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Ask QuestionPosted by Khushbu Shoeran 4 years, 11 months ago
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Posted by Khushbu Shoeran 4 years, 11 months ago
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Gaurav Seth 4 years, 11 months ago
| Homogeneous mixture | Heterogeneous mixture |
| (I) Homogeneous mixtures have uniform composition throughout the mixture. (II) The whole mixture is in same phase. (III) Components are not visible to the naked eye. (IV) Components cannot be separated easily. Eg.: Sugar + Water → Sugar solution |
(I) Heterogeneous mixture have composition which may vary from point to point. (II) Substances can be of two phases and layers may separate. (III) Component of mixture can be seen easily. (IV) Components can be separated easily. Eg.: Salt + Sand |
Posted by Khushbu Shoeran 4 years, 11 months ago
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Yogita Ingle 4 years, 11 months ago
Properties of Suspension
- Suspensions are a heterogeneous mixture of two or more substances.
- Particles of the solute do not dissolve in the solvent rather they remain suspended in bulk throughout.
- The size of particles of suspension is large enough to be visible from naked eyes. They are greater than 1 nanometer (?10?^(-9) meter).
- It shows Tyndall effect because of their large size of particles.
- When it is left for some time, particles get settled in the bottom. Therefore, it is not stable.
- The particles in it can be separated through the process of filtration.
Posted by Khushbu Shoeran 4 years, 11 months ago
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Yogita Ingle 4 years, 11 months ago
Functions of the stomata
- They allow the exchange of gases (CO2 and O2) with the atmosphere.
- Evaporation of water from the leaf surface occurs through the stomata. Thus, the stomata help in the process of transpiration.
- Based on the climatic conditions, it closes or opens its pores to maintain the moisture balance.
- Allows the intake of carbon dioxide and to give out oxygen during the process of photosynthesis.
- Stomata remains open during the day and closed at night. This closure at night prevents water from escaping through open pores.
Posted by Khushbu Shoeran 4 years, 11 months ago
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Yogita Ingle 4 years, 11 months ago
- The stacks of flattened membranous vesicles are called Golgi apparatus.
- It basically stores, packs and modifies the products in vesicles.
- It temporarily stores protein that moves out of the cell through the vesicles of the Golgi apparatus.
- It packs and transports the materials synthesised in Endoplasmic Reticulum to different targets inside and outside the cell.
Posted by Khushbu Shoeran 4 years, 10 months ago
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Yogita Ingle 4 years, 11 months ago
lasma membrane called a selectively permeable membrane because it regulates the movement of substances from within to outside of the cell. This means that the plasma membrane allows the entry of some substances while preventing the movement of some other substance
Posted by Aadya Singh 4 years, 11 months ago
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Aniket Yadav 4 years, 11 months ago
Posted by Divyanshi Agrawal 4 years, 11 months ago
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Gaurav Seth 4 years, 11 months ago
Blood is a fluid connective tissue that consists of plasma, blood cells and platelets. It circulates throughout our body delivering oxygen and nutrients to various cells and tissues. It makes up 8% of our body weight. An average adult possesses around 5-6 litres of blood.
Blood is responsible for the following body functions:
Fluid Connective Tissue
Blood is a fluid connective tissue composed of 55% plasma and 45% formed elements including WBCs, RBCs, and platelets. Since these living cells are suspended in plasma, blood is known as a fluid connective tissue and not just fluid.
Provides oxygen to the cells
Blood absorbs oxygen from the lungs and transports it to different cells of the body. The waste carbon dioxide moves from the blood to the lungs and exhaled.
Transports Hormone and Nutrients
The digested nutrients such as glucose, vitamins, minerals, and proteins are absorbed into the blood through the capillaries in the villi lining the small intestine.
The hormones secreted by the endocrine glands are also transported by the blood to different organs and tissues.
Homeostasis
Blood helps to maintain the internal body temperature by absorbing or releasing heat.
Blood Clotting at Site of Injury
The platelets help in the clotting of blood at the site of injury. Platelets along with the fibrin form clot at the wound site
Transport of waste to the Kidney and Liver
Blood enters the kidney where it is filtered to remove nitrogenous waste out of the blood plasma. The toxins from the blood are also removed by the liver.
Protection of body against pathogens
The White Blood Cells fight against infections. They multiply rapidly during the infections.
Posted by C Abbi 4 years, 11 months ago
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Posted by Tanu Shree 4 years, 11 months ago
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Yogita Ingle 4 years, 11 months ago
| <center>Proton</center> | <center>Neutron</center> | <center>Electron</center> |
| They are positively charged | They are neutral | They are negatively charged |
| They are present in the nucleus of all atoms | They are present in the nucleus of all atoms except hydrogen | They are present in the outer shells within an atom and orbit the positively charged nucleus in well-defined orbits |
| The mass of the proton is taken as one unit and equals the mass of a neutron | The mass of the neutron is considered as one unit and it equals the mass of a proton | The mass of an electron is about 1/2000 times the mass of a hydrogen atom |
| A proton is represented as “p” | A neutron is represented as “n” | An electron is represented as “e” |
Posted by Shyam Tomar 4 years, 11 months ago
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Aniket Yadav 4 years, 11 months ago
Gaurvendra Singh 4 years, 11 months ago
Gaurvendra Singh 4 years, 11 months ago
Posted by Neha Barthwal 4 years, 11 months ago
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Gaurvendra Singh 4 years, 11 months ago
Yogita Ingle 4 years, 11 months ago
The Universal Law of Gravitation states that every particle attracts every other particle in the universe with a force that is directly proportional to the product of the masses and inversely proportional to the square of the distance between them.
