Saturday, October 13. 2018What come first-plant or animal?
From time immemorial, the question of how this Universe came to be has haunted Man’s mind. While ancient Man chose to believe in the easiest answer that everything came into existence-through an act of God, modern science persisted with rational enquiries that proved otherwise. Have you ever wondered what it must have been like millions and millions of years ago, when the earth first came into existence? Were there plants and animals then? When the earth was first formed, there was no life on it. Its surface was extremely hot and had giant volcanoes that threw fiery rocks, dust, and gases into the air. Scientists estimate that the first life forms on Earth were primitive, single-celled organisms. They must have appeared about three billion years ago in the oceans. They had no bones or shells, so they looked more like worms and jellyfish. These one-celled organisms gradually became multi-cellular organisms. As time passed, more complex forms of life began to fill up oceans. One of the first forms of life was a very simple plant called algae. Different types of plants came later on. And so, yes, animal life appeared only after the appearance of plant life. Saturday, October 13. 2018How do plants and animals differ from each other?You must have observed huge trees in your own backyard that have been staying in the same place for years, without any explicit signs of movement. Unlike animals, trees cannot move about, eat through the mouth, express emotions and communicate their needs. Plants and animals are as different from each other as a rose is from a rabbit! Generally, plants, with a few exceptions like the swimming algae, cannot move about from place to place, while animals can move freely. One of the most distinguishing features of plants is that they can make their own food with the help of their green colouring, which is called chlorophyll. On the other hand, animals must rely on plants for their food, or hunt other animals. Animals have a nervous system, which makes them sensitive to touch, heat, cold, pain, and other stimuli. Plants lack such a nervous system. However, as you must have observed, some plants such as the touch-me-not, do fold their leaves when touched. Others sense that a support is near, and twine themselves around it. The cell structure of plants and animals is different too. Most plants have rigid cell walls and contain cellulose. Animal cells do not have cellulose. The development of animals and plants is different too. While animals stop growing when they reach maturity, plants do not stop growing until they die!
Thursday, October 11. 2018Why should we plant trees?
Do you know that looking intently at the lush green of trees when your eyes are sore will soothe them? Green is the colour of life, renewal, growth, harmony and freshness. Trees and plants are essential for life on earth. We should make a combined effort to grow more and more trees on earth. Trees are the best supporters of life. They form the primary component of all food chains. All living organisms depend on plants in one way or the other. Their destruction affects food chains and ecological balance. Trees are the natural habitat of many living things. Hence, it is our duty to protect trees and plants. Cutting trees is often done for timber, paper and clearing land for construction. However, cutting of trees robs wildlife off their natural habitats. Hence, we should stop cutting trees and plants as far as possible. Picture Credit : Google |
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