JAMB Biology Past Questions & Answers - Page 9

Irritability, also known as responsiveness or excitability, refers to the ability of cells to detect and respond to various stimuli or changes in their environment.

A disease vector is an organism that transmits disease-causing pathogens from one host to another. Female Anopheles mosquitoes can carry and transmit the Plasmodium parasite, which causes malaria. When an infected mosquito bites a person, it injects the parasite into the bloodstream, leading to the transmission of the disease.

The water activates special proteins, called enzymes, that begin the process of seed growth. 

The beaks of nectar sucking birds are long slender and pointed.

This helps in sucking nectar and also feeding insects and food to the young ones.

Birds like Hummingbirds have this kind of beaks.

Volvox is a polyphyletic genus of chlorophyte green algae in the family Volvocaceae. It forms spherical colonies of up to 50,000 cells.

Its plant body is coenobium and consists of large number of biflagellate, pear-shaped cells.

Similar cytoplasmic bridges link the cells of all volvocacean embryos.

I.e neighboring cells are often joined together by strands of cytoplasm.

The hump present in the camel helps them travel long periods without water to survive in the desert's harsh conditions.

Thus the hump acts as a fat reserve or an energy reserve.

Carolus Linnaeus is the father of taxonomy, which is the system of classifying and naming organisms.

One of his contributions was the development of a hierarchical system of classification of nature.

Today, this system includes eight taxa: domain, kingdom, phylum, class, order, family, genus, and species.

They typically function as protection for the flower in bud, and often as support for the petals when in bloom.

Congenital hypothyroidism, previously known as cretinism, is a severe deficiency of thyroid hormone in newborns.

It causes impaired neurological function, stunted growth, and physical deformities