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Ask QuestionPosted by Piya Yadav 4 years, 8 months ago
- 3 answers
Zaid . 4 years, 8 months ago
Ayush Upadhyay 4 years, 8 months ago
Yogita Ingle 4 years, 8 months ago
1)Cork:- Cork cambium is a tissue found in many vascular plants as part of the epidermis. The cork cambium is a lateral meristem and is responsible for secondary growth that replaces the epidermis in roots and stems. The function of cork cambium is to produce a cork, a tough protective material.
2)Stomata:- The main function of stomata is to open and close the pores in the leaves for an exchange of gases. It allows the plant to taken in carbon dioxide and give out oxygen for photosynthesis.
Posted by Sahil Vinod Darekar 4 years, 8 months ago
- 2 answers
Posted by Smriti Dubey 4 years, 8 months ago
- 3 answers
Zaid . 4 years, 8 months ago
Aishwarya Satish 4 years, 8 months ago
Shruti B 4 years, 8 months ago
Posted by Jaynit Kumar 4 years, 8 months ago
- 1 answers
Gaurav Seth 4 years, 8 months ago
Total distance covered 10m in 40sec
Total time taken= 2min 20sec= 140sec
Total round completed = 140/40=3.5 rounds
So If an object moves from A to D, the shortest path will be from A to C. So displacement is AC, that we will find by phythogoras theorem.
AC2= AB2 +BC2
AC2= (10)2 +(10)2
AC2= 100+100
AC2=200
AC = (200)1/2
AC= 10× (2) ½ or 10√2 m
Posted by Yuvraj Kumar 4 years, 8 months ago
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Bhumi Ahuja 4 years, 8 months ago
Posted by Damini Damini 4 years, 8 months ago
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Gaurav Seth 4 years, 8 months ago
The purpose of your heart is to pump blood to the organs and tissues of your body that need the oxygen and nutrients it carries. Oxygen-rich blood is pumped out of the left side of your heart (shown on the right in the diagram) into the arteries to these tissues and organs.
Blood that has delivered its nutrients and oxygen and is in need of oxygen comes back to your heart in the veins and enters the right hand side of the heart. This blood which is in need of oxygen (so-called deoxygenated blood) is sent to your lungs to pick up oxygen and get rid of carbon dioxide.
Posted by Barsha Rani Sahu 4 years, 8 months ago
- 3 answers
Gaurav Seth 4 years, 8 months ago
cRutherford’s Model of Atom (By Ernest Rutherford in 1909)
This was based on an experiment in which α – particles were bombarded on a thin gold foil.
Observations of Rutherford’s α-particle scattering experiment are:
(a) Most of the α – particles passed without any hindrance.
(b) Some of the α – particles deflected from their original path at a noticeable angle.
(c) Very few of the α – particles bounced back at their original path.
Postulates of Rutherford’s Model of Atom:
(a) Most of the part in an atom is empty.
(b) There is a positively charged center in atom, which contains nearly the whole mass of atom. The centre is called nucleus.
(c) The size of nucleus is very small compared to an atom.
(d) Electrons revolve round the nucleus.
Drawbacks of Rutherford Model
(a) According to Rutherford’s Model, electron revolves round the positively charged nucleus which is not expected to be stable. But a charged particle in an accelerated motion along a circular path would continuously undergo loss of energy and finally would fall into nucleus. This makes an atom unstable while atoms are quite stable.
(b) Rutherford model could not solve the problem of atomic mass of atom as it proposed only the existence of protons in the nucleus.
Posted by Nikita Singh 4 years, 8 months ago
- 0 answers
Posted by 9N_14_Janvi Chaudhary 4 years, 8 months ago
- 3 answers
Satyam Kumar 4 years, 8 months ago
Posted by Sujeet Kumar 4 years, 8 months ago
- 1 answers
Gaurav Seth 4 years, 8 months ago
| Gravitation | Gravity |
| It is a universal force | It is not a universal force |
| It is a weak force | It is a strong force |
| The force is F=(GM1M2)/R2 (G= gravitational constant) | The force is F=mg (g=acceleration due to gravity) |
| The direction of gravitational force lies in the radial direction from the masses | The direction of the force of gravity is along the line joining the earth’s center and the center of the body. Its direction is towards the center of the earth. |
| The force can be 0 when the separation between bodies is infinity | The force of gravity can be 0 at the center of the earth |
| It requires two masses | It requires only one mass |
Posted by Jyotishacharya Kaur 4 years, 8 months ago
- 4 answers
Posted by Ashmita Kaur 4 years, 8 months ago
- 1 answers
Gaurav Seth 4 years, 8 months ago
For the bus,
Initial Velocity, u = 20 m/s
Final Velocity, v = 0 m/s
Acceleration, a = -5m/s² (minus sign because of deceleration)
Time, t = (?)
