2018 - WAEC Biology Past Questions and Answers - page 1

Swedish naturalist, Carolus Linnaeus, was the man behind the present day classification of plants and animals.

The prothorax contains the first pair of legs in the arthropods. It's the first of the three segments of the thorax.

Unicellular organisms like the Amoeba, Spirogyra etc fall in the cellular level of organisation.

Cyclosis is also called Cytoplasmic streaming. It is defined as the streaming rotary motion of the protoplasm within certain cells and unicellular organisms. Paramecium is an example of a unicellular organism.

Plastids are found only in plants and algae. One common type of plastid is the chloroplast.

Diffusion, as well as osmosis depends only on concentration gradient but active transport works against concentration gradient.

From the first diagram, you notice the roots of the plants bending towards the porous water pot, hence this is a form of response in the direction of the stimuli of the water. This is a form of hydrotropism.

The roots of the plants in diagram 1 bend towards the porous clay pot while growing and the well watered soil sees the plants growing straight and erect. The roots of the plants are positively hydrotropic (respond towards the pull of water positively).

The odontoid process is a projection of the axis vetebra. It is seen at its point of joining with the body.