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Ask QuestionPosted by Sanchita ?? 4 years, 10 months ago
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Posted by Anshu Sheryar Anshusheryar 4 years, 10 months ago
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Sanchita ?? 4 years, 10 months ago
Posted by Sanchita ?? 4 years, 10 months ago
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Manyata Joshi 4 years, 10 months ago
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Gaurav Seth 4 years, 10 months ago
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Distillation |
Fractional Distillation |
| Distillation is a process used to separate liquids with boiling points which comprise gaps around 50 degrees at least. | Fractional Distillation is a process used to separate liquids with closer boiling points |
| Simple distillation will have only one cycle of distillation i.e vaporization-condensation throughout the process. | The fractional distillation will have at least two cycles. |
| The experimental set up is simple. Needs a simple apparatus with two simple flasks and a condenser | The experimental set up is complex. We need a complex apparatus with a fractioning column. |
| Used in the purification of seawater | Used in crude oil refining |
Posted by Pankhuri Sharma 4 years, 10 months ago
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Gaurav Seth 4 years, 10 months ago
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Mitosis |
Meiosis |
Interphase |
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| Each chromosome replicates. The result is two genetically identical sister chromatids | Chromosomes not yet visible but DNA has been duplicated or replicated |
Prophase |
|
| Prophase –Each of the duplicated chromosomes appears as two identical or equal sister chromatids, The mitotic spindle begins to form. Chromosomes condense and thicken | Prophase I – crossing-over recombination – Homologous chromosomes (each consists of two sister chromatids) appear together as pairs. Tetrad is the structure that is formed. Segments of chromosomes are exchanged between non-sister chromatids at crossover points known as chiasmata (crossing-over) |
Metaphase |
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| Metaphase -The chromosomes assemble at the equator at the metaphase plate | Metaphase I Chromosomes adjust on the metaphase plate. Chromosomes are still intact and arranged as pairs of homologues |
Anaphase |
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| Anaphase – The spindle fibres begin to contract. This starts to pull the sister chromatids apart. At the end of anaphase, a complete set of daughter chromosomes is found each pole | Anaphase I Sister chromatids stay intact. However, homologous chromosomes drift to the opposite or reverse poles |
Posted by Haripriya Jena 4 years, 10 months ago
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Gaurav Seth 4 years, 10 months ago
Physical Changes
- The changes in which no new substance is formed are called physical changes.
- The molecular composition remains totally same.
- For example, the molecular composition of ice and water is not changed.
- The energy needed to bring a physical change is equal to the amount of energy required to reverse the change. There is no change in energy.
- The changes are reversible and temporary. The reaction gets reversed if the cause producing the change is removed. For example, water on freezing forms ice and ice on melting forms water.
- Examples of physical change
- Dissolution of sugar in water
- Melting of ice
- Freezing of water
- Boiling of water
- Melting of wax
Posted by Pankhuri Sharma 4 years, 10 months ago
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Meghna Thapar 4 years, 10 months ago
Most of the time when people refer to “cell division,” they mean mitosis, the process of making new body cells. Meiosis is the type of cell division that creates egg and sperm cells. ... During mitosis, a cell duplicates all of its contents, including its chromosomes, and splits to form two identical daughter cells. Mitosis is a process of nuclear division in eukaryotic cells that occurs when a parent cell divides to produce two identical daughter cells. During cell division, mitosis refers specifically to the separation of the duplicated genetic material carried in the nucleus. In meiosis, prophase, metaphase, anaphase and telophase occur twice. The first round of division is special, but the second round is more like mitosis. In mitosis, prophase, metaphase, anaphase and telophase occur once. Chromosomes condense and the centrosomes begin to form an early spindle.
Posted by Purav Mehta 4 years, 10 months ago
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Ananya K 4 years, 10 months ago
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Somay Mamgain 4 years, 10 months ago
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Posted by Naina Sahu 4 years, 10 months ago
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Yogita Ingle 4 years, 10 months ago
Distance covered by the satellite in 24 hours
s=2πr
=2×3.14×42250=265464.58 km
Therefore speed of satellite,
v = distance travelled/ time taken = 265464.58/ (24×60×60) =3.07 km /s
Posted by Dêv!! Bhai!! 4 years, 10 months ago
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Dipanshu Marodia 4 years, 10 months ago
Gaurav Seth 4 years, 10 months ago
Prokaryotic cell |
Eukaryotic cell |
| Prokaryotic cells are generally small in size. | Eukaryotic cells are comparatively larger in size. |
| The nuclear material is undefined having no nuclear membrane and is called nucleoid. | Nucleus having a nuclear membrane present. |
| A single chromosome is present. | More than one chromosome is present. |
| It does not contain membrane bound cell organelle. | It contains membrane bound cell organelles like mitochondria, plastids etc. |
| Ribosome is of 70s type. | Ribosome is 80s type. |
| Cell division takes place by fission or budding or fragmentation. | Cell division takes place by mitosis and meiosis |
Posted by Imran Fareedh 4 years, 10 months ago
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Posted by Varsha Keshari 4 years, 10 months ago
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Nandini Ladda 4 years, 10 months ago
Priyanshu Kumar Singh 4 years, 10 months ago
Anwesha Samantaray 4 years, 10 months ago
Manyata Joshi 4 years, 10 months ago
Manyata Joshi 4 years, 10 months ago
Posted by Atharv Moyal 4 years, 10 months ago
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Gaurav Seth 4 years, 10 months ago
In this change a new substance is formed, hence it is a Chemical change.
Adding lemon juice changes the acidity of tea.
Tea has polyphenol pigment 7−20% and on adding lemon juice which is acidic, hydrogen ions suppress the ionization of polyphenols and that changes the colour of tea making it lighter.
Therefore, change in the colour of black tea on adding lemon juice is an example of chemical change.
Posted by Priti Tyagi 4 years, 10 months ago
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Gaurav Seth 4 years, 10 months ago
The initial velocity of marble is 0.4m/s.
And the retardation is 0.2m/s²,or a=-0.2m/s²
Now by first equation of motion
v=u+at
where u is initial velocity,v is final velocity a is acceleration and t is time.
Putting the values in the equation,we get
0=0.4+(-0.2)t. (final velocity is 0 because body comes to rest.)
or,0.2t=0.4
or,t=0.4/0.2=2s
Posted by Shevani 123 4 years, 10 months ago
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Gaurav Seth 4 years, 10 months ago
Carbon and oxygen reacts in a ratio 3:8 by mass to form Carbon dioxide
Hence the required reaction is ;
C + O2 --> CO2
Carbon : Oxygen = 3 : 8
Due to law of constant proportion, the mass ratio in which the reactants will react will remain constant.
Carbon --> 9 g
Oxygen --> ?
C : O2 = 3:8
9 : O2 = 3:8
9/O2 = 3/8
Mass of oxygen required
= (9/3)×8
= 3×8
= 24 g
Posted by Prateek Paital 4 years, 10 months ago
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Bhumi Kumari 4 years, 10 months ago
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Posted by Naina Sahu 4 years, 10 months ago
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Kartik Kumar 4 years, 10 months ago
Posted by Naina Sahu 4 years, 10 months ago
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Somay Mamgain 4 years, 10 months ago
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Yogita Ingle 4 years, 10 months ago
It is difficult to pull out the husk of a coconut tree because it is made up of sclerenchyma tissues which are dead cells. This gives rigidity and stiffness.
Posted by Subhransu Sahoo 4 years, 10 months ago
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Manyata Joshi 4 years, 10 months ago
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Manyata Joshi 4 years, 10 months ago
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Abhinandan Dubey 4 years, 10 months ago
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