JAMB Biology Past Questions & Answers - Page 16

Evolutionary trends generally involve changes that occur over time in a population or species. One commonly observed trend is an increase in genetic diversity within populations. Genetic diversity refers to the variety of genetic traits and variations present within a population. Increased genetic diversity can provide a population with a greater potential to adapt to changes in the environment, as it provides a wider range of genetic material for natural selection to act upon.

The alimentary canal, also known as the digestive tract, is a long tube that extends from the mouth to the anus and is responsible for the digestion and absorption of food. The organs that are part of the alimentary canal include the mouth, esophagus, stomach, small intestine, and large intestine. The liver produces bile, which aids in the digestion and absorption of fats, but its location is outside of the alimentary canal.

Social insects, such as ants, bees, wasps, and termites, exhibit complex social structures and behaviors that contribute to their survival and success as a colony. ocial insects organize themselves into specialized groups or castes, each with specific roles and functions. These castes can include workers, soldiers, drones, and queens. This division of labor and specialization enhances the efficiency of tasks within the colony, promoting survival and reproductive success.

All the options provided are evidence of evolution, which supports the idea that species have evolved and changed over time.

The membrane around the vacuole is known as Tonoplast. The tonoplast is the cytoplasmic membrane surrounding a vacuole, separating the vacuolar contents from the cell's cytoplasm. It is also known as Vacuolar membrane.