2014 - JAMB Biology Past Questions and Answers - page 1

The correct answer is A. Heart, because it is the most complex organ among the options. * **Heart:** A heart is a complex organ composed of multiple tissues (muscle, connective, nervous, etc.) that work together in a coordinated manner to perform a specific function (pumping blood). It is an organ-level of organization. * **Hair:** Hair is a tissue composed primarily of dead cells. It is a tissue-level of organization. * **Euglena:** Euglena is a single-celled organism (a protist). It exhibits a cellular level of organization. * **Hydra:** Hydra is a simple multicellular organism that has tissues and some simple organs, but it is not as complex as the heart. It is an organ-level of organization. The cellular levels

The dominance of seed plants on land is primarily attributed to efficient seed dispersal. Here's why: * **Efficient seed dispersal:** Seeds enable plants to colonize new areas, escape competition with the parent plant, and survive harsh conditions. Various dispersal mechanisms (wind, water, animals) increase the chances of successful reproduction and survival. * **Other options:** * **A:** Seed plants do not have motile gametes. * **B:** All plants photosynthesize, not just seed plants. * **D:** While water is essential for all plants, it is not the primary reason for the dominance of seed plants.

The dental formula i2/1, c0/0, pm3/2, m3/3 indicates the type of teeth and their arrangement in one half of the upper and lower jaws of an animal. * **i** represents incisors * **c** represents canines * **pm** represents premolars * **m** represents molars The formula i2/1, c0/0, pm3/2, m3/3 means the animal has: * 2 incisors in the upper jaw and 1 in the lower jaw in one half. * 0 canines in both upper and lower jaws. * 3 premolars in the upper jaw and 2 in the lower jaw in one half. * 3 mol