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Ask QuestionPosted by Shruti Agrawal 4 years, 4 months ago
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Posted by Yatharth Ahuja 4 years, 4 months ago
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Meghna Thapar 4 years, 4 months ago
Digestion of carbohydrates, fats and proteins:
(i) Carbohydrates - The digestion of carbohydrates begins in the mouth. The human saliva contains an enzyme called salivary amylase which digests the starch present in the food into maltose sugar. The slightly digested carbohydrates when reaches the small intestine, pancreatic amylase present in the pancreatic juice breaks down the starch. The intestinal juice of the small intestine completes the digestion of carbohydrates and finally coverts it into glucose.
(ii) Fats - The process of digestion of fats begins in the stomach. The glands of stomach secrete a small amount of gastric lipase that breaks down the fats present in the food. From the stomach the partially digested food goes into small intestine where the pancreatic lipase breaks down the emulsified fats. The walls of small intestine secrete intestinal juice which converts the fats into fatty acids and glycerol.
(iii) Proteins - The digestion of proteins begins in the stomach. The glands of the stomach secrete gastric juice which contains an enzyme called pepsin. Pepsin converts the proteins into peptones. Pancreatic juice contains trypsin which digests the proteins into peptides and the intestinal juice completes the process of digestion of proteins thus converting it into amino acids.
Posted by Insha Fatima 4 years, 4 months ago
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Yogita Ingle 4 years, 4 months ago
Aqua regia (Latin: royal water) is a mixture of nitric acid(HNO3) + maximum concentrated hydrochloric acid (33%) in a volume ratio of 1:3 respectively.
As it can dissove royall metals Or noble metals i.e. gold and platinum it is called royal water.
Posted by Ritik Varshney 4 years, 4 months ago
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Sana Parween 4 years, 4 months ago
Posted by Nikhil Malik 4 years, 4 months ago
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Posted by Ankur Bansal 4 years, 4 months ago
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Insha Fatima 4 years, 4 months ago
Mritunjay Rai 4 years, 4 months ago
Minakshi Panda 4 years, 4 months ago
Posted by Vansh Kochhar 4 years, 4 months ago
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Astha Bharti 4 years, 4 months ago
Gaurav Seth 4 years, 4 months ago
1. Boiling is vaporisation of liquid into gas due to continuous heating. Most of the time it is not a natural process.Evaporation on the other hand is a natural process and it is similar to boiling , but the liquid form changes into gaseous form when there is a increase in either temperature or pressure or both.
2. Boiling happens when the temperature reaches to the boiling point. In Evaporation the temperature does not need to reach to boiling point
3.
| Bubble formation is visible | Where as Bubbles do not form in evaporation |
Posted by Yashi ?? 4 years, 4 months ago
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Meghna Thapar 4 years, 4 months ago
The cells of the human body have different shapes and sizes.
The shape and size of cells are related to the specific function they perform. Some cells like Amoeba have changing shapes which helps in its locomotion. The shape of the cell may be variable like white blood cells. Fixed shape of cell occurs in most plants and animals.
The size of different cells ranges between broad limits. Some plant and animal cells are visible to the naked eye however, some are microscopic.
Each living cell has the capacity to perform certain basic functions that are characteristic of all living forms. There is a division of labour in multicellular organisms such as human beings. Different parts of the body perform different functions like the human body has a heart to pump blood and stomach to digest food. Similarly, division of labour is also seen within a single cell. Each cell has got certain specific components within it known as cell organelles which perform a special function such as making new material in the cell, clearing up the waste material from the cell.
Posted by Danish Bisht 4 years, 4 months ago
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Posted by Lalitha Shree Sathyanarayanan 4 years, 4 months ago
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Posted by Sneha Jha 4 years, 4 months ago
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Insha Fatima 4 years, 4 months ago
Posted by Ashish Vaishnav 4 years, 4 months ago
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Insha Fatima 4 years, 4 months ago
Mahi Gautam 4 years, 4 months ago
Gaurav Seth 4 years, 4 months ago
Matter is anything which has mass, occupies space and can be percieved by our senses.
Example: Air, Book.
