Free Biology notes-Biology notes with diagrams and practicals

                              Hippocampus #Comments  Habit and Habitat: Hippocampus is a vertically swimming fish. It has a horse-shaped head and snout.                                                                                                                         FIG: LABELLED DIAGRAM OF HIPPOCAMPUS. It is commonly called as a sea horse. The head is produced into a long tubular snout. It is covered by an exoskeleton of bony plates or rings. The tail is prehensile. The operculum is fused with the body wall posteriorly and ventrally leaving a branchial aperture gill opening. Pelvic and caudal fins are abse...

                              Echeneis  #Comments Habit and Habitat:   Echeneis is a common Marine fish. It swims in water feeding, on small fishes. It attaches itself through the adhesive disc to boats, sharks, bony fishes, sea turtles, and other marine animals.                                                       Echeneis are commonly called suckerfish. A sucking disc is found on the head. The first dorsal fin is modified into a suctorial disc for attachment. It is oval in shape and is provided with numerous transverse furrows Fish applies disc against other fishes thus creating a partial vacuum by operating the suction action. The second dorsal fin and anal fin are elongated and opposite to each other. The ventral fin has one spine. Caudal fin is bilobed. Commonly se...

CANCER ABOUT # What is Cancer ? Cancer is the uncontrolled growth of abnormal cells in the body. These abnormal cells crowd the normal cells, making it difficult for the body to function properly. Eventually, those abnormal cells can form into big mass, called tumors. These tumours can either be non-cancerous (Benign) or cancerous (Malignant). Malignant tumor:   The word "Cancer" itself refers to malignant tumors.  As the more dangerous of the two tumor types, malignant tumors multiply before penetrating, and harming the body's tissues, leading to serious health issues and possibly premature death.  Receiving regular medical check up is incredibly important, so that potential malignancies can be spotted and treated as early as possible. Benign tumor:   Unlike malignant tumors, benign tumors will not invade neighbouring tissues. But they can also grow in size and cause various health problems.  Eventually l, a benign tumor may press against vital structures in yo...

                                      ARCHAEOPTERYX                                                                                                                                                                                                SCIENTIFIC  CLASSIFICATION                                          ...