Jamb Biology 2001 Past Questions and Answers

Question 26:

• JAMB 2001

Salts and water are absorbed in the roots and transported to leaves by

A. Diffusion through the xylem tissues
B. Osmosis through the phloem tissues
C. Diffusion through the phloem tissues
D. Osmosis through the xylem tissues

Question 27:

• JAMB 2001

The number of plants species obtained from a population study of a garden is as follows: Guinea grass (15), Ipomea spp (5), sida spp (7) and Imperata spp (23). What is the percentage of occurrence of Imperata spp?

A. 35%
B. 16%
C. 46%
D. 23%

Question 28:

• JAMB 2001

Carbon (IV) oxide content of the atmosphere is least affected by

A. Cutting down and clearing of forests
B. Forest fires
C. Burning of fossil fuels
D. Plant and animal respiration

Question 29:

• JAMB 2001

The factor that least affects food shortages in sub-saharan Africa is

A. Flooding
B. Pests
C. Mixed-cropping
D. Drought

Question 30:

• JAMB 2001

The epiphytic habitat can best be described as

A. Arboreal
B. Estaurine
C. Aquatic
D. Terrestrial