Which of the following groups of environmental factors are density-dependent?

• A. Food, salinity, accumulation of matabolites and light
• B. Temperature, salinity predation and disease
• C. Food predation, disease and accumulation of metabolites
• D. Temperature food disease and light

Millet , sorghum, maize and onions are common crops growth in Nigeria in the

• A. tropical rainforests
• B. sudan savanna
• C. montane forests
• D. sahel savanna

The crossing of individuals of the same species with different genetic characters is

• A. cross breeding
• B. polygenic inheritance
• C. non-disjunction
• D. inbreeding

Which of the following can cause shrinkage of living cells?

• A. Hypotonic solution
• B. Isotonic solution
• C. Deionized water
• D. Hypertonic solution

In which of the following biomes is the south western part of Nigeria located?

• A. Temperate forest
• B. Tropical rainforest
• C. Tropical woodland
• D. Desert

Seed plants are divided into

• A. trachephytes and ferns
• B. angiosperms and gymonsperms
• C. monocotyledons and dicotyledons
• D. thallophytes and bryophytes

Lack of space in a population could lead to an increase in

• A. water scarcity
• B. birth rate
• C. disease rate
• D. dought

Which of the following is a feature of the population pyramid of a developing country?

• A. long lifespan
• B. low birth rate
• C. low death rate
• D. short lifespan

Use the following information to answer the question below. I. Test tube containing cane sugar and water . ll. Test tube containing cane sugar and diluted acid. III. Test tube containing cane sugar and its degrading enzyme . The enzyme involved in the hydrolysis is

• A. rennin
• B. erepsin
• C. sucrase
• D. maltase

The inheritable characters that are determined by a gene located on the X-chromosome is

• A. recessive
• B. sex-linked
• C. homozygous
• D. dominant