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Ask QuestionPosted by Shivansh Das 3 years, 11 months ago
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Rohit Panghal 3 years, 11 months ago
Shruti ? 3 years, 11 months ago
Posted by _Priya _Kashyap_ 3 years, 11 months ago
- 2 answers
Gaurav Seth 3 years, 11 months ago
Presence of cell walls in onion cells only
Human cheek cells are animal cells while the onion peel cells are the plant cells. The major difference between the plant cells and animal cells are the presence of the chloroplast, and cell wall in the plant cells.
Posted by Thenisai Venthan 3 years, 11 months ago
- 1 answers
Gaurav Seth 3 years, 11 months ago
|
Infrasonic |
Ultrasonic |
|
It has frequency less than the audible frequency range. |
It has the frequency greater than the audible frequency range. |
|
Less than 20 Hz |
More than 20000 Hz |
|
Sources: Volcanoes, Earthquakes, etc. |
Sources: Bats, SONAR, etc. |
Posted by Lushanth Ulaganathan 3 years, 11 months ago
- 2 answers
Vijaya Laxmi 3 years, 11 months ago
Yogita Ingle 3 years, 11 months ago
- he moon changes its shape everyday over a period one month and this repeats over and over again. These different shapes of the moon are called 'Phases of the Moon'. In reality, the moon does not change its shape at all. Moon is always round in shape. As we know the moon is always visible because it reflects the light from the sun.
- It goes from a perfect round circle and gradually reduces in size and further becomes a no moon (as shown here). This takes about 15 days. This is called waxing.
Posted by Alka Darade 3 years, 11 months ago
- 4 answers
Bani Singh Bani Singh 3 years, 11 months ago
Rohit Panghal 3 years, 11 months ago
Yogita Ingle 3 years, 11 months ago
There are four types of friction: static, sliding, rolling, and fluid friction.
Static, sliding, and rolling friction occur between solid surfaces.
Static friction is strongest, followed by sliding friction, and then rolling friction, which is weakest.
Fluid friction occurs in fluids, which are liquids or gases
Posted by Niki Gupta 3 years, 11 months ago
- 1 answers
Yogita Ingle 3 years, 11 months ago
An FIR is a first information report which has to be filed whenever a cognisable offence takes place in a locality or an area.
It can be lodged in the following ways:
- The victim or witness should go to the nearest police station and file an FIR .
- The FIR must be hand written,signedand prepared in duplicate.
- The FIR should specify the place,date and time of the incident ,and describe the incident in detail.
- The police officer assigns a registrationand signs and give the informant his or her
- No police officer can refuse to register an FIR.
Posted by Pranay Kansotia 3 years, 11 months ago
- 1 answers
Yogita Ingle 3 years, 11 months ago
When electrodes are immersed in water and electricity passed, the bubbles formed on the positive terminal is actually Oxygen gas.
Posted by Nidhi Dawle 3 years, 11 months ago
- 2 answers
Laxmi Yadav 3 years, 11 months ago
Posted by Sana Ms 3 years, 11 months ago
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Gaurav Seth 3 years, 11 months ago
Causes of water pollution.
- Untreated sewage and effluents from cities are discharged into this river.
- River is used by people for bathing and washing clothes, also for bathing their cattle.
- Cremation of dead bodies on the banks of the Ganges is an age old practice, and this practice pollutes the river water.
- Rivers are preferred for immersing idols, flower and many other leftovers of rituals and worships.
- Many industrial towns are situated on the banks of this river, e.g. Kanpur.
- There are about 5000 industrial units in Kanpur; which include fertilizer, tanneries and paint industries. These factories release harmful chemicals into this river.
- Rampant use of weedicides, pesticides and chemical fertilizers pollute river water and groundwater.
Gaurav Seth 3 years, 11 months ago
Causes of ozone depletion:
- Methyl bromide
- Nitrogen oxides released from freezers, air conditioners, aerosol products and industrial solvents
- Compounds such as CFCs break down into chlorine atoms in the atmosphere. These chlorine atoms break down O3 into oxygen (O2) and nascent oxygen (O).
Posted by Sana Ms 3 years, 11 months ago
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Posted by Manas Rout 3 years, 11 months ago
- 3 answers
Bani Singh Bani Singh 3 years, 11 months ago
Rohit Panghal 3 years, 11 months ago
Yogita Ingle 3 years, 11 months ago
The medicines which kill or stop the growth of microorganisms in our body are called antibiotics. These are very useful to us as they prevent us from the effects of microorganisms. Antibiotics are made from bacteria and fungi. The penicillin is the first antibiotics which is discovered by Alexander Fleming in 1929.
