CELL ( 18 april 2016 )
Water from cucumber comes iout when we add salt to it ?
Water from cucumber comes iout when we add salt to it ?
the cells of the cucumber have low salt content while the water around it has high salt content . therefore , to maintain a balance water comes out of the cucumber . this process is called osmosis
MATTER IN OUR SURROUNDINGS ( 4 april 2016 )
we observe that the level of salt does not change even after dissolving of salt in it because the particles of salt get into the spaces between the particles of water .
PROPERTIES OF PARTICLES (5 april 2016 )
properties of particles
1 these are very small
2.these posses kinetic energy
3. these have space between them
GIVE REASONS (7 april 2016 )
table is hard : this is because table is solid and so its particpes are tightly packed together .
the smell of hot sizzling food reaches our nose : this is because the particles of the smell of food get into the particles of air and travel very fast because particles posses kinetic energy faster in high temperature .
LATENT HEAT ( 13 april 2016 )
Latent heat of fusion : the heat required to change 1 kg of solid to liquid completely is known as latent heat of fusion .
Latent heat of vapourisation : the heat required to change one kg of liquid into vapours at atmospheric pressure.
EXERCISES cell date : 7 april 2016
1. Difference between plant and animal cell
Plant cell animal cell
Cell wall is present cell wall is absent
Plastids are present plastids are absent . 4 . What would happen if there is no Golgi apparatus ?
Golgi apparatus has a function of storage modific
ation and packaging . so , if there is no golgi apparatus , then the packaging and transporting of materials will not happen .
5. Which part of cell is known as powerhouse of cell and why ?
Mitochondria is known as powerhouse of cell as it provides energy for performing different chemical activities .
6. Where do lipids and protiens constituting plasma membrane get synthesised ?
Endoplasmic reticulum
8 . what is osmosis ?
the tendency of a fluid, usually water, topass through a semipermeablemembrane into a solution where thesolvent concentration is higher, thusequalizing the concentrations of materials on either side of themembrane.
2. Difference between Prokaryotic and eukaryotic cells
Prokaryotic cells
1 primitive nucleus not bounded by nucleur membrane .
2 size of cell is small
3membrane bound organelles are absent
Eukaryotic cells
1the nucleus bounded by nucleau membrane
2 size is large
3 . membrane bound organelles are present
MATTER IN OUR SURROUNDINGS ( 4 april 2016 )
we observe that the level of salt does not change even after dissolving of salt in it because the particles of salt get into the spaces between the particles of water .
PROPERTIES OF PARTICLES (5 april 2016 )
properties of particles
1 these are very small
2.these posses kinetic energy
3. these have space between them
GIVE REASONS (7 april 2016 )
table is hard : this is because table is solid and so its particpes are tightly packed together .
the smell of hot sizzling food reaches our nose : this is because the particles of the smell of food get into the particles of air and travel very fast because particles posses kinetic energy faster in high temperature .
LATENT HEAT ( 13 april 2016 )
Latent heat of fusion : the heat required to change 1 kg of solid to liquid completely is known as latent heat of fusion .
Latent heat of vapourisation : the heat required to change one kg of liquid into vapours at atmospheric pressure.
EXERCISES cell date : 7 april 2016
1. Difference between plant and animal cell
Plant cell animal cell
Cell wall is present cell wall is absent
Plastids are present plastids are absent . 4 . What would happen if there is no Golgi apparatus ?
Golgi apparatus has a function of storage modific
ation and packaging . so , if there is no golgi apparatus , then the packaging and transporting of materials will not happen .
5. Which part of cell is known as powerhouse of cell and why ?
Mitochondria is known as powerhouse of cell as it provides energy for performing different chemical activities .
6. Where do lipids and protiens constituting plasma membrane get synthesised ?
Endoplasmic reticulum
8 . what is osmosis ?
the tendency of a fluid, usually water, topass through a semipermeablemembrane into a solution where thesolvent concentration is higher, thusequalizing the concentrations of materials on either side of themembrane.
2. Difference between Prokaryotic and eukaryotic cells
Prokaryotic cells
1 primitive nucleus not bounded by nucleur membrane .
2 size of cell is small
3membrane bound organelles are absent
Eukaryotic cells
1the nucleus bounded by nucleau membrane
2 size is large
3 . membrane bound organelles are present
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