JAMB Biology Past Questions & Answers - Page 8

Arteries are blood vessels that carry oxygenated blood away from the heart to various parts of the body.

The correct hierarchical organization of life from the smallest to the largest scale is as follows: cells, tissues, organs, organisms, populations, communities, ecosystems.

Implementing sustainable fishing practices is an example of conserving resources in an ecosystem. It identifies a practice that helps in preserving and maintaining the fish populations and the overall health of aquatic ecosystems.

Arthropods are characterized by the presence of a segmented body. This is a key characteristic of the phylum Arthropoda, which includes insects, spiders, and crustaceans. The other options are incorrect. Arthropods do not exhibit radial symmetry, they have an open circulatory system, and their exoskeleton is made of chitin, not bones.

The alimentary canal, also known as the gastrointestinal tract, is a long, continuous tube that extends from the mouth to the anus. It is responsible for the digestion and absorption of nutrients.
Oesophagus: The esophagus is a muscular tube that connects the mouth to the stomach.
Pancreas: The pancreas is both an endocrine and exocrine gland. From the digestive system perspective, it plays an important role in producing and secreting digestive enzymes into the small intestine.
Small intestine: The small intestine is the longest part of the alimentary canal and is divided into three sections: duodenum, jejunum, and ileum.