Posted by Lushanth Ulaganathan 3 years, 11 months ago
- 1 answers
Yogita Ingle 3 years, 11 months ago
The term “prokaryote” is derived from the Greek word “pro“, (meaning: before) and “karyon” (meaning: kernel). It translates to “before nuclei.“
Prokaryotes are one of the most ancient groups of living organisms on earth, with fossil records dating back to almost 3.5 billion years ago.
These prokaryotes thrived in the earth’s ancient environment, some using up chemical energy and others using the sun’s energy. These extremophiles thrived for millions of years, evolving and adapting. Scientists speculate that these organisms gave rise to the eukaryotes.
The term “Eukaryotes” is derived from the Greek word “eu“, (meaning: good) and “karyon” (meaning: kernel), therefore, translating to “good or true nuclei.” Eukaryotes are more complex and much larger than the prokaryotes. They include almost all the major kingdoms except kingdom monera.
Structurally, eukaryotes possess a cell wall, which supports and protects the plasma membrane. The cell is surrounded by the plasma membrane and it controls the entry and exit of certain substances.
Posted by Prachi Saxena 3 years, 11 months ago
- 2 answers
Posted by Prachi Saxena 3 years, 11 months ago
- 1 answers
Yogita Ingle 3 years, 11 months ago
Which of the following object is generally electroplated?
- Plough
- Cycle handle
- Car engine
- Frying pan
Cycle handle
Posted by Royal Rathi Gaming 3 years, 11 months ago
- 2 answers
Prachi Saxena 3 years, 11 months ago
Gaurav Seth 3 years, 11 months ago
Frictional force causes a lot of losses in general upkeep and wear and tear of machinery. Hence it is considered as a evil. But almost all crucial tasks cannot be carried out without the presence of friction. Basic activities like walking and writing on a surface are possible due to friction. Hence it is considered as a necessary evil .
Posted by Saroj Bala 3 years, 11 months ago
- 3 answers
_Priya _Kashyap_ 3 years, 11 months ago
Prachi Saxena 3 years, 11 months ago
Yogita Ingle 3 years, 11 months ago
The laws of reflection determine the reflection of incident light rays on reflecting surfaces, like mirrors, smooth metal surfaces, and clear water.
Following are the laws of reflection:
- The incident ray, the reflected ray and the normal to the surface of the mirror all lie in the same plane.
- The angle of incidence is equal to the angle of reflection.
Posted by August Prakash 3 years, 11 months ago
- 3 answers
Gaurav Seth 3 years, 11 months ago
Microorganisms are useful as well as harmful also, in fact, some microbes are very helpful but most of them are harmful to living beings.
1. Some microorganisms are pathogens which cause diseases to human animals and plants.
2. Bacteria and fungi are well known to cause food spoilage and make them unfit for eating.
3 Bacteria cause some diseases like cholera, typhoid, and diarrhea through water and food.
4. Virus scan causes smallpox, cold, hepatitis polio and soon.
5. Some microorganisms show antibiotic resistance to certain diseases.
Posted by Disha Deshmukh 3 years, 11 months ago
- 2 answers
Posted by Shruti ? 3 years, 11 months ago
- 2 answers
Yogita Ingle 3 years, 11 months ago
RBCs are the biconcave cells and without nucleus in humans; also known as erythrocytes. RBCs contain the iron-rich protein called haemoglobin; give blood its red colour. RBCs are the most copious blood cell produced in bone marrows. Their main function is to transport oxygen from and to various tissues and organs.
Leucocytes are the colourless blood cells. They are colourless because it is devoid of haemoglobin. They are further classified as granulocytes and agranulocytes. WBCs mainly contribute to immunity and defence mechanism.
Following are the important functions of the nuclear membrane:
- The nuclear envelope has tiny holes which are identified as nuclear pores. The pores enable the content to flow in and out of the nucleus. It also connects the outer membrane and the inner membrane.
- The nuclear envelope’s surface area extends and doubles the nuclear pores during the interphase part of cell division.
- Nuclear membrane shields the nucleus with a double membrane by many pores that help in controlling the crossing of macromolecules such as proteins and RNA and permit free passage of water, ions, ATP and small molecules. The membrane controls the flow of information in the cell as it is conducted by the macromolecules.
