नमस्कार विद्यार्थी मित्रांनो Study of suspended particulate matter in air at the two widely different sites, in your area हे प्रॅक्टिकल Experiments to be performed - PART A मधील आहे. याचाच अर्थ तुम्हाला हे प्रॅक्टिकल Exam मध्ये Examiner ला Performe करून दाखवायचे आहे. म्हणूनच प्रॅक्टिकल Exam च्या दृष्टीने हे Experiment अतिशय महत्त्वाचे आहे. या ब्लॉग मध्ये आपण Practical Book मधील या Experiment Number - 6 ची उत्तरे पाहणारं आहोत. ही उत्तरे काळजीपूर्वक वाचून आपल्या Practical Book मध्ये लिहा किंवा तुमच्या कॉलेजमधील संबंधित विषय शिक्षकांची मदत घ्या.
6. Study of suspended particulate matter in air at the two widely different sites, in your area.
Aim :- To study the suspended particulate matter on the leaves collected from different sites.
Requirements :- Slides, coverslips, ear buds, microscope, leaves of roadside plants and leaves of a plant from a glass house if available.
• While walking on a busy road, in a crowded market or in an industrial area, and then wiping the face with a white cotton cloth. One can observe a large amount of pollutants (dirt) collected on it.
Procedure :- 1. Take two leaves from the same location of the same plant. Wash one leaf under the tap and leave other leaf as it is (i.e. unwashed). Put drop of glycerine on the surface of leaves.
2. Spread glycerine with the help of a clean ear bud.
3. Smear this ear bud on a clean slide, observe under a microscope.
4. Prepare separate slides for each sample.
5. This experiment can also be performed by following method.
Observation :- We can observe many air pollutants such as dust particles, carbon particles, pollen grains, sports, etc.
Observation Table :-
| Sr. no. | Leaf sample | Observation |
|---|---|---|
| 1. | Washed leaf | Smoke, dust and particulate matter is absent on slide under microscope. |
| 2. | Unwashed leaf | Smoke, dust, pollen grains and particulate matter are observed on slide under the microscope. |
Inferences :- The concentration of suspended particles is higher in areas with heavy vehicle traffic compared to areas with less traffic. This is because the air in high-traffic areas contains more smoke, dust, and particulate matter.
Give the reasons for washing one leaf :- Washing one leaf creates conditions similar to those found in unpolluted air.
Questions
1. What is air pollution?
Ans :- Air pollution is the introduction of contaminants into the natural environment, causing adverse changes.
2. Enlist the different air pollutants.
Ans :- There are six main air pollutants: carbon monoxide, lead, nitrogen oxides, ground-level ozone, particulate matter, and sulfur oxides.
3. Do you know any disease caused by air pollution?
Ans :- Yes, diseases caused by air pollution include asthma, chronic obstructive pulmonary disease (COPD), and lung cancer.
4. Write note on Electrostatic precipitator.
Ans :- An electrostatic precipitator (ESP) is a filtration device used to remove fine particles, such as dust and smoke, from a flowing gas. It operates by applying a high-voltage electrostatic charge to the particles, which are then attracted to and collected on plates. The wires in the ESP, maintained at several thousand volts, release electrons that help in charging the particles.
5. What is CNG?
Ans :- CNG, or compressed natural gas, is an eco-friendly alternative to gasoline. It is made by compressing natural gas to less than 1% of its original volume. CNG fuel is safer than gasoline and diesel because it is non-toxic and does not contaminate groundwater.
6. How to control air pollution?
Ans :- Air pollution can be controlled by minimizing and reducing the use of fire and fire-related products. Since industrial emissions are a major cause of air pollution, treating or controlling pollutants at the source can significantly reduce their impact.
7. How are air pollutants harmful to plants?
Ans :- Air pollutants combine with water droplets in clouds to form acid rain, which can destroy crops and plants. Additionally, air pollutants can alter the physiological processes of plants, affecting their growth patterns.
Multiple Choice Questions
1. Carbon dioxide is called green-house gas because...
a. Used in greenhouse to increase plant growth
b. Transparent to sunlight but traps heat
c. Transparent to sunlight but do not trap heat
d. Used in photosynthesis
Ans :- b. Transparent to sunlight but traps heat
2. The scrubber is used to remove glasses like...
a. Carbon dioxide
b. Sulphur dioxide
c. Carbon monoxide
d. Nitrogen dioxide
Ans :- b. Sulphur dioxide
3. Which of the following size of particulate matter causes greater harm to human health?
a. 2.5 micrometre in diameter
b. More than 2.5 micrometre in diameter
c. 4.5 micrometre in diameter
d. More than 4.5 micrometre in diameter
Ans :- a. 2.5 micrometre in diameter
4. Which of the following devices is used for removing particulate matter in thermal power plants?
a. Electrostatic precipitator
b. Scrubber
c. CNG
d. Catalytic converter
Ans :- a. Electrostatic precipitator
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