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Answer:
11) This bacterium uses the free oxygen within the water to degrade the pollutants in the wastewater and then converts it into energy that it can use to grow and reproduce.
12)The magnetic field disappears when the current is turned off.
13)Loam soils are best for plant growth because sand, silt, and clay together provide desirable characteristics.
14) We can replace the fuse by a piece of nichrome as it has a low melting point.
15) It reduces itching and alleviates the sting associated with ant bites.
16)clayey soil is made up of soil particles less in size compared sandy soil. √ clayey soil has more water holding capacity compared to sandy soil.
17)Length,thickness and nature of material.
18) A horizon provides the best environment for the growth of plant roots, microorganisms, and other life.
19)
Take a plastic funnel and a filter paper. Fold the filter paper and place it in a plastic funnel. Now keep the funnel (with filter paper) in a beaker. Take some dry powdered soil and weigh it on a balance.
Note the mass of the soil taken. Now pour this weighed soil into the filter paper fixed in a funnel.
Take a measuring cylinder and fill it with water. Note the initial volume of water in the measuring cylinder. Take water from measuring cylinder with the help of a dropper and pour it drop by drop on the soil kept in the funnel. Be careful that water should not fall at one spot on the soil but should be poured uniformly all over the soil. Keep pouring water till it starts dripping from the lower end of the funnel.
Dripping of water from funnel shows that the soil taken on the filter paper has absorbed the maximum amount of water. Note the final volume of water that is left unused in the measuring cylinder.
By substracting the amount of water left in the measuring cylinder from the amount of initial volume of water taken in the measuring cylinder. We will get the volume of water absorbed by the soil which was taken on filter paper in the funnel. The difference in two reading gives the amount of water retained by the soil.
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21)No, because it only has a tendency to attract magnetic substances
22). Experiment to demonstrate the transpiration phenomenon with the bell jar method:
Requirements: Bell jar, well-watered potted plant, rubber sheet, glass plate, Vaseline.
Method:
1. Take a well-watered, healthy potted plant and cover the pot with the help of rubber sheet. Only aerial parts of the plant should remain uncovered.
2. Keep the potted plant on a glass plate and cover it with a bell jar .
3. Apply vaseline at the base of the bell jar to prevent the outer air to pass in the bell jar.
4. Keep the whole apparatus in light and observe for some time.
5. Set another experiment exactly in the same way except that the pot should be without any plant.
Observations: Water drops appear inside the wall of the bell jar containing a potted plant while there is no drop in the another bell jar which is without any plant.
Results: Because water drops appear only in the bell jar in which pot is having a plant with its only aerial parts exposed, so it can be concluded that these drops appeared due to the process of transpiration from the aerial parts of the plant. The same can also be concluded by the observations of the control apparatus, in which no water drop appears due to the absence of plant in the pot.
23)Algae grew again as terrace fulfilled all the requirements it needed to stay alive such as water, sunlight etc.
24) A septic tank is an underground chamber made of concrete, fiberglass, or plastic through which domestic wastewater (sewage) flows for basic treatment. Settling and anaerobic processes reduce solids and organics
25)Characteristics of the image formed by a plane mirror : The image formed by a plane mirror is virtual. The image formed by a plane mirror is erect. The size of the image formed by a plane mirror is same as that of the size of the object.
26)The process for extracting salt from sea water is an ancient technology and involves evaporation ponds. Shallow, water-proof ponds are dug out and connected to the sea by means of a short canal. A broad area and shallow depth allow a given volume of water to absorb more sunlight. The pond is flooded, and then the canal is closed. The sun evaporates the water. As the water vaporizes, the salt remains behind, creating ever-more saline water. Eventually enough of the water evaporates to leave behind a layer of sea salt crystals that can be harvested.
Explanation:
Answer:
The Joads. Because the Joads are fictional characters who represent nameless thousands, the Grapes of Wrath is not a historical novel. ... This is a historical novel because it's based on the actual historical figures of Anne Boleyn and Henry VIII, among others.
Explanation:
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