Chapter-6 Q/Ans: 1.In which form carbohydrates are stored in plants and humans? 2.What happens to food in our stomach. 3.What is saliva.Write it's functions. 4.What is digestive enzymes.Write its functions. 5.What is the function of HCl and mucus. 6.How the length of small intestine varies in different organisms. 7.Explain the break-down of glucose by various pathways with the help of a diagram. 8.What is ATP?How is it formed? 9.Write a short note on exchange of respiratory gases in plants. 10.What is the role of rings in the cartilage. 11.What is plasma and it's functions. 12.Why there is a need to separate right side of blood from left side. 13.Write the function of Valves. 14.Why amphibians and reptiles have 3 chambered hearts? 15.Why proper transportation system is needed in plants? 16.Why humans need more complex transportation system than plants. 17.How is urine produced? 18.Which materials are reabsorbed during their passage to ureter? 19.What is lymph.Write it's functions. 20.Why fishes have higher breathing rate than humans? 21.Why we feel cramps after a heavy exercise. 22.Diff. b/w aerobic and anaerobic respiration.

Dear keep the fear

Madam! it's the ray diagram when the object is placed at center of curvature !

Magnesium ribbon should be cleaned before burning because *Magnesium is a reactive element if it is kept open in the air it reacts with oxygen in the atmosphere and form the layer of magnesium oxide which does not support in burning

A Magnesium ribbon should be cleaned before burning in air so as to remove the protective layer of basic Magnesium Carbonate from its surface, so that it may readily combine with the oxygen of air to form Magnesiun Oxide. ?HOPE IT WILL HELP U?

Magnesium ribbon should be cleaned with sandpaper before burning in the air because of the following reasons:

• Magnesium very reactive element which rapidly reacts with oxygen in the air to form a white layer of magnesium oxide and this layer will not burn.
• To remove the Magnesium oxide layer from the ribbon which may prevent or slow down the burning of
• magnesium ribbon.
• Unwanted impurities deposited on the magnesium ribbon can be removed and only pure magnesium can be used for the reaction

It should be cleaned because it is highly reactive with air or oxygen also, we due to this reason rup it with Magnesium Carbonate

Properties of elements are periodic function of there atomic Number???

IN this elements are arranged in order of their atomic number in ascending order

Law of Modern Periodic Table states that properties of elements are the periodic function of their atomic numbers. In the modern periodic table, elements are arranged in order of their increasing atomic numbers.

Explanation of Modern Periodic Table:

• Elements are arranged in order of their increasing atomic numbers.
• The vertical columns are known as groups and horizontal columns are known as periods; in the modern periodic table.
• There are 18 groups and 7 periods in the modern periodic table.

Groups in Modern Periodic Table:

1^st group: Alkali metals are placed in the 1st group in the modern periodic table. Hydrogen is also placed in the 1st group although hydrogen is not an alkali metal.

2^nd group: Alkaline earth metals are placed in the 2nd group in the modern periodic table.

Elements placed in 1st and 2nd groups in the modern periodic table are collectively known as light metals.

3^rd to 12^th group: Transition elements are placed from 3rd to 12th group in the modern periodic table.

13^th group: Metals are placed in the 13th group; except boron which is a metalloid.

14^th group: Carbon, silicon, germanium, tin and lead are placed in this group. Among them, carbon is a non-metal, silicon and germanium are metalloids and tin and lead are metals.

15^th group: Nitrogen, phosphorous, arsenic, antimony and bismuth are place in the 15th group; among which nitrogen and phosphorous are non-metals, arsenic and antimony are metalloids and bismuth is a metal.

16^th group: Oxygen, sulphur, selenium, tellurium and polonium are placed in this group, among which oxygen, sulphur and selenium are non-metals, tellurium is metalloid and polonium is a metal.

The rate of flow of charge is known as electric current. Si unit of electric current is ampere. Power,. The rate of doing work is known as power. Si unit is watt

Whereas power is the amount of work electricity can do in curcit it is measured in watt

Electric current is a rate of flow of electrons in a unit of time

3. 

Lime water is the solution of calcium hydroxide in water. When it is passed on with carbon dioxide gas, it turns the lime water milky due to the formation of a white precipitate of calcium carbonate.

The equation for the reaction of lime water and carbon dioxide follows:

Hence, the equation for this reaction is given above.

4. 

The equation for the combustion reaction of ethane can be written as:
2C2​H2​+5O2​→4CO2​+2H2​O

 

Potassium hydroxide is used in the experiment for the absorption of CO2 from the plant released during respiration. When KOH absorbs CO2, it creates a vacuum in the flask. The air present in the bent glass tube moves into the conical flask. This pulls the water in the bent tube further up. Carbon dioxide released by respiration of seeds will not be absorbed. So, partial vacuum will not be created and thus there will be no rise in the level of water in the glass tube. If moisture is not available, seeds will dry up and rate of respiration would fall.

