make a scale to measure sizes of objects seen under the microscope.
OBJECTIVES:
1. To use the HPO of the microscope in checking score made by razor blades on TP.
2. To describe the steps in making a razor blade score scale.
MATERIALS:
glass slides
Rubber band transparent tape
razor blades transparency sheet (TP)
Cutting mat or chopping board
scissors / cutter
PROCEDURE
1. Bundle 5 razor blades with rubber band.
2. Place the TP sheet on a cutting mat or chopping board to make scores on the TP sheet with one stroke of the bundle razor blades.
3. Cut out the scored TP sheet about the size of a cover slip.
4. Tape on the sides the scored TP sheet to a glass slide.
5. View under the LPO of the microscope.
6. Are the four spaces even or equidistant to one another? if not repeat 2-4 until you have an equidistant scored sheet.
7. You may have a razor blade scores scale. You will scale in activity.
OBJECTIVES:
1. To use the HPO of the microscope in checking score made by razor blades on TP.
2. To describe the steps in making a razor blade score scale.
MATERIALS:
glass slides
Rubber band transparent tape
razor blades transparency sheet (TP)
Cutting mat or chopping board
scissors / cutter
PROCEDURE
1. Bundle 5 razor blades with rubber band.
2. Place the TP sheet on a cutting mat or chopping board to make scores on the TP sheet with one stroke of the bundle razor blades.
3. Cut out the scored TP sheet about the size of a cover slip.
4. Tape on the sides the scored TP sheet to a glass slide.
5. View under the LPO of the microscope.
6. Are the four spaces even or equidistant to one another? if not repeat 2-4 until you have an equidistant scored sheet.
7. You may have a razor blade scores scale. You will scale in activity.
Thursday, June 26, 2014
Tuesday, October 29, 2013
DNA History
Discovery of the DNA structure
http://www.youtube.com/watch?v=VegLVn_1oCE
DNA Structure and Function
http://www.youtube.com/watch?v=lLGGid17Wno
http://www.youtube.com/watch?v=VegLVn_1oCE
DNA Structure and Function
http://www.youtube.com/watch?v=lLGGid17Wno
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