Posted by Sunita Gangwar 4 years, 4 months ago
- 3 answers
Yogita Ingle 4 years, 4 months ago
Pure substances are substances that are made up of only one kind of particles and has a fixed or constant structure.
Pure substances are further classified as elements and compounds.
An element is a substance that consists of only one type or kind of atom. An element is a pure substance as it cannot be broken down or transformed into a new substance even by using some physical or chemical means. Elements are mostly metals, non-metals or metalloids.
Ranjan Satpathy 4 years, 4 months ago
Posted by Shabd Kumar 4 years, 4 months ago
- 2 answers
Yogita Ingle 4 years, 4 months ago
When the acceleration is constant (positive), and the initial velocity of the particle is zero, the velocity of the particle will increase linearly as predicted by the equation:
v = u + at
Since u = 0
v = at
As shown in the figure, the velocity of the particle will increase linearly with respect to time. The slope of the graph will give the magnitude of acceleration.
Example: If the acceleration of a particle is constant (k) and is positive, the initial velocity is zero, and then the velocity increases linearly. The slope of the velocity-time graph will give the acceleration.
Ranjan Satpathy 4 years, 4 months ago
Posted by Pawan Sahu 4 years, 4 months ago
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Yogita Ingle 4 years, 4 months ago
| Plant cells | Animal cells |
| 1. Plant cells are rectangular and larger than animal cells. | 1. Animal cells are mostly round/oval and smaller than plant cells. |
| 2. Cellulose cell wall is makes the outer most boundary. | 2. Animal cells lack cell wall. |
| 3. A mature plant cell has single, large, well developed vacuole.. | 3. Mostly absent, if present, they are small and scattered. |
| 4. Golgi bodies components are diffused all over the cell and make dictyosomes. | 4. Well developed Golgi bodies are present near the nucleus. |
| 5. Centrioles and centrosomes are absent; rather polar caps are present. | 5. Centrioles and centrosomes are present. |
| 6. Plant cells have plastids. | 6. Plastids are absent. |
| 7. Starch or oil serve as storage food material. | 7. Glycogen serves as storage food material. |
Posted by Mahaveer Sahani 4 years, 4 months ago
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Theertha S 4 years, 4 months ago
Posted by Nikhil Rajput 4 years, 4 months ago
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Ranjan Satpathy 4 years, 4 months ago
Gaurav Seth 4 years, 4 months ago
# Given -
m = 500 g = 0.5 kg
u = 200 cm/s = 2 m/s
v = 0.2 m/s
# Solution -
Initial momentum of the object is -
pi = m.u
pi = 0.5 × 2
pi = 1 kgm/s
Final momentum of the object is -
pf = m.v
pf = 0.5 × 0.2
pf = 0.1 kgm/s
Change in momentum is calculated by -
∆p = pf - pi
∆p = 0.1 - 1
∆p = -0.9 kgm/s
Hence, change in momentum of object is -0.9 kgm/s.
Posted by Jigyasha Kumari 4 years, 4 months ago
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Insha Fatima 4 years, 4 months ago
Gaurav Seth 4 years, 4 months ago
- Genes control the functions of DNA and RNA.
- Proteins are the most important materials in the human body which not only help by being the building blocks for muscles, connecting tissue and skin but also takes care of the <a href="https://byjus.com/biology/enzymes/">enzymes</a> production.
- These enzymes play an important role in conducting various chemical processes and reactions within the body. Therefore, protein synthesis is responsible for all activities carried on by the body and are mainly controlled by the genes.
- Genes consist of a particular set of instructions or specific functions. For example, globin gene was instructed to produce haemoglobin. Haemoglobin is a protein that helps to carry oxygen in the blood.
Posted by Md Alkaishar Quraishi 4 years, 4 months ago
- 2 answers
Insha Fatima 4 years, 4 months ago
Gaurav Seth 4 years, 4 months ago
Rest and motion are the relative terms because they depend on the observer's frame of reference.
If an observer is at rest in his or her own frame of reference , but he may be moving in other observer's frame of reference. So if two different observers are not at rest with respect to each other, then they too get different results when they observe the motion or rest of a body.
