Now we are going to discuss question number 21 till end. Okay, first of all i will read the question. Then we will discuss answer one by one and we will find the most suitable option understood now, question 21 in order to reduce your frictional forces with the environment whenever we use this word reduce, so you must use. Oiling. Oiling is the method by which you can reduce the friction. What is friction friction is a force that two surfaces exerts on each other when they rub against each other. It means when they are in contact, so they produce some friction surface pushing together. These are the factors rough versus small surfaces, small surfaces have low friction. Rough surfaces have higher friction lubricants, oil or grease. So if you apply lubricants or grease, you can reduce the friction. If you press forcefully high friction rough surfaces, high friction, press lightly, low, friction, smooth surface low, friction the real option. Bicyclists stand upright and wear white clothing. The standing position doesnt affect on friction so is wrong. Swimmers keep their arms wide open, uh wide open. It means there is no relation in this ss with because, if you minimize the friction, so you have to keep the streamlined body not wide open arms, so this is again wrong see we have to consider the fact that there is friction only with water, not with There no air, resistant and water resistant both are present in the environment d, speed, skaters, wear tight glossy clothes and keep their hand close to their bodies.

It means the position is different and glossy clothes. Obviously, this is for this minimize the friction. So i think d is correct e as well. The friction of a car with the air does not depend upon the shape of a car. No shape also affect the friction. So d is the most suitable answer because glossy the word glossy you can keep this thing in mind: glossy means greasy or uh some oiling. So this growth, this type of cloth, reduce the friction. Okay got it now. Move on question number two question: 22: paranesium is a unicellular organisms, with the shape of resembling the soul of a shoe. You can see this. This type of this organism is known as paramecium, and you can see this hair like structure. They are known as celia. Actually, i am talking about uni cellular organisms and some particular organ they have by me. They can move. So i would like to give this information first then we will read the question, so you can see this here like a structure. This is a unicellular organism. This is called paramecia, you can see in this picture euglena, and this claim i do not as well. This is also lg, and this is also planned, euglena and both have this this type of structure. This is known as flagella the green algae of microwave, the the it has two flagella. This is climato glass. It has one flagella. This is just like a thread like a structure, not real like a structure and another unicellular organism that is known as amipa.