Correct Answer: D. stomach and gall bladder

Correct Answer: D. 5.20 x 10² kg m^-3

Explanation

\(V_T = 5m^3, m_1 = 2 \times 1 \times 10^3 = 2 \times 10^3\)

\(M_2 = 3 \times 8 \times 10^3 = 24 \times 10^3\)

M_T = 26 x 10³

D = \(\frac{m}{v} = \frac{26 \times 10^3}{5} = 5.2 \times 10^3\)

Correct Answer: B. 7

Correct Answer: C. lead

Explanation

The reactivity series allows us to predict how metals react. A more reactive metal displaces a less reactive metal from a compound. Lead is more reactive metal than copper hence, copper is displaced from copper solution by lead.

Explanation

(a)(i)Difference between intensive system and extensive system of livestock management

Intensive system of livestock management is a system in which livestock are kept under confinement at a high stocking rate with adequate provision for housing, feeding and health care

Whereas

Extensive system of livestock management is a system in which livestock are kept at low stocking rate with little or no provision for housing, feeding and health care.

(ii)Disadvantages of keeping livestock on free range system

• Exposes animals to infectious diseases.
• Exposes animals to predators.
• Difficulty in keeping records for individual animals.
• Exposes animals to pests.
• Feeding cannot be controlled.
• Breeding programme cannot be planned.
• Exposes animals to thieves.
• Animals dissipate energy in search of food and water.
• Characterized by slow growth rate and productivity.
• Exposes animals to environmental hazards and accidents.

(c) Ways in which ornamental plants are important

• Source of foreign exchange
• Source of income
• Source of employment
• Used to beautify the environment
• Used in landscaping
• Promote tourism
• Serve as wind break
• Some have medicinal value
• Used to demarcate boundaries
• Used for marking avenues
• Used for educational/research purposes
• Used for visual screening or concealing views to provide privacy
• Some ornamental plants are edible/used as food for humans/animals
• Leguminous ornamental plants fix nitrogen into the soil
• Some ornamental plants produce fragrance which give pleasure to people
• Help to reduce night blur on major roads to prevent accidents in the night
• Used in bouquets, garlands and wreaths
• The flowers of some ornamental plants are used in the preparation of dyes

Correct Answer: C Random mutations

Explanation

The Hardy-Weinberg principle asserts that allele frequencies in a population remain constant; for example, if 50% of people have blue eyes, then each successive generation will continue to have 50% of people with blue eyes as long as certain assumptions are met. The Hardy-Weinberg equilibrium assumes that within a population random mating occurs, no migration occurs, no mutations occur, no natural selection occurs, and the population is sufficiently large. If any of these assumptions are not met, the allele frequencies of the population will change, causing the population to evolve. For this question, all of the answer choices except Random mutations (remember there must be no mutations) are required assumptions for the Hardy-Weinberg equilibrium to be in effect.

Correct Answer: B. 25

Correct Answer: B. Secchi disc

Correct Answer: D. antithesis

Correct Answer: D. renounce all that one has