100/9 cm

Hlo

Plas tell me

Myocote is also known as muscle cell. It is type of cell found in muscle tissue.

Photolysis of water means splitting of water into hydrogen and oxygen.

2H₂O  4H⁺ + 4e^- + oxygen

1. Hydrogen ions are used to reduce NADP to form NADPH.

2. Oxygen is given out as molecular oxygen.

3. Electrons are use to convert ADP to ATP by adding phosphate.

Addition of hydrogen to an unsaturated hydrocarbon in the presence of a catalyst to give a saturated hydrocarbon is called a hydrogenation reaction.

e.g. C₂H₄ + H₂  → C₂H₆

Hydrogenation is a chemical reaction between molecular hydrogen (H2) and another compound or element, usually in the presence of a catalyst such as nickel, palladium or platinum. The process is commonly employed to reduce or saturate organic compounds.

The loss of water in the form of water vapours from the aerial parts of plant is called transpiration.

Transpiration is a process were excess amount of water is evapourated by the stomata of the leaves

The process of loss of water through the stomata.

Transpiration is the evaporation of water into the atmosphere from the leaves and stems of plants. Mainly it occurs at the leaves while their stomata are open for the passage of CO₂ and O₂ during the process of photosynthesis.

Convert time into seconds

1×60×60= 3600 sec

using formula-

Q=I×t (charge= current×time)

charge = 0.2×3600= 720 C

Chemical change

chemical change

Combustion of Liquified Petroleum Gas (LPG) is a chemical change because, after its combustion, the new substance formed changes chemically and cannot be turned back into LPG.

1)The Ray diagram of case the object is at the centre of curvature of concave mirror is in the fig 1.         And the nature of the image is-         same size, inverted and real. 2) The Ray diagram of case the object is between pole and focus of concave mirror is in fig 2          And the nature of the image is         large,virtual, erect and behind the mirror 3) The Ray diagram of case the object is infront of convex mirror is in fig 3.         And the nature of the image is         small in size,virtual,erect 4) The Ray diagram of case the object is at 2f of convex lens is in fig 4.         And the nature of the image is         inverted, same size and real 5) The Ray diagram of case the object is in front of concave lens is in fig 5.        And the nature of the image is        real,small in size , erect

 

The major organs or structures that coordinate digestion within the human body include the mouth, esophagus, stomach, small and large intestine, and liver.

 

Mouth- The mouth is a specialized organ for receiving food and breaking up large organic masses. In the mouth, food is changed mechanically by biting and chewing. Food is moistened by saliva. The saliva contains an enzyme called amylase, which digests starch into maltose. During chewing, the tongue moves food about and manipulates it into a mass called a bolus. The bolus is pushed back into the pharynx and is forced through the opening to the esophagus.

Esophagus- The bolus of food moves through the esophagus by peristalsis

Stomach - The stomach is an expandable pouch located high in the abdominal cavity. Layers of stomach muscle contract and churn the bolus of food with gastric juices to form a soupy liquid called chyme. The stomach stores food and prepares it for further digestion. In addition, the stomach plays a role in protein digestion. Gastric glands called chief cells secrete pepsinogen, which is converted to pepsin in the presence of hydrochloric acid. The pepsin then digests large proteins into smaller proteins called peptides. To protect the stomach lining from the acid stomach cells secretes mucus that lines the stomach cavity.

Small intestine: The chyme enters from stomach to the small intestine. The three parts of small intestine are duodenum,  jejunum and ileum. The inner surface of the small intestine contains numerous fingerlike projections called villi. Each villus has projections of cells called microvilli to increase the surface area.

Most chemical digestion takes place in the duodenum. In this region, enzymes digest nutrients into simpler forms that can be absorbed. Intestinal enzymes are supplemented by enzymes from the pancreas. In addition, bile enters the small intestine from the gall bladder to assist in fat digestion.

The enzymes functioning in carbohydrate digestion include amylase (for starch), maltase (for maltose), sucrase (for sucrose) and lactase (for lactose).

For fats, the principal enzyme is lipase. Before this enzyme can act, the large globules of fat must be broken into smaller droplets by bile.

Protein digestion is accomplished by several enzymes, including two pancreatic enzymes: trypsin and chymotrypsin. Peptides are broken into smaller peptides, and peptidases reduce the enzymes to amino acids.

Nucleases digest nucleic acids into nucleotides in the small intestine also.

