Biology Past Questions And Answers
A flower that has both stamens and pistils is said to be
- A. staminate
- B. pistillate
- C. perfect
- D. imperfect
Viruses differ from all forms of life because they
- A. have thick cell wall
- B. feed on waste products of other organisms
- C. causes infectious diseases
- D. require other living cells to multiply
Diffusion is most effective in living organisms, when the surface area is
- A. large and the thickness is also large
- B. small while the thickness is large
- C. large while the thickness is small
- D. the same as its thickness.
Red blood cells were found to have burst open after being placed in distill for an hour. This phenomenon is known as
- A. plasmolysis
- B. diffusion
- C. haemolysis
- D. wilting
The illustration below is a genetic diagram. Study it and answer the question
- A. Genetic square
- B. Inheritance diagram
- C. Punnett square
- D. Genetic cross
(a) With the aid of annotated diagrams only, outline the water cycle.
(b) Describe an experiment to show that water is conducted in the xylem tissue of flowering plants.
View Discussion (0)WAEC 2009 THEORYWhich of the following is likely to encourage inbreeding in plants?
- A. Dioecious
- B. Protandrous
- C. Monoecious
- D. Hermaphrodite
Pawpaw seeds collected from a tree with many desirable agronomic qualities did not give rise to plants of desirable character as the parent because
- A. seeds are not reliable for propagating plants
- B. uncontrolled out-crossing can introduced unwanted variability
- C. vegetative propagation is best form of reproduction of all crop
- D. seeds were not physiologically mature at the harvest
The cell membrane of a cell is said to be semi-permeable because
- A. it allows only large molecular substances to pass through it into the cell
- B. it is actively involved in energy production in the cell
- C. it actively allows all substances to pass through it by diffusion
- D. it is actively selective in allowing substances pass through it
Which of these plants has an emerginate apex?
- A) Bauhinia
- B) Pistia
- C) Ixora
- D) Musa