43
The mangrove swamp in Nigeria is restricted to the
- A. sahel savana
- B. sudan savanna
- C. guinea savanna
- D. tropical rain forest
44
The highest level of ecological organization is the
- A. ecosystem
- B. population
- C. biosphere
- D. niche
45
A crucible of 5g weighed 10g after filling with fresh soil. it is then heated in an oven at 100°C for 1 hour. After cooling in a desiccator, the weight was 8g.The percentage of water in the soil is
- A. 80%
- B. 60%
- C. 20%
- D. 40%
46
One adaptation shown by hydrophytes in freshwater habitats is the
- A. leaves reduced to spines
- B. poor development of roots and xylem tissues
- C. waxy cuticle on shoot surface
- D. well developed roots and supporting system
47
Which of the following is an example of parasitism?
- A. fungi growing on a dead tree branch
- B. a squirrel living in an abondoned nest of a bird
- C. mistletoe growing on an orange tree
- D. cattle egrets taking ticks from the body of cattle
48
The causative agent of bird flu is a
- A. protozoan
- B. virus
- C. bacterium
- D. fungus
49
The increasing order of the particle size in following soil type is
- A. clay → sand → silt →gravel
- B. silt → sand → clay → gravel
- C. clay → silt → sand → gravel
- D. silt → clay → sand → gravel
50
The organs that will be most useful to giant African rats in finding their way in underground habitats are the
- A. vibrissae
- B. nostrils
- C. eyes
- D. tails