In Yeast: Yeast gets energy through anaerobic respiration. In the absence of oxygen, glucose breaks down into alcohol and carbon dioxide
GIucose\(\xrightarrow{in\ the\ absence\ of\ oxygen}\) Alcohol + Carbon dioxide + Energy
In Muscles: Our muscles can also respire anaerobically, but only for a short time. During heavy exercise, anaerobic respiration takes place in which glucose broken into lactic acid and energy.
Glucose\(\xrightarrow[of\ O_2]{absence}\)Lactic acid + Energy

Handle of a metallic kettle is covered with strips of cane because when kettle is heated, the heat does not pass through strips of cane. The strips of cane are bad conductor of heat and we may hold the handle with our bare hands.

Various alternative arrangements for sewage disposal other than WWTP are septic tanks, chemical toilets and composting pits. Septic tanks are suitable for places where there is no sewage system, such as hospitals, isolated buildings or cluster of 4-5 houses. In other methods, the excreta flow through covered drains into a biogas plant. The biogas thus produced is used as a source of energy.

Differences between speed and velocity:

When a farmer uses excessive chemical fertilisers in the soil then the soil becomes acidic. Plants do not grow well when the soil is either too acidic or too basic. When soil is too acidic, it is treated with bases. If the soil is basic, organic manure is added to it. Organic manure release acids which neutralise the basic nature of the soil.

The number of problems that can be faced due to shortage of water are as follows
(i) Less amount of pure drinking water will be available.
(ii) Lack of equal distribution of water.
(iii) Drought.

Since the magnetic effect directly depends on the number of turns of the coil. As, Paheli's coil has more number of turns than Boojho. So, her electromagnet is stronger than Boojho.
So, electromagnet of Paheli attracts more pins as compared to Boojho.

The parts in the given figure are labelled as follows

Since, the image is 6m away from the plane mirror. So, it means that the object is also 6m away from the mirror.

[Because OP = PI]
So, when the person moves 2m towards the plane mirror, then the distance between the person and the plane mirror will be equal to (6 m- 2 m)= 4 m, this means that distance between the image and the mirror will be 4m.

The distance between the person and his image = PO'+ PI' = 4 + 4 = 8 m

The forests provide us oxygen to breathe. If we rapidly cutting down forests means we are cutting down the oxygen supply to us. That is why they are called green lungs.

Here.the white fleece of the lamb refers to pure white coloured hairy skin of the lamb.

(b) Process B is a chemical change. Process A is a physical change. The LPG in the cylinder is in liquid form because of high pressure. When it comes from the cylinder, it turns into gas. It is a physical change. Process B is a chemical change because the burning of gas is a chemical change.

I will help my neighbours in case cyclone approaches my village/town by the following ways:
(i) I will help in shifting their household articles, domestic animals, etc., to safer place. (ii) I will provide phone numbers of all emergency services like police, fire brigade and medical centres.
(iii) I will give them safety advice like avoid driving on roads through standing water, not to touch wet switches, etc.

Nepenthes or pitcher plant modifies its leaf axis into a long tubular pitcher to form a pitfall trap. Inside the pitcher sticky liquid is present. When any insect comes in contact with the leaf, the lid present on it is closed and insect is trapped. The liquid contains digestive enzymes which slowly digest the trapped insects.

When our cells perform their functions, certain waste products are produced. These waste products are toxic and hence need to be removed from the body. The process of removing waste products produced in the cells of the living organisms is called excretion.

Parts of digestive canal that are involved in following processes are
(a) small intestine
(b) buccal cavity
(c) stomach
(d) small intestine
(e) large intestine

The maximum temperature of the day occurs generally in the afternoon while the minimum temperature occurs generally in the early morning.

All the organisms need energy for their various functions. Energy is released from the breakdown of food (glucose) with the help of oxygen. The breathing ensures the continuous supply of oxygen to different body cells.  

Steel being a good conductor of electricity allows a clear passage of the energy of lightning to the ground with any damage. Therefore, they do not need lightning rods.

