Category: General Science

Forms of Oceanic Energy

Forms of Oceanic Energy: The energy from the oceans is available in many forms. The main forms in which energy is available from the oceans are- ocean thermal energy, the energy of sea waves, tidal energy, energy from salinity gradient from the sea, energy from sea-vegetation or biomass and energy from the nuclear fusion of

Why the Stars do not Collapse?

Why the Stars do not Collapse? In a star that is emitting heat and light energy, two types of forces are acting continuously: the gravitational attraction of the enormous gaseous matter which wants to compress the star further and the internal pressure developed in the star because of energy released during nuclear fusion reactions going

Inorganic Constituents of a Cell

Inorganic Constituents of a Cell: Inorganic Constituents of a Cell include- Water. Minerals and salts. Water: Water is the most abundant inorganic constituent of the protoplasm and constitutes about 70-80 per cent of the protoplasm or the cell. In the protoplasm, water occurs in two forms, i.e., free water and bound water. The 95% of

Habitat and Ecological Niche

Habitat and Ecological Niche: Habitat: Habitat is defined as a specific place or locality where an organism lives. A habitat is a physical entity comprising the sum total of the abiotic factors to which a species or a group of species is exposed. It may be as large as the ocean, Pond, lake or forest.

Biology and its Branches

What is Biology? Biology is defined as the branch of science that deals with the study of living organisms. It has been divided into two main subdivisions- Zoology (the study of living animals) and Botany (the study of living plants). Various Branches of Biology: Parasitology- is the branch of biology that deals with the study

Phylum Platyhelminthes (The Flatworms)

Phylum Platyhelminthes: Platyhelminthes is a phylum of dorsoventrally flattened acoelomate but triploblastic animals having bilateral symmetry and blind sac body plan. Due to their flattened nature, Platyhelminthes are also called flatworms. The term Platyhelminthes was coined by Gegenbaur (1859). Characteristics of Phylum Platyhelminthes: Flatworms are free-living commensal or parasitic organisms. The free-living worms may be

Phylum Coelenterata or Cnidaria

Phylum Coelenterata or Cnidaria: Cnidarians are the first true metazoans that have attained tissue grade of construction. Cnidaria is a phylum of diploblastic, acoelomatic animals that possess stinging cells and a blind sac gastrovascular cavity. The phylum evolved in the Proterozoic era, more than 600 million years ago. The term Coelenterata was coined by Leuckart

Structure and Functions of Phloem

Structure and Functions of Phloem: Phloem or bast is a complex, permanent tissue of vascular plants which conducts organic food. Its elements were discovered by Hartig (1837). The term was coined by Nageli (1858). Phloem consists of four types of elements- sieve cells or sieve tube elements, companion or albuminous cells, phloem parenchyma and phloem