When oil glands secrets more it results in acne

Acne or acne vulgaris is a long term skin condition when hair follicles are clogged with dead skin cells and oil from skin. It is characterized by pimples, blackheads and possible scarring.

It affects areas of the skin with a relatively high number of oil glands , including the face, upper part of the chest, and back.

Genetics and bacterial infections are the main contributing factors for acne. It can be treated by medications such as benzoyl peroxide, retinoids, etc.

A body is said to be in motion when its position changes with respect to a stationary object taken as reference point.

diffusion is the process because copper sulphate mixes up in the water and the solution turns blue.

Milk can be most compressed because there is more space between the subatomic particles of milk in comparison of coalpowder and ice cream.

Because it is made up of more than two element.

Unicellular organisms are those organisms which made up of only one cells like amoeba and paramecium

Unicellular organisms means the organism contains one cell.like Ameoba

Yes, rubber band can be regarded as solid. A rubber band undergoes a change in shape on stretching i.e. on applying pressure. When the pressure is released, it regains its original shape. Such solids are known as elastics.

Esophagus is made of muscular tissue and cartilage ( connective tissue).

Pinns of ear is made up of cartilage a kind of connective tissue.

I do not agree with Payal ,displacement can be zero but distance and displacement can never be negative.

Displacement will be zero if the initial and final position of the object is same.

Yes, Displacement can be zero. Also it can be negative.

No, displacement can not be greater than distance because displacement is the short distance covered.

The egg white is about 12 percent protein and the egg yolk itself is about 16 percent protein. This means that any alteration to the structure of these proteins will, in turn, significantly alter the structure of the entire egg.

Denaturation is what happens when heat is applied to the eggs. Chemically, this is the process by which the chains of amino acids are changed from their original (or native) state.

The heat coming from your stove denatures the protein by disrupting some of its bonds that held the molecule into shape.

In the case of hard-boiled eggs, the proteins clump together and solidify, causing the egg white and yolk to harden.

If magnitude as well as direction of any quantity is defined then it is vector quantity

Its physical quantity having mag and dircn.

Mass is constant at every place but the weight of the body varies according to the place where the body is.

As we know liquid pressure increases with the increase in depth of the sea. So divers wear special diving suits to withstand such high pressure preventing their body to be crushed and they can breathe normal air inside water.

Because deep beneath the ocean ,the pressure increases which can push the divers back to the water surface level.So they wear a special dress which can withstand the pressure and move swiftly.

Fish are slightly more denser than the water in which they swim. They are almost neutrally buoyant causing it to float. As we know pressure increases with water depth causing counteract fluctuations by using bladder present in fish. The amount of oxygen in the bladder determines the fish buoyancy. When the fish decompose after death if oxygen remains in the bladder it floats and if water then they sink until the gases build.

Prokaryotic cells are very simple cells with fewer structures than eukaryotic cells; one primary difference is that they lack a nucleus. Bacteria are an example of prokaryotes.

Plant cell

density= {tex}mass\over volume {/tex}

Since mass is the same the only depended quantity is volume.

Cotton can be compressed a lot so its volume decreases and since density varies inversely with volume it will be the maximum in cotton.

(A) Gas jar A contains air while gas jar B conain bromine gas.

(B) intermixing of gas will take place.

(C) Diffusion

(D) chalk and water

it can be defined as the process in which the molecules from lower concentration to higher concentraion at standard condition.

Ans. A covalent bond, also called a molecular bond, is a chemical bond that involves the sharing of electron pairs between atoms. These electron pairs are known as shared pairs or bonding pairs, and the stable balance of attractive and repulsive forces between atoms, when they share electrons, is known as covalent bonding.

Naming binary (two-element) covalent compounds is similar to naming simple ionic compounds. The first element in the formula is simply listed using the name of the element. The second element is named by taking the stem of the element name and adding the suffix -ide.

Tangentially means touching the circular path at one point that is perpendicular to radius of the circle.

The following are the advantages ofbgraphs:

•  Instantaneous values of the velocity of the body at different periods of time can be found.
• The distance (displacement actually) travelled can be found easily by calculating the area below the graph.
• The acceleration can be found by slope of graph.

Ans.

• Gas is one of the 4 states of matter which are solid, liquid, gas and plasma, vapor does not classify as such. It is just a substance. it is gaseous form.
• Vapor can turn back and forth into liquid and solid states but a gas cannot
• Gases cannot be see while vapors are visible
• Vapors settle down on ground while gases do not

Ans. length of train = 100 m 

To pass a pole train ll cover the distance equal to its length

So distance cover by train = 100 m

Time taken = 5 s

Speed of train = {tex}distance \ cover \over time \ taken{/tex} = {tex}100 \over 5 {/tex} = 20 m/s

Total distance to cover to cross a bridge = length of bridge + length of train = 500 + 100 = 600 m

Speed = 20 m/s

time taken = {tex}distance \ cover \over speed{/tex} = {tex}600 \over 20 {/tex} =  30 s

Non-uniform Acceleration:- A body is said to have a non-uniform acceleration if its velocity increases by unequal amounts in equal intervals of time. Eg The speed or velocity of a car running on a crowded city road changes continuously.

The velocity-time graph of a body having uniform acceleration is a curved line.