Study life

 WHAT IF IT RAINS HEAVILY Every place in the world gets rains sometime or the other. The time, duration and amount of rainfall varies from place to place. For example, in some parts of the world, it rains throughout the year whereas in other parts it rains only for a few days in a year. In our country, most of the rainfall occurs in the monsoon season (rainy season). Rains are always welcome. Rains give us many advantages. For example: (1) Rains bring relief by cooling the environment after hot summer days. (ii) The sowing of many crops depends on the arrival of rains during monsoon. (iii) Rains provide water in the rivers and dams of hydroelectric power plants. (fo) Rains fill the lakes and ponds which act as sources of water. Rains are also responsible for the groundwater which gets stored under the surface of earth. When it rains heavily for a long time, we get excess rainfall resulting in too much water all around. The excessive rainfall due to heavy rains leads to many problem...

 Carbon dioxide Carbon dioxide is a colourless and odourless gas. It has a slightly sour taste. Carbon dioxide is moderately soluble in water. Carbon dioxide gas neither burns nor supports burning. Carbon dioxide extinguishes a burning fire. Plants and animals consume oxygen from air for respiration and produce carbon dioxide. Plant and animal matter burns by consuming oxygen from air and produces mainly carbon dioxide and a few other gases. If some material is burning in a closed room, we feel suffocated. This is due to the accumulation of excess of carbon dioxide (and some carbon monoxide) in the air of the room which is produced by the burning material. Air contains only about 0.03 per cent of carbon dioxide gas. Though the amount of carbon dioxide in air is comparatively small but it is a very important component of air. The carbon dioxide gas present in air is important to green plants. Green plants need carbon dioxide gas to make food. In sunlight, green plants use carbon di...

 Waste materials (or rubbish) especially household wastes, are called garbage. It is called 'kole in W Hi Every household produces a lot of garbage (or wastes) daily which is collected in dustbins ps offices and schools also produce garbage or rubbish everyday What does the garbage (or rubbish) This will become clear from the following discussion. We peel off many fruits and vegetables before eating or cooking them. Sometimes cooked food also cunased in our homes and it is called left over food. The leaves of potted plants also keep on falling day in our homes. The peels of fruits and vegetables, left-over cooked food and fallen leaves of ted plants are thrown away as garbage. Every household buys a large number of packaged products such as door (atta), rice, pulses, biscuits, chocolates, milk and oil, etc, which are packed in plastic bags. ardboard cartons, paper wrappers, plastic containers, tirs and many other kinds of packing materials All the packing materials are useless and...

  A large area of land covered mainly with trees and plants is called alaust And a large area of grass covered land used for grazing is called grassland There are few trees or places for animals to hide gland habitats. Due to this speal is important for the animals which live in grassland habitats (so they can nits away from their enemies) For most common purposes, however, the wrous forest and and are used in the same sense. The forest (or grassland) is a habitat Many animals such as lon som elephants deer, en live in forest habitats. There are many features of a lion, a deck, other animals and plant which help them to survive in the forest habitat. The adaptations in lion and deer to the forest habitat are described below. Adaptation of lion The lion is a camivorous animal which eats only the meat (or flesh) of oder animals. The lion lives in a forest habitat The adapted to the forest habitat in the following ways: 1.The lion is a strong, fast and agile animal which can hunt and ...

 The leaf is a thin, broad, flat and green part of a plant which is attached to the stem (or branch). plural of leaf is leaves. A plant has a large number of leaves. Leaves of different plants have differe shapes and sizes, but all of them have the same basic structure. A leaf consists mainly of two parts: lamina and petiole (see Figure 8). Lamina is commonly ke o as leaf blade and petiole is commonly known as leaf stalk. The broad, green part of the leaf is called lan th The thin stalk with which leaf is attached to the stem (or branch) is called 'petiole. There is a mid tr (main vein) in the centre of lamina (or leaf blade). A large number of veins spread out from the mid Rib to all the parts of the leaf. The mid-rib and veins consist of bundles of tiny tubes some of which carry water (and dissolved minerals) into the leaf, and others carry away the food from the leaf. There are minute pores on the surface of a leaf (which are called stomata). Stomata are so small that we cannot ...

  Birds Sparrow, crow, pigeon, parrot, eagle, hen, duck, swan, ove and peacock, are all birds. Birds walk on the ground and igh also fly in air. Some birds (like duck and swan) also swim in my water. Birds walk on the ground by using their hind limbs (see Figure 18). Those birds which swim in water do so by raig pushing against water with their hind limbs which have d trio webbed feet. The webbed feet help the bird in swimming in water. The birds can fly because their bodies are adapted (or modified) for this purpose. The main adaptations which have been made in the bodies of birds by nature to enable them to fly are the following: Their forelimbs are modified to form wings for flying.  Their flight feathers provide a large flat surface which is light but strong. Their bones are hollow and light. Their bodies are streamlined and extremely light. They have powerful flight muscles. Their breastbone is extended (as keel) for the attachment of large flight muscles (which move the ...

 NITROGEN Nitrogen is a colourless, tasteless and odourless gas. Nitrogen gas is slightly soluble in water. Nitrogen gas is not essential for breathing (or respiration). Nitrogen gas neither burns itself nor supports the process of burning. That is, nitrogen does not support combustion. Nitrogen is a very unreactive gas. In this respect, nitrogen is just the opposite of oxygen (which is a very reactive gas. Nitrogen gas present in air is important for living things. All the living things need nitrogen com pounds for their growth. The plants use nitrogen gas of the air to make proteins. These proteins are used by the plants for their own growth as well as for the growth of human beings and other animals. Thus, nitrogen is needed by plants to make protein. Oxygen:- Oxygen is a colourless, tasteless and odourless gas. Oxygen gas is slightly soluble in water. Oxygen gas is essential for breathing (or respiration). We can live for several days without food and water but we will die very...