Biology Past Questions And Answers
Excretory products in plants responsible for the discoloration of flowers are called__________
- A. alkaloids
- B. tannins
- C. anthocyanins
- D. resins
Which of the following water pollutant may contain organisms that cause dysentery?
- A. Pesticides
- B. Sewage
- C. Industrial wastes
- D. Fertilizers
Which of the following is the effect of using artificial pollination in plant breeding?
- A. Production of healthy crops
- B. Lengthening the maturity time of crops
- C. Making crops susceptible to disease
- D. Improvement of the variety of crops
The resolution of a microscope refers to its power to
- A. increase an object's apparent size
- B. distinguish clearly between two objects
- C. scan the surface of an object
- D. focus on an object
What is the tissue responsible for transporting water and minerals from the roots to the rest of the plant?
- A. Xylem
- B. Epidermis
- C. Parenchyma
- D. Phloem
Which of the following processes removes carbon from the atmosphere?
- A. putrefaction
- B. photosynthesis
- C. volcanic eruption
- D. burning of fuels
A population of dingos finds a new habitat to exploit due to the disappearance of one of their natural predators. They reproduce sexually and at random. Their population is supplemented by dingos from other packs entering their pack. They are able to hunt multiple species and have plenty of food. They are healthy and free of diseases. How do we know the assumptions for the Hardy-Weinberg equilibrium have been violated?
- A. Sexual reproduction is not occurring
- B. The population size is not infinitely large
- C. Other dingos are migrating to the population
- D. They are free of disease
Oozing out of water from the leaves of plants in a humid environment is known as
- A. transpiration
- B. osmosis
- C. pinocytosis
- D. guttation
Which enzymes are contained in the pancreatic juice?
- A. Ptayalin, lipase and pepsin in
- B. Maltase, erepsin and tryps
- C. Renin, sucrase and lipase
- D. Amylase, lipase and trypsin
An indigenous method of renewing and maintaining soil fertility is by
- A. clearing farms by burning
- B. planting one crop type
- C. adding inorganic fertilizers yearly
- D. crop rotation and shifting cultivation