The trees have crowns of different sized and types. These create different horizontal layers in the forest. These are known as understoreys. Giant and tall trees constitute the top layer followed by shrubs and tall grasses and herbs form the lowest layer.

Cocoons of silk moth are used to obtain the silk fibres. These cocoons are kept under the sun or boiled or exposed to steam. The silk fibres separate out. This process of obtaining wool from the cocoons is called reeling the silk. Reeling is done in special machines

The polar regions present an extreme climate. These regions are covered with snow and it is very cold for most part of the year. The sun does not set for six months and does not rise for other six months. In winter, the temperature can be as low as - 37°C.

In the above condition, the groundwater get recharged through the process of infiltration. It replenishes the groundwater.

When the current through the coil stops flowing, the coil does not remain an electromagnet.

Window should preferably towards the sea beach so that the sea breeze coming from sea keeps the house cool during the day time.

Reproduction is the process of production of new similar organisms from their parents.

For a single incident ray, there will be only one reflected ray that can be obtained in respect of a plane mirror

22 March.

By suspending a metal ball with the help of a cotton thread and the other end of the thread can be tied to some different supports, so in this way, we can prepare a pendulum by our own.

When iron nails are dipped in copper sulphate solution, then the colour of the solution changes to green.

Arteries carry blood at a very high pressure due to pumping action of heart hence, the need of thicker walls.

No, it is because different types of soil has different absorbing capacity of water.

The mode of nutrition in which organisms take their nutrients from dead and decaying matter is called saprotrohic mode of nutrition.

When hydrochloric acid reacts with sodium hydroxide solution, then sodium chloride salt is formed.

We should not eat hurriedly because if we ingest food in hurry or we talk or laugh while eating we experience hiccups, coughing or choking sensation.

Plants take in oxygen and give out carbon dioxide. In the cells, oxygen is used to breakdown glucose into carbon dioxide and water as in other organisms. In plants each part can independently take in oxygen from the air and give out carbon dioxide.
 
Leaves of the plants have tiny pores called stomata for exchange of oxygen and carbon dioxide. Like all other living cells of plants, the root cells also need oxygen to generate energy. Roots take up air from the air spaces present between the soil particles. The stems of some plants have tiny pores called lenticels which help in exchange of gases.

Treatment of waste water involves physical, chemical and biological processes which remove physical, chemical and biological matter that contaminate waste water.
These steps are as follows :
(i)Waste water is passed through bar screens. Large objects like rages, sticks, cans, plastic packets, napkins get removed.
(ii) Waste water then goes to a grit and sand removal tank. In this the speed of the waste water is reduced to allow, sand grit and pebbles to settle down.
(iii) The water is then allowed to settle in a large tank which is sloped towards the middle solids like faeces settle down at the bottom and are removed by a scrapper. A skimmer removes the floatable solids like oil and grease. The sludge is then transferred to another tank where it is decomposed by anaerobic bacteria.
(iv) Then air is passed through clarified water to allow aerobic bacteria to grow, which consume the remaining organic waste. This water is then released into the water bodies.

Electric bell consists of an iron hammer around which a wire is wound. When current is passed by pressing the button, the wire turns into a temporary magnet. The hammer is attracted towards gong to make sound. When this strikes, the current is disconnected automatically. It happens due to shift arrangement in it. The magnetic property of wire is lost and it comes back to its original position through a spring. In this way, we get separated hammering, resulting in ringing of an electric bell

The reasons of depletion of water table:
(1) Increase in population.
(2) Industrialisation.
(3) Agricultural activities.
(4) Scanty rainfall.
(5) Deforestation.
(6 Decrease in the effective area for seepage of water.
Effect of increasing population:
As the population increases, demand for construction of houses, shops, offices, roads and pavements is increased. This decreases the open areas like parks and playgrounds. This in turn decreases the seepage of rainwater into the ground. More over a huge amount of water is required for construction work. Often groundwater is used for this purpose.
So, on the one hand we are consuming more groundwater and on the other hand we are allowing less water to seep into the ground. This results in the depletion of water table.

