Category Physics

Ants do not get hurt when they fall. Why?

            The fall of a body is controlled mainly by gravitational attraction of the Earth. The gravitational force depends on the mass of the falling object-a heavier object is attracted more than a lighter object. This attractive force is opposed by an upward thrust (resistance) offered by air on the body. This resistance also depends on the surface area of the object. That is, if the surface area is more, the resistance is also more. Thus in any falling object, these two forces compete with each other.

            In the case of an ant, the force of gravity is almost balanced by air resistance and so it is able to land safely. If there is a wind blowing, ants also float away. However, if a cluster of ants or a big ant is forcibly hurled to the ground, they will get hurt. Anyway, it will be difficult to know whether the ant gets hurt or not.

What do we know about the geography of Odisha?

Odisha lies on the eastern coast of India. It is bounded by West Bengal in northeast, Jharkhand in the north, Madhya Pradesh in the west, Andhra Pradesh in the south, and the Bay of Bengal in the east. Orissa can be divided into three broad regions – the coastal plains, the middle mountainous country and the plateaus. The region of the coastal plains is a combination of several deltas formed by the major rivers of Odisha, such as the Subarnarekha, the Budhabalanga, the Baitarani, the Brahmani, the Mahanadi, and the Rushikulya. The middle mountainous region covers about three-fourths of the entire state and comprises the hills and mountains of the Eastern Ghats. The plateaus are mostly eroded tablelands, forming the western slopes of the Eastern Ghats.   To sum up, the state offers diverse habitats from lush green and hilly terrain, to coastal plains and rolling river valleys, criss-crossed by rivers that include the Brahmani, the Mahanadi and the Bansadhara.

How do ants find their way to hidden sweets?

            Antennae, the two hair-like structures on the head of the ants, help them in locating sweets. These chemoreceptor’s help them to perceive smell and taste through minute sensilla, or sensory cells.

             These sensilla can detect accurately the smell in the air. It points towards the origin of the smell by detecting accurately the changes in the concentration of the odoriferous particles. If the sweets are wrapped in paper bags or any other wrappers having minute holes, the odour carried by the air will be sensed by the sensilla. If the antennae are removed, ants cannot identify the smell and distinguish them from other foods.

What do we know about the geography of Nagaland?

Nagaland is located on the extreme north east, just below Arunachal Pradesh. The terrain is hilly, rugged, and mountainous. The highest peak is Saramati in the Twensang district, which is 3840 metres above sea level. The average height of the peaks is between 900 and 1200 metres. The hillsides are covered with green forests. In fact, 20 percent of the total area of the state is covered with wooded forest, rich in flora and fauna. The only well known lake is Lacham.The state of Nagaland is drained by four chief rivers of Doyang, Jhanji, Dhansiri and Dikhu. The rivers are the tributaries of the mighty Brahmaputra River, with their sources in the mountain ranges of the state.

Tourism in Meghalaya

Meghalaya is a tourist’s paradise and is home to some of the most pristine forests in India. With its many national parks, deep valleys, arching waterfalls, and charming villages, it is a great gateway destination indeed. Earth, Cherrapunjee, is in Meghalaya. It gets over 11,430 millimeters of rain every year, inundating virtually the entire area for months at a time and tourists flock here for the experience