Devesh Godara 4 years, 11 months ago
Posted by Parvathy Roshan 4 years, 11 months ago
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Gaurvendra Singh 4 years, 11 months ago
Devesh Godara 4 years, 11 months ago
Neha Barthwal 4 years, 11 months ago
Posted by Sweta Soreng 4 years, 11 months ago
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Beyon P Binoy 4 years, 11 months ago
Neha Barthwal 4 years, 11 months ago
Yogita Ingle 4 years, 11 months ago
a=2m/s
u = 10 m/s, t = 5 sec
v = u + at
v= 10+2×5
v = 20m/sec
Posted by Sweta Soreng 4 years, 11 months ago
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Devesh Godara 4 years, 11 months ago
Posted by Sweta Soreng 4 years, 11 months ago
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Yogita Ingle 4 years, 11 months ago
distance = 2 km
total time = 30 min = 0.5 hour
initial speed = 3km/h for first 1 km
Hence time taken = distance/speed = 1/3 h
time left = 0.5 - 1/3 = 0.5/3 h
distance left = 1 km
Hence speed at which he should walk the second km wouldeb 1/(0.5/3) = 6 km/h
Posted by Sweta Soreng 4 years, 11 months ago
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Yogita Ingle 4 years, 11 months ago
Average speed of first
distance = 20 km
speed = 40 km/h
time taken = 20/40 = 1/2 hrs
2nd time average
distance = 20 km
speed = 60 km/h
time taken by the car is = 20/60 = 1/3 hrs
total time taken = t1+t2 = 1/2 +1/3 = 5/6 hrs
Average speed of the car is = (20+20)/(5/6)
= 48 km/h
Posted by Sweta Soreng 4 years, 11 months ago
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Yogita Ingle 4 years, 11 months ago
distance 1 = 10 m
distance 2 = 10 m
time 1 = 2 min = 2×60 = 120 s
time 2 = 3 min = 3×60 = 180 s
Average speed
= (10+10)/(120+180)
= 20/300
= 1/15 m/s
Posted by Sweta Soreng 4 years, 11 months ago
- 1 answers
Yogita Ingle 4 years, 11 months ago
The train's maximum speed= 80 km/hr
Average speed = total distance travelled
total time taken
The train's average speed= 400km = 40km/hr
10 hours
ratio of maximum speed to average speed= maximum speed : average speed
80km/hr : 40km/hr
2:1
= 2:1
Posted by Sweta Soreng 4 years, 11 months ago
- 1 answers
Yogita Ingle 4 years, 11 months ago
Time = 8 hours
distance = 320 km
average speed = total distance covered/ total time taken
= 320/8
= 40
so, the average speed of the bus is 40km/h
Posted by Sweta Soreng 4 years, 11 months ago
- 1 answers
Yogita Ingle 4 years, 11 months ago
D1 = 7.5×2/60= 0.25km
D2= 7.5×2/60= 0.25km
Total Distance= 0.25+0.25=0.50km
Total time taken = 2+2+56=60min= 1 HR
Average speed =total distance/ total time
Average speed= 0.50/1= 0.50 km/hr
Posted by Tanu Shree 4 years, 11 months ago
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Yogita Ingle 4 years, 11 months ago
Carbon dioxide, a waste product, passes across the epithelium of the alveoli to be removed from the body. Striated, columnar and cuboidal epithelium is absent in the lines of alveoli.
Posted by Balpreet Saini 4 years, 11 months ago
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Neha Barthwal 4 years, 11 months ago
Posted by C Abbi 4 years, 11 months ago
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Neha Barthwal 4 years, 11 months ago
Yogita Ingle 4 years, 11 months ago
One mole of molecule or ion refers to the quantity in number possessing a mass equal to its atomic or molecular mass in grams. Number of particles present in one mole of any substance is 6.022 X 1023. This value is called Avogadro number.
So we get 1 mole = 6.022 X 1023 in number.
Posted by Gayatri Anne 4 years, 11 months ago
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Posted by Tanu Shree 4 years, 11 months ago
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Yogita Ingle 4 years, 11 months ago
Squamous epithelium is made up of large flat cells whose edges are fit together like tiles in a floor. Due to their tile like appearance, they are also known as pavement epithelium.
Posted by Dikshant Bansal 4 years, 11 months ago
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Yogita Ingle 4 years, 11 months ago
Yes, we can find differences in cells from various parts of the plant body. There are different types of cells in a plant body. They have different structures and perform different functions. So, root cells would differ from the types of cells present in leaves or stem. For example: Leaf contains a number of different cells like mesophyll cells, bundle-sheath cells, guard cells which are not present in other parts of plant body.
Posted by Anushka Rawat 4 years, 11 months ago
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Jyoti Kjha 4 years, 11 months ago
Posted by Utkarsh Singh Parihar 4 years, 11 months ago
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Yamini Kandpal 4 years, 11 months ago
Yogita Ingle 4 years, 11 months ago
imple tissues are of three types namely parenchyma, collenchyma and sclerenchyma.
- Parenchyma – They are living cells and walled, soft in nature due to the presence of thin-walled cells
- Collenchyma – These are characterized by uneven thick-walled living cells.
- Sclerenchyma – They have cells with thickened lignified walls, providing them strength and making them waterproof.
Posted by Divya Upadhyay 4 years, 11 months ago
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Gaurav Seth 4 years, 11 months ago
The shape and size of cell depends on the function it performs. For example, RBCs are designed in such a way that they have to carry oxygen in the bound form with haemoglobin. Nucleus occupies adequate space in the cell. So, RBCs do not have nucleus in order to accommodate more haemoglobin to carry oxygen.
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Gaurav Seth 4 years, 11 months ago
A n s w e r:
Solubility is the number of grams of the solute that will dissolve in 100 g of the solvent. So as temperature increases due to that the kinetic energy and solubility of salt molecules increases.
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