Posted by Asutosh Dani 3 years, 11 months ago
- 3 answers
Prachi Saxena 3 years, 11 months ago
Gaurav Seth 3 years, 11 months ago
The concept of friction force. There are many forces in nature such as gravitational force, nuclear force, friction force, magnetic force etc. Pull or push acting upon a body which results in the interaction of the body with another object.
Posted by Priyadarshini Behera 3 years, 11 months ago
- 3 answers
Posted by Priyadarshini Behera 3 years, 11 months ago
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Gaurav Seth 3 years, 11 months ago
A device called Seismograph is used to record seismic waves produced during earthquakes on the surface of the earth. The purpose is to measure the motion or movement of ground during an earthquake
Seismograph are generally connect to bedrocks which are considered comparatively more stable to earthquakes than buildings, other concrete structures, trees etc
Posted by Shalini Murthy 3 years, 11 months ago
- 2 answers
Prachi Saxena 3 years, 11 months ago
Yogita Ingle 3 years, 11 months ago
1. Climate change
Changes in climate throughout our planet's history have, of course, altered life on Earth in the long run — ecosystems have come and gone and species routinely go extinct.
2. Deforestation and habitat loss
3. Overexploitation
4. Invasive species
5. Pollution
Posted by Anamta Fatima 3 years, 11 months ago
- 4 answers
Prachi Saxena 3 years, 11 months ago
Yogita Ingle 3 years, 11 months ago
Angle between incident ray and normal =30∘
So, angle between incident ray and mirror =900−300=60∘= Angle between reflected ray and mirror
Angle between normal and the mirror is always 90∘
Angle of reflection =30∘
Posted by Laksh Raj Singh 3 years, 11 months ago
- 3 answers
Yogita Ingle 3 years, 11 months ago
Microscope was the instrument was essential for the study of cells.
Posted by Banarasiya Don???? 3 years, 11 months ago
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Banarasiya Don???? 3 years, 11 months ago
Posted by Manish Sharma 3 years, 11 months ago
- 4 answers
Prachi Saxena 3 years, 11 months ago
Banarasiya Don???? 3 years, 11 months ago
Ram Budania 3 years, 11 months ago
Yogita Ingle 3 years, 11 months ago
• Lustre: Metals in the pure state generally shine. The shine on the metallic surface is called the metallic lustre.
• Malleability: The property of metals by which they can be beaten into thin sheets is known as malleability.
For example, silver metal is beaten to make silver foil used for decorating sweets.
• Ductility: It is one of the properties of metals by virtue of which they can be drawn into wires. For example, copper and iron can be drawn into wires.
• Conductivity: Metals are good conductor of heat and electricity. Heat and electricity can pass through them.
• Sonorous: Metals produce a ringing sound when struck hard. So, they are called sonorous.
• Solid: All metals are solid except Mercury, the only metal which is liquid at room temperate. We can cut sodium (Na) and potassium (K) metals with the help of a knife. Mercury, sodium and potassium are exceptional metals. Examples of metals: iron, copper, gold, aluminium, silver, calcium etc.
Posted by Priya Kumari 3 years, 11 months ago
- 5 answers
Bani Singh Bani Singh 3 years, 11 months ago
Prachi Saxena 3 years, 11 months ago
Ram Budania 3 years, 11 months ago
Meghna Thapar 3 years, 11 months ago
The push or pull of an object is considered a force. Push and pull come from the objects interacting with one another. Terms like stretch and squeeze can also be used to denote force.
In Physics, force is defined as: The push or pull on an object with mass that causes it to change its velocity.
Force is an external agent capable of changing the state of rest or motion of a particular body. It has a magnitude and a direction. The direction towards which the force is applied is known as the direction of the force and the application of force is the point where force is applied.
The Force can be measured using a spring balance. The SI unit of force is Newton(N).
Shruti ? 3 years, 11 months ago
Posted by Nidhi Joshi 3 years, 11 months ago
- 4 answers
Gaurav Seth 3 years, 11 months ago
A n s w e r : humans, cows, dogs and hens.
Fertilization which takes place inside the female body is called internal fertilization. Internal fertilization occurs in many animals including humans, cows, dogs and hens.
Posted by Shruti ? 3 years, 11 months ago
- 2 answers
Yogita Ingle 3 years, 11 months ago
Liquid pressure increases with increasing depth. To withstand the greater pressure at the bottom of a water reservoir, dams are thicker at the bottom than at the top.
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Harshitha Reddy 3 years, 11 months ago
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