The avian respiratory system is different, physically from the mammalian respiratory system, both in its ability to exchange gas as efficiently... View Article
In order to prevent dessication (water loss), insects have an impermeable exoskeleton and an internal gas exchange system. As this exoskeleton is... View Article
Nematodes have an unsegmented body whereas annelids are metamerically segmented. Nematodes are pseudocoelomate, whereas annelids have a true... View Article
Annelids possess a closed circulatory system. Blood is circulated through blood vessels, capillaries and the heart. Blood glands are present on... View Article
Reflexes are involuntary responses to peripheral nerve stimulation. A reflex that is mediated by cranial nerves is called cranial reflex such as... View Article
Yes, knee jerk is a reflex action. It is also known as the patellar reflex. A tap on the patellar tendon causes contraction of the quadriceps... View Article
Flatworms are hermaphrodites, i.e. sexes are not separate. They have both male and female sexual organs. Also Check: Do Flatworms Have A... View Article
Planaria is a free-living freshwater flatworm. Planaria belongs to the class Turbellaria, which mostly contains free-living species. Most of the... View Article
Some of the flatworms such as planaria possess high regeneration capacity. They can regenerate the damaged parts. Also Check: Do Flatworms... View Article
The major unifying feature of Aschelminth is the presence of pseudocoelom. In pseudocoelom, scattered pouches of mesoderm are present between... View Article
Aschelminthes are called pseudocoelomates because they do not possess true coelom. The mesoderm is present as scattered pouches between ectoderm... View Article
No, earthworms are coelomates. They possess true coelom, which is lined by mesoderm. They belong to the phylum Annelida. Also Check: What... View Article
Yes, some of the nematodes live as parasites in the human intestines. E.g. Ascaris lumbricoides (roundworm), Enterobius vermicularis (pinworm),... View Article
Larynx is present between the pharynx and trachea of the human respiratory system. The main function of the larynx is sound production. It... View Article
When the body cavity is not lined by mesoderm and is present as scattered pouches between ectoderm and endoderm, it is called pseudo coelom.... View Article
The two basic factors of evolution are natural selection and variation, on which natural selection operates. Also Check: How Does Variation... View Article
In absence of allolactose or lactose, the repressor binds to the operator and inhibits the transcription of the operon by RNA polymerase. Lactose... View Article
Mendelian traits are those traits, which are governed by a single gene having two alleles, with one completely dominant over the other. Some of... View Article