Posted by Nishihoney Lodha 4 years, 4 months ago
- 1 answers
Gaurav Seth 4 years, 4 months ago
UV rays, either from the sun or from artificial sources like tanning beds, can cause sunburn. Exposure to UV rays can cause premature aging of the skin and signs of sun damage such as wrinkles, leathery skin, liver spots, actinic keratosis, and solar elastosis. UV rays can also cause eye problems
When light hits an object, some is absorbed and some are reflected. Their ability to see ultraviolet light gives them an advantage when seeking nectar. Many patterns on flowers are invisible to humans. These nectar “bulls-eyes” are visible only to animals, such as bees, that have the ability to see ultra-violet light.
Posted by Shreshtha Chaudhary 4 years, 4 months ago
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Shabd Kumar 4 years, 4 months ago
Nishihoney Lodha 4 years, 4 months ago
Aanchal Chaudhary 4 years, 4 months ago
Posted by Archana Raj 4 years, 4 months ago
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Posted by Ajay Singh 4 years, 4 months ago
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Insha Fatima 4 years, 4 months ago
Ajay Singh 4 years, 4 months ago
Posted by Russia Thokchom 4 years, 4 months ago
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Posted by Amrit Murti 4 years, 4 months ago
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Yogita Ingle 4 years, 4 months ago
Social anxiety disorder (SAD), also known as social phobia, is an anxiety disorder characterized by sentiments of fear and anxiety in social situations, causing considerable distress and impaired ability to function in at least some aspects of daily life.
Posted by Ritik Varshney 4 years, 4 months ago
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Yogita Ingle 4 years, 4 months ago
Acceleration is defined as the rate of change of velocity and is an example of a vector quantity. Following are the types of acceleration:
- Uniform acceleration: When an object is travelling in a straight line with an increase in velocity at equal intervals of time, then the object is said to be in uniform acceleration. Free falling of an object is an example of uniform acceleration.
- Non-uniform acceleration: When an object is travelling with an increase in velocity but not at the equal intervals of time is known as non-uniform acceleration. Bus moving or leaving from the bus stop is an example of non-uniform acceleration.
- Instantaneous acceleration: Acceleration of an object at any instant of time is known as instantaneous acceleration.
Posted by Ram Mehta 4 years, 4 months ago
- 3 answers
Aanchal Chaudhary 4 years, 4 months ago
Yogita Ingle 4 years, 4 months ago
Matter is anything that is made of atoms and molecules which has mass and occupies space. Based on physical status it is classified into three types namely solids, liquids and gases. Solids have definite shape, volume.
Posted by Ankit Kumar Sharma Sharma 4 years, 4 months ago
- 2 answers
Insha Fatima 4 years, 4 months ago
Yogita Ingle 4 years, 4 months ago
A mole is defined as the amount of a substance that contains exactly 6.02214076 * 1023 ‘elementary entities’ of the given substance.
Number of Moles = (Mass of the Sample)/(Molar Mass)
1 amu = (1gram)/(6.022*1023) = 1.66*10-24 grams
Posted by Naveen Gow 4 years, 4 months ago
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Meghna Thapar 4 years, 4 months ago
The size of the particles which make up matter are very, very small. This can be shown by performing the given experiment:
i. Take 2-3 crystals of potassium permanganate and dissolve them in 100 mL of water.
ii. Take out approximately 10 mL of this solution and put it into 90 mL of clear water.
iii. Take out 10 mL of this solution and put it into another 90 mL of clear water.
iv. Keep diluting the solution like this 5 to 8 times.
This experiment shows that just a few crystals of potassium permanganate can colour a large volume of water (about 1000 L). So we conclude that there must be millions of tiny particles in just one crystal of potassium permanganate, which keep on dividing themselves into smaller and smaller particles.
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Yogita Ingle 4 years, 4 months ago
Intermolecular forces are the forces of attraction between the molecules of a gas.
The strength of the intermolecular forces is affected by change in temperature and pressure.
High pressure brings the molecules of a gas together and hence increases the strength of the intermolecular forces.
As the pressure increases the molecules of the gas come closer together and finally form a liquid.
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