Blood is a fluid which flows in blood vessels.
(a) Functions of blood :
(i) It transports digested food from small intestine to all parts of the body. 
(ii) It carries oxygen from lungs to cell.
(b) Components of blood:
(i) Fluid: Plasma
(ii) Cells: RBC,WBC, Platelets.

The following steps may be followed:
(i) Draw two perpendicular lines to represent the two axis and mark them OX and OY. O is the intersection of the two axis
(ii) Decide the quantity to be shown along the x-axis and that to be shown along the y-axis. From the given data, we are measuring distance at given intervals of time. So time is to be shown along x-axis distance along y-axis
(iii) Choose a scale to represent the given data. Suppose we have 4 squares (or 40 divisions) along x-axis and 4 squares (or 40 divisions along y-axis. Along x-axis we can take 10 divisions equal to 15min and along y-axis we can take 10 divisions equal to 20 km.
(iv) Mark the values of time and distance on the respective axis.
(v) Now mark points on the graph paper to represent each set of values for distance and time.
(vi) Join all points on the graph. Graph obtained is shown below:

(a) As we know that plastic is a bad conductor of heat which does not allow the heat to pass through itself. So, heat from the fry pan does not flow to the handle due to which we can hold it easily. So that's why, the fry pans are provided with the plastic handles.
(b) The value showed by Pooja here is a great concern and careness towards her five years old small daughter.

(a) The given figure shows grafting method (vegetative reproduction),
(b) Mango and rose are the two plants where this method of vegetative takes place,
(c) It is asexual method of reproduction,
(d) (A) Scion
     (B) Stock.

(a) Convex mirror is a mirror which is used as a rearview mirror. It is used to get a wide view of traffic behind.
(b) The values exhibit by Namit here is courtesy concerned for other, sympathy, knowledgeable.

Forests maintain balance in nature. There conservation is the need of the hour. We should take the following steps to conserve the forests.
(i) Planned harvesting An efficient way to get wood from forests for our requirements is to cut only some of the trees in an area. The uncut trees prevent erosion. Fruits of these trees produce seeds so that new trees can grow. This way the forest cover is maintained.
(ii) Afforestation This is the practice of renewing a forest by planting seedlings or small trees. These days, in our country, planned afforestation is being done not only by the government but also by private organisations for commercial purposes. Selective cutting of trees in these plantations provides wood for construction and also keeps the forest cover intact.
(iii)Protection from fire Huge forest areas are destroyed by fire every year. Fire may occur due to the carelessness of people or due to lightning during a storm or by friction between dry stems and dry branches of trees.Forest fires are controlled by spraying fire extinguishing solutions from aircrafts or by changing the direction of wind by using strong blowers.

(a) Seawater is collected in shallow pits. It is then allowed to evaporate in the sun. As the water evaporates, the salt solution becomes supersaturated (concentrated). This supersaturated solution cannot hold the excess salt. Thus, it separates out in the form of salt crystals. These salt crystals are collected and are redissolved in water and filtered to remove insoluble impurities. The clear solution is again evaporated to obtain the crystals of pure salt.
(b) Salt is obtained from sea water by the process of evaporation.
(c) The values shown by Karan are curious, aware and intelligence

(a) An earthworm helps in making the rich humus in soil.
(b) Ant, earthworm, termites, milipede, centipede, etc.
(c) Curiosity to learn and scientific attitude

Animals like tiger, wolf, lion and leopard are carnivores and do not eat plants. They hunt and eat herbivorous animals like deer, gaur, bison, zebra, giraffe, etc., which are dependent on plants for food.
If there are no plants, herbivorous animals will not survive and ultimately animals like tiger, wolf, lion and leopard will have nothing to eat.

China rose (gudhal) is an acid-base indicator.
China rose solution in different medium shows following changes:
China rose + acid \(\longrightarrow\) Give dark pink colour, hence A is an acidic solution.
China rose + base \(\longrightarrow\) give green colour, hence B is a basic solution.
China rose + neutral \(\longrightarrow\) No change in colour, hence C is a neutral solution.

The process of fusion of the male and the female gametes is called fertilisation.