Developmental Biology

Developmental Biology

What is Developmental Biology? It is the field of biology that studies the processes by which multicellular organisms grow and develop, controlled by their genes.  It involves the study of mechanisms of development, differentiation, and growth in animals and plants at the molecular, cellular, genetic and evolutionary levels. It also encompasses the biology of regeneration, asexual reproduction, metamorphosis, and the growth and differentiation … Read more Developmental Biology

General Characteristics of Phylum Porifera

General Characteristics of Phylum Porifera

General Characteristics of Phylum Porifera Some of the characteristics are: Porifera are all aquatic, mostly marine except one family Spongillidae which lives in freshwater. They are sessile and sedentary and grow like plants. The body shape is vase or cylinder-like, asymmetrical or radially symmetrical. The body surface is perforated by numerous pores, the Ostia through … Read more General Characteristics of Phylum Porifera

General Characteristics of Phylum Protozoa

General Characters of Phylum Protozoa

General Characteristics of Phylum Protozoa Some of the characteristics are: There are about 50,000 known species of Phylum Protozoa. Protozoans exhibit mainly two forms of life; free-living (aquatic, fresh water, sea water) and parasitic (ectoparasites or endoparasites). They are also commensal in habitat. They are small, usually microscopic, not visualize without a microscope. They are … Read more General Characteristics of Phylum Protozoa

Classification of Phylum Protozoa

Classification of Phylum Protozoa

Classification of Phylum Protozoa Phylum protozoa is a large and varied group and possess a complication in its classification. The conventional scheme followed by Hyman (1940), Hickman (1961) and Storer (1965) etc. recognizes two subphyla on the basis of organs of locomotion and 5 classes as follows: Sub Phylum A: Plasmodroma Locomotory organelles are flagella, … Read more Classification of Phylum Protozoa

Lower and Higher Invertebrates with their differences

Lower and Higher Invertebrates

Lower and Higher Invertebrates with their differences The invertebrates are usually classified as Lower Invertebrates and Higher Invertebrates. Lower Invertebrates The lower invertebrates are simple in body organization. They are generally small in size. These are thought to have originated in the main lines of evolution, near the base of the phylogenetic tree of Animal … Read more Lower and Higher Invertebrates with their differences

Characteristics of Invertebrates

Characteristics of Invertebrates

Characteristics of Invertebrates Habitat They are found in seas, fresh water, air, land from snow to desert. 80% are found in terrestrial habitat. Most successful invertebrates of the lands are Arthropods. Protozoans are free-living, parasites or commensals. Sponges and Coelenterates are aquatic animals. Numerical Strength Among 1.25 million animal species, 95% (1.2 million) are invertebrates. … Read more Characteristics of Invertebrates

Differences between Invertebrates and Vertebrates

Differences between Invertebrates and Vertebrates

Differences between Invertebrates and Vertebrates The animal kingdom has been divided into two major groups: Invertebrates (Non-Chordates) and Vertebrates (Chordates). Invertebrates are those that do not possess a vertebral column or backbone while Vertebrates are those where vertebral column or backbone is present. These two groups have some differences as follows: S.N. Characteristics Invertebrates (Non-Chordates) … Read more Differences between Invertebrates and Vertebrates

Active Transport- Types and Significance

Types of Active Transport

Active Transport- Types and Significance To sustain life, many substances need to be transported into, out of, and between cells. In some cases, this can be accomplished through passive transport, which uses no energy. In many cases, however, the cell needs to transport something against its concentration gradient. In these cases, active transport is required. Active transport mechanisms require … Read more Active Transport- Types and Significance

Difference between active transport and passive transport

Difference between active transport and passive transport

Difference between active transport and passive transport Active and passive transport are the two main biological process which plays an important role in supplying nutrients, water, oxygen, and other essential molecules to cells and also by removing waste products. Both active and passive transport works for the same cause, but with different movement. Active transport … Read more Difference between active transport and passive transport

Haeckel’s Three kingdom System of Classification

Haeckel’s Three kingdom System of Classification

Haeckel’s Three kingdom System of Classification Classification is the arrangement of organisms into taxonomic groups known as taxa on the basis of similarities or relationships. Closely related organisms (i.e., organisms having similar characteristics) are placed into the same taxon. Organisms are categorized into larger groups based on their similarities and differences. The classification of living … Read more Haeckel’s Three kingdom System of Classification