We know that,
a = (v - u)/t
∴t = (v - u)/a
∴t = (0 - 20)/(-5)
∴t = (-20)/(-5)
∴t = 4s
Thus, the bus will take 4 seconds to stop.
Posted by Ashmita Kaur 4 years, 8 months ago
- 1 answers
Posted by Jaskirat Singh 4 years, 8 months ago
- 2 answers
Gaurav Seth 4 years, 8 months ago
Given
Atomic mass of Na = 23 u
Atomic mass of Fe = 56 u
Then, gram atomic mass of Na = 23 g
Now, 23 g of Na contains = 6.022 x 1023 g number of atoms
Thus, 100 g of Na contains = 6.022 x 1023 / (23 x 100 number of atoms)
100 g of Na contains = 2.6182 x 1024 number of atoms
Then, gram atomic mass of Fe = 56 g
Now, 56 g of Fe contains = 6.022 x 1023 g number of atoms
Thus, 100 g of Fe contains = 6.022 x 1023 / (56 x 100 number of atoms)
100 g of Fe contains = 1.0753 x 1024 number of atoms
Therefore, 100 grams of sodium contains more number of atoms than 100 grams of iron.
</article>Posted by Shruti B 4 years, 8 months ago
- 1 answers
Gaurav Seth 4 years, 8 months ago
When an object moves in a straight line without coming back, it’s displacement and distance magnitude will always be equal.
We know that displacement is a vector quantity and distance is a scalar quality.
Suppose you walk on a line PQR, say you walk from P to R and then back to Q.
Now your total displacement will be given by the equation PR – RQ because displacement considers direction. But, it is important to note that the distance travelled will be PR + RQ because the distance is a scalar quantity and doesn’t consider direction.
Posted by Neha Barthwal 4 years, 8 months ago
- 1 answers
Gaurav Seth 4 years, 8 months ago
| Basis | Atom | Molecule |
| Meaning | They are tiny particles of an element that can or cannot occur freely. | Molecule is a set of atoms that came together by a bond. Also, they are the smallest unit of a compound. |
| Existence | They may or may not exist freely. | They exist in a free state. |
| Contains | It contain a nucleus (proton, and neutron) and electron. | It contains two or more different or identical elements that bonded together. |
| Shape | They have a spherical shape. | They have a triangular, linear or angular shape. |
| Visibility | Not visible to naked eyes and also not to magnifying microscope | Not visible to naked eyes but are visible through a magnifying microscope |
| Reactivity | They are highly reactive and subject to certain exceptions | It is comparatively less reactive. |
| Bond | It has a nuclear bond. | It has a covalent bond. |
Posted by Aditya Dubey 4 years, 8 months ago
- 1 answers
Neha Barthwal 4 years, 8 months ago
Posted by Aditya Dubey 4 years, 8 months ago
- 4 answers
Shakshi Pandey 4 years, 8 months ago
Neha Barthwal 4 years, 8 months ago
Posted by Pushp Sharma 4 years, 8 months ago
- 0 answers
Posted by Pushp Sharma 4 years, 8 months ago
- 2 answers
Pushp Sharma 4 years, 8 months ago
Buddhabhushan Waghmare 4 years, 8 months ago
Posted by Tanya Singh 4 years, 8 months ago
- 1 answers
Gaurav Seth 4 years, 8 months ago
1. Adding toxic chemicals to water bodies, such as adding chemical wastes that contain harmful things such as pesticides, insecticides, is lethal for marine life.
2. For example, removing beneficial substances from water bodies depleting dissolved oxygen and nutrients this has adverse effects on aquatic life.
3. Shift of water temperature of bodies of water. To survive in those temperature levels the marine animals are adopted. A sudden change in temperature may affect aquatic animal breeding, their eggs and larvae etc. For starters, pouring cold water from dams adversely affects the aquatic life.
