Online Biology Notes for students
Locomotion in Hydra Hydras are essentially sessile animals. They live attached by their pedal discs to objects in the water. Brown and green hydras can remain fixed at one spot for a considerable time, but green hydras often move about from place to place by several ingenious devices. They twist about or …
Read moreHydra- Locomotion, nutrition, respiration, excretion, nervous system, behaviours
Some insects are helpful for agriculture and human welfare but some insects are pests of our crop and some insects have poisonous nature. Here we study some beneficial and harmful importance of insects. A- Beneficial Insects 1- Insects and insects product in the food Insects are an abundant food supply for several …
Read moreEconomic Importance (Beneficial and Harmful) of Insects
Parasitic adaptation of flatworms Adaption in parasites to survive in the environment of a body of the host is called parasitic adaptation. Mainly flat-worm are parasitic except Turbellaria, so they are adapted for parasitic nature. There are two types of parasitic adaptation to suit their parasitic mode of life. Morphological adaptations Morphological …
Read moreParasitic adaptation of flatworms and diseases caused by flatworm
Taxonomy was recognized as a general subject only in 1813 by A.P.de Candolle. His famous work describes in the book of which name is Theorie elementaire de la botanique. Taxonomy is a combination of Greek words ‘taxis’ means arrangement and ‘nomos’ means rules or law. Taxonomy deals with the identification, nomenclature, and …
Read morePlant Taxonomy- Definition, History, Classification, Types
Although some microbes are beneficial for human welfare, some of them are used for the production of bio-fertilizer, some are useful for industries, yet there are several microorganisms, which are the cause of plant disease. Such as some viruses, bacteria, mycoplasma, and fungi can cause several types of disease in plants. Some …
Read morePlant diseases caused by Virus, Bacteria, Mycoplasma, Fungi
Locomotory Organelles in Protozoa Protozoan shows different verities of locomotory organs, such as pseudopodia, pellicular contractile structure, flagella, cilia. 1. Pseudopodia Pseudopodia are false feet of some Sarcodina protozoans such as Amoeba. Pseudopodia are a temporary structure form by streaming of cytoplasm. It is comprised of ectoplasm and endoplasm both. Pseudopodia are four …
Read moreProtozoa- Locomotory organelles and locomotion methods
Types of parasitism in protozoa Before discussing parasitism in protozoa we have to understand the parasite and parasitism. We know that parasites can be defined as organism exists on another organism, parasites are two types one is ectoparasites, living on external body organism and another is endo-parasites, living inside the body of …
Hydra are inconspicuous freshwater relatives of corals, sea anemones, and jellyfish that are classified under the phylum Cnidaria, Class Hydrozoa, Order Anthomedusae/Anthoathecata, and Family Hydroidea. It is essentially a sedentary organism living attached to stones, pebbles, and water plants, but can get released from the substratum and swim. The name Hydra was …
Read moreHydra- Habit, Habitat, External Morphology, Internal Structures
What is Visceral leishmaniasis (Kala-azar)? Visceral leishmaniasis is sometimes known as systemic leishmaniasis or kala-azar. Kala-azar also is known as black fever or Dumdum fever in Asia. It usually occurs 3 to 6 months after being bitten by a sandfly. It primarily infects the reticuloendothelial system. It damages internal organs, such as …
Read moreVisceral leishmaniasis (Kala-azar)- Causes, Lab diagnosis, Treatments
What is Cysticercosis? Cysticercosis refers to the tissue infection caused by the metacestode, or larval stage, of Taenia solium. It is acquired by the accidental ingestion of T. solium eggs. It is endemic to many parts of the developing world, including Latin America, Asia, and sub-Saharan Africa. Cysticercosis is the most common …
Read moreCysticercosis- Clinical manifestations, diagnosis, treatment