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THE IMPORTANCE OF VARIATION - On the basis of their ability to reproduce, different populations occupy particular places or niches in an ecosystem. The process of duplication of genetic material (DNA) during reproduction is important for the determination of body features of an organism. These features permit an organism to fit itself in a particular niche. Thus, reproduction is related to the stability of various populations. However, organisms have to change their niches under circumstances they cannot control. Such circumstances may be: temperature fluctuations, change in water levels, meteorite hits or some natural calamities. A population of reproducing organism suited to a particular niche will perish if the niche undergoes drastic change. In case, there are some variations in the members of population, chances are there for the survival of the variants in the changed niche. For example, a population of bacteria living in temperate waters would die, if the water temperature r...

INTRODUCTION Communication: Communication is the concept of sharing/exchanging of information/idea by writing, speaking or any other medium. It is a two-way process. Communication skills are often used in organization/business, home or at workspace by using soft skills. It is a way to represent yourself in front of other parties efficiently and effectively. For example, After completion of your educational qualification, when you apply for a job, you need to communicate for sending an email. Communication is performed from Birth to Death in everyone's life. TYPES OF COMMUNICATION Communication can be categorised in three ways: (1) Verbal Communication (2) Non-Verbal Communication (3) Visual Communication 1. Verbal Communication: It is a method to communicate by using speech or words. It is a basic type of medium which is used in family, friends and relatives. Verbal communication has the requirement to learn a specific language which is understood by both parties. It ...

Question=A metallic right circular cone 20 cm high and whose vertical angle is 60° is cut into two parts at the middle of its height by a plane, parallel to its base. If the frustum so obtained, be drawn into a wire of diameter1/16 cm, find the length of the wire. Solution=Let VAB be the solid metallic right circular cone of height 20 cm. Suppose, this cone is cut by a plane parallel to its base at a point O' such that V O^ prime =0^ prime 0,i i.e. O' is the mid-point of VO. Let r1and r2 be the radii of circular ends of the frustum ABB'A'. In right triangles VOA and VO'A', we have tan 30 deg = (OA)/(VO) and tan 30 deg = O^ prime A^ prime VO^ prime 1(sqrt(3)) = r 1 20 : and 1/(sqrt(3)) = r_{2}/10 r_{1} = 20/(sqrt(3)) * cmi and r_{2} = 10/(sqrt(3)) cm Volume of the frustum = 1/3 * pi(r_{1} ^ 2 + r_{2} ^ 2 + r_{1}*r_{2}) * h Volume of the frustum = pi/3 * (400/3 + 100/3 + 200/3) * 10c * m ^ 3 = 7000/9 * pi*c * m ^ 3 Let the length of the wire of 1/16cm di...