Posted by Tanya Singh 4 years, 8 months ago
- 1 answers
Gaurav Seth 4 years, 8 months ago
- Industrialisation has led to increased pollution of air in following ways:
- Due to industrialisation, the consumption of fossil fuels has increased. Combustion of fossil fuels has increased production of gases like CO, S02, S03, N02 and C02 which are toxic.
- There has been depletion in the ozone layer because of increase in the production of chemicals like chlorofluorocarbons which are used as insulators, refrigerants, solvents and aerosol propellants. This has resulted in the entry of UV rays into Earth’s atmosphere, which has affected various organisms.
- Combustion of fossil fuels also increases the amount of suspended particles in air causing pollution.
Steps taken to check air pollution are:
- Planting more trees, as they purify air by intake of COa gas and release of 02. This will reduce the greenhouse effect.
- Reducing the consumption of fossil fuels.
- Paying emphasis on the use of non-conventional sources of energy like wind energy, solar energy, tidal energy, etc., which reduce pollution to great extent.<button aria-label="like this post" title="like this post">
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</nav> </section> </article>Posted by Neshok Ls 4 years, 8 months ago
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Yogita Ingle 4 years, 8 months ago
| Balanced forces | Unbalanced forces |
| If a set of forces acting on a body produce no acceleration in it, then forces are said to be balanced. | If a set of forces acting on a body produces some non zero acceleration, forces are said to be unbalanced. |
| e.g. When we try to push a heavy box and it does not move, the force applied by us is balanced by the friction force acting on the box by the ground. | e.g. When we drag a box on the floor, there is an unbalanced force acting on the box. |
Posted by Neha Barthwal 1 year, 8 months ago
- 1 answers
Yogita Ingle 4 years, 8 months ago
Let v be the velocity of the girl on the cart as the cart starts moving.
The total momenta of the girl and cart before the interaction = (50 x 5 m s-1) + (4 x 0 m s-1)
= 250 kg m s-1
The total momenta after the interaction = (50 + 4) kg x v m s-1
= 54 v kg m s-1
According to the law of conservation of momentum,
Total momentum before the interaction = Total momentum after the interaction
→ 54 v = 250
v = 250/54 = 4.62 m/s
Posted by Deep Chandak 4 years, 8 months ago
- 5 answers
Jaskirat Singh 4 years, 8 months ago
Gaurav Seth 4 years, 8 months ago
Albert Einstein was really a scientific genius. He felt at home in Mathematics but he showed keen interest in physics. After graduating from the university in Zurich he started working vigorously. With his university education he was working on relativity.
Yogita Ingle 4 years, 8 months ago
Albert Einstein was born on 14th March in 1879, in the German city of Ulm. Till the age of two and half years, he could not speak and when he started speaking, he spoke every word twice. His playmates considered him to be boring and his mother thought that he was crazy because of the abnormally large size of his head.
Posted by Ansh Salaria 4 years, 8 months ago
- 1 answers
Gaurav Seth 4 years, 8 months ago
The Mass per cent formula is expressed as solving for the molar mass also for the mass of each element in 1 mole of the compound. You can determine the mass percentage of each element with these masses.
Posted by Satyam Kumar 4 years, 8 months ago
- 1 answers
Gaurav Seth 4 years, 8 months ago
Following are the formula of projectile motion which is also known as trajectory formula:
Where,
- Vx is the velocity (along the x-axis)
- Vxo is Initial velocity (along the x-axis)
- Vy is the velocity (along the y-axis)
- Vyo is initial velocity (along the y-axis)
- g is the acceleration due to gravity
- t is the time taken
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Yogita Ingle 4 years, 8 months ago
Involuntary muscle (or smooth muscle) is innervated by the autonomic nervous system and therefore is not under conscious control. It is not striated - rather, muscle cells contain small bundles of actin and myosin. It is found in the walls of the intestine, the iris, the walls of arteries and the walls of the uterus and cervix. Involuntary muscle contracts slowly but tires very slowly.
Voluntary muscle is responsible for causing movements of the skeleton at joints. It is innervated by the somatic nervous system. Voluntary muscle is striated and contracts quickly and powerfully but tires quickly.
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