Plants can be broadly divided into two types: flowering plants and non-flowering plants. In this case, flowering plant is also known as angiosperms while non-flowering plant is known as gymnosperms. Based on the nature of the embryo in the seed, angiosperms are again divided into the following two types: Monocotyledonous (Monocots) and Dicotyledonous (Dicots) plants. … Read more
The heart in all animals is a muscular organ. In human, it is placed in the position of the thoracic cavity just behind the sternum and is slightly tilted to the left. Thus, the heart-beat is felt on the left side. It pumps blood throughout the blood vessels to various parts of the body by … Read more
Ecosystems are of two main types such as terrestrial ecosystem and aquatic ecosystem. In this case, terrestrial ecosystems constitute the land masses which cover about 28% of the surface of the Earth. Some notable examples of terrestrial ecosystems are tundra, desert, alpine regions, rainforest etc., while the aquatic ecosystems are found in water environment that … Read more
Blood is a fluid connective tissue which is an essential component in the human body. If the body losses this fluid, it may cause life threatening. Through the clotting mechanism, the body defends against loss of blood. In this case, different coagulation factors, vascular mechanisms, thrombocytes, enzymes, prostaglandins and proteins play important role to clot … Read more
The gymnosperms are a group of seed-producing plants which are also known as Acrogymnospermae. The term ‘Gymnosperm’ is originated from two Greek words, ‘gymnos’ meaning naked and ‘sperma’ meaning seed. It is a smaller ancient group of plants that produce naked seeds because their seeds are not enclosed by a fruit. On earth, more than … Read more
Ecological balance is maintained when the environmental factors remain in a state of balance. If one or more of these factors are disturbed to any extent, then they may be recovered soon. But gross natural calamities like flood, earthquake, volcanic eruption, etc. destroy the ecological balance considerably and environmental organisms are liable to destruction. The … Read more