2000 - JAMB Biology Past Questions and Answers - page 1

The diagram likely depicts a developing embryo. Based on the labels: * I likely represents the developing brain. * II could represent the developing eye. * III is likely the developing ear, which contains structures for feeling (like the cochlea for hearing and the semicircular canals for balance). * IV could be part of the developing limbs. Therefore, the part that will develop into an organ for feeling is III.

The image shows an insect. The part labeled II points to the wing of the insect. Therefore, the correct answer is the fore wing.

The fins that control steering, balancing, and changes in direction and pitch in fish are the anal and pelvic fins.

The coelom is a fluid-filled body cavity found in many animal groups. * **Coelenterata (also known as Cnidaria):** These animals, such as jellyfish and corals, lack a true coelom. They have a simple sac-like body plan with a single opening that serves as both mouth and anus. The space within the body is called the gastrovascular cavity. * **Mollusca:** Molluscs (e.g., snails, clams) have a coelom, although it is often reduced and surrounds the heart. * **Reptilia:** Reptiles (e.g., snakes, lizards) are advanced animals that possess a coelom. * **Arthropoda:** Arthropods (e.g., insects, spiders) possess a coelom

Mammals are unique among vertebrates in possessing a scrotum. The scrotum is an external pouch of skin that houses the testes, providing a cooler environment necessary for sperm production. * **A.** The presence of pentadactyl limbs is a characteristic of all tetrapods, not just mammals. * **B.** Parental care is seen in many vertebrates, including birds and reptiles, not just mammals. * **D.** Pulmonary circulation is found in all vertebrates with lungs.

The growth hormone is secreted by the pituitary gland, which is located in the head region.