Phylum – Porifera – (Pore-bearing) Introduction: The porifers are commonly known as sponges. Porifers consisting the most primitive multicellular animals. These are pore-bearing animals, the body does not consist of organs and they can regenerate their lost parts. The phylum includes around 5ooo species. These are the first multicellular animals. Read more…
Animal kingdom – Classification The kingdom is the second-highest taxonomic rank below the domain. Under the kingdom Animalia, the multicellular, eukaryotic organisms with few exceptions are placed. Basis of Classification of Animal Kingdom Some common features are used as the basis of the classification of animals. These are common to Read more…
Angiosperms (Angios- vessel, sperma- seeds) Features of Angiosperms Angiosperms are flowering plants, in which the flower is developed by ovule and pollen grain. Seeds are found always enclosed in fruits in angiosperms. These are the most familiar plant-like mango, peas, coconut, wheat, and rice. The angiosperms diversified extensively during the Read more…
Gymnosperms Gymnosperms: The gymnosperms are spermatophytes i.e. seed-producing plants. The Gymnosperms (Gymno: naked, Sperma-seed) are the form of a plant in which the ovules are not enclosed by the ovary wall. In these plants, the ovule remains uncovered i.e. naked before and after fertilization. After fertilization, developed seeds are also Read more…
Pteridophytes (Greek word- Pteron– feather, phyton– plant) Pteridophytes are the first terrestrial plants (the most primitive cryptogamic land plants) that possess vascular tissue the Xylem and Phloem. The most common pteridophytes are horsetails and ferns and lower vascular plants. They are commonly called vascular cryptogams, snakes of plant kingdom or botanical Read more…
The Bryophytes Bryophytes are also called Amphibians of the plant kingdom. They include mosses and liverworts which grow commonly in the moist shaded area in the hills. They show haplo-diplontic life cycle. These are called Amphibians of the plant kingdom because they can live on soil but for sexual reproduction, Read more…
Plant Kingdom-The Algae Introduction of Plant Kingdom Plant and animal kingdoms both include a wide variety of organisms that contribute to biodiversity. we can define Plants as Multicellular, Eukaryotic, and Photosynthetic Autotrophs rarely found heterotrophs having cellulosic cell walls. All are embryophytes. Echiler (1833) divided the plant kingdom into two Read more…
Biological classification-Five Kingdom System Biological Classification: First of all, Aristotle attempts a scientific basis for classification. Aristotle used simple morphological characters to classify plants into trees, shrubs, and herbs. He also divided animals on the basis of red blood (enaima) and one which did not have red blood (anaima). Two Read more…
Reproductive system in human Humans reproduce sexually and are viviparous (produce young ones rather than eggs). It goes through various steps and can be studied in two-part- i.e. male reproductive system and the female reproductive system The main processes in the reproductive system are the Formation of gametes, fertilization, pregnancy, and Read more…
Reproduction in Organisms Reproduction in Organisms: In simple language, the definition of reproduction is “The process by which living organisms produce their offspring for the continuity of their species is known as reproduction.” It is one of the most important characteristics of organisms. In this process, the genetic material transmits Read more…