The products of digestion enter cells of the villi, move across the cells, and enter blood vessels called capillaries. Diffusion accounts for the movement of many nutrients, but active transport is responsible for the movement of glucose and amino acids. The products of fat digestion pass as small droplets of fat into lacteals, which are branches of the lymphatic system.

Substances that have not been digested or absorbed then pass into the large intestine.

Large intestine - The large intestine's chief functions are to absorb water and to store, process, and eliminate the residue following digestion and absorption. The intestinal matter remaining after water has been reclaimed is known as feces. The feces are stored in the rectum and passed out through the **** to complete the digestion process.

Given: Two resistors with resistances R1=5ohm and R2=10ohm, V=6volt 

(a) For minimum current these two should be connected in series. For maximum current these two should be connected in parallel. 

(b)In series, 

Total resistance = 5+10 = 15ohms 

Therefore total current drawn = V/R = 6/15 = 0.4amps 

In parallel, 

Total resistance R is given as 1/R=1/R₁+1/R₂ 

1/R =1/5+1/10 

1/R=3/10 

R=10/3 ohm 

Therefore total current drawn by the circuit = V/R = 6/(10/3) =1.8amps. 

Observation :

We see bubbles coming out vigorously with strong acids. This gas burn when we bring the candle to it .

Zinc also react with weak acids like acetic acid, but here gas formation is slow .

Blue-green

A wire is stretched to increase its length by 5% calculate percentage change in its resistance

 

Let say Resistance of Wire = R

Length = L

Area = A

Resistivity = ρ

 

R = ρL/A

 

Volume = V = LA

 

wire is stretched to increase its length by 5%

New L = L + (5/100)L = 1.05L

Volume remains same

so new Area = V/1.05L  = A/1.05

 

New resistance = ρ 1.05L /(A/1.05)

New R = (ρL/A) * (1.05)²

New R = R * 1.05²

 

increase in R  = R * 1.05² - R   = R ( 1.05 + 1)(1.05 - 1)  = R(2.05)(0.05)

 

% increase in R = (R(2.05)(0.5)/R ) * 100   = 2.05 * 5 = 10.25 %

 

10.25 % increase in resistance

The chemical equation for the reaction that takes place when Lead Nitrate and potassium iodide solution are mixed 

Pb(NO₃)₂ + 2KI → PbI₂ + 2KNO₃

What's your question??

What's your question?

What's your question?

Coz they don't know the answer

What is your question???

Dear, I haven't read this ch yet so I can't answer ur this question.... Sry

Ohm law state that at a constant temperature flow of current is directly proportional to voltage and resistance is inversely proportional .

OHM’s law states that under no same temperature, electric current flowing through an ideal conductor is directly proportional to the potential difference across its ends. V ∝ I V = IR, R – Resistance

OHM’s law states that under no same temperature, electric current flowing through an ideal conductor is directly proportional to the potential difference across its ends.

V ∝ I

V = IR, R – Resistance

1. A rainbow is a natural spectrum of sunlight in the form of bows appearing in the sky when the sun shines on rain drops.
2. It is combined result of reflection, refraction and dispersion of sunlight from water droplets, in atmosphere.
3. Always it formed in the direction opposite to the sun.
4. To see a rainbow, the sun must behind us and the water droplets falls infront of us.
5. When a sunlight enters into a spherical rain¬drop, it is refracted and dispersed. The different colours of light bent in different angles.
6. When different colours of light fall on the back inner surface of drop, it (water drop) reflects (different colours of light) internally (total internal reflection).
7. The water drops again refracts the different colours, when it comes out from the raindrop.
8. After leaving this different colours from the raindrop as rainbow, reach our eye. Thus, we see a rainbow.

A rainbow is formed by the dispersion of sunlight by tiny water droplets present in the atmosphere. The water droplets act like small prisms. Th ey refract and disperse the light ray coming from the sun, and reflect internally and finally refract it again when it comes out of the rain drop. That's how a rainbow consisting of seven colours is formed.

Both are occur in different place.

Respiration can takes place in any part of the body but cellular respiration takes place only in cells. Hence,both are not same. ?Mayank

Respiration can be in any organism but cellular respiration means respiration in cells

Chlorofluorocarbons or the CFC are the main cause of ozone layer depletion. These are released by soaps, solvents, spray aerosols, refrigerators, air-conditioners, etc.

The molecules of chlorofluorocarbons in the stratosphere are broken down by the ultraviolet radiations and release chlorine atoms. These atoms react with ozone and destroy it.

What's your question??

Which question dear

An acid called formic acid (or methanoic acid) is present in ant stings. The chemical formula of formic acid is HCOOH. To get relief from the discomfort caused by the ant stings, apply baking soda on the affected area. Baking soda is basic in nature and it reacts with acid to produce neutral salt.