How well do you understand living things and their vital processes? Whether you are preparing for JAMB, WAEC, NECO and Post-UTME, these Biology past questions and answers cover such subjects as the chemistry of life, botany, evolution, genetics, ecology etc to help you know what to expect, improve your speed and confidence and be really prepared for the actual aptitude test.
Active transport differs from diffusion in that active transport
is a very fast process
allows the movement of substances against concentration gradient
takes place in both light and dark reaction of photosynthesis
occurs in both plant and animal tissues
Correct answer is B
Diffusion and osmosis depend only on the concentration gradient but active transport works against the concentration gradient.
Which of the following organelles is found only in plant cells?
Mitochondria
Ribosomes
Lysosomes
Plastids
Correct answer is D
Plastids are found only in plants and algae. One common type of plastid is the chloroplast.
The streaming movement of the cytoplasm within the Paramecium is known as
Transpiration
Digestion
Cyclosis
Osmosis
Correct answer is C
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.
What level of organization is Spirogyra?
System
Organ
Cell
Tissue
Correct answer is C
Unicellular organisms like the Amoeba, Spirogyra, etc. fall in the cellular level of organization.
Amoeba engulfs food particles by means of its
contractile vacuole
cytoplasmic membrane
food vacuoles
nucleus
pseudopodia
Correct answer is E
No explanation has been provided for this answer.