Compare and contrast metals and non-metals, define crop variety, list factors for crop selection, and compare organic and inorganic compounds.

here are the solutions to the questions from the image:

c) Metals vs Non-Metals:

• (i) Differentiation by appearance:
  • Metals have a shiny, lustrous appearance.
  • Non-metals generally have a dull, non-reflective appearance (except iodine and graphite).
• (ii) Two uses of semi-metals (metalloids):
  1. Used as semiconductors in manufacturing electronic microchips, transistors, and solar cells (e.g., Silicon).
  2. Used in making specialized alloys to improve thermal and chemical resistance.

d) Crop Selection:

• (i) Definition of crop variety: A crop variety is a specific group of cultivated plants within a single species that selected traits distinguish clearly from other varieties, which remain stable when propagated.
• (ii) Three factors to consider when selecting a suitable crop variety for cultivation:
  1. Climatic and ecological conditions of the area (rainfall, temperature).
  2. Resistance of the variety to local pests and diseases.
  3. Maturity period and potential yield of the variety.

Question 3

b) Comparison between organic and inorganic compounds:

• (i) Melting point:
  • Organic Compounds: Generally low melting points.
  • Inorganic Compounds: Generally high melting points.
• (ii) Boiling point:
  • Organic Compounds: Generally low boiling points.
  • Inorganic Compounds: Generally high boiling points.
• (iii) Solubility in water:
  • Organic Compounds: Mostly insoluble in water (soluble in organic solvents).
  • Inorganic Compounds: Mostly soluble in water (insoluble in organic solvents).
• (iv) Conductivity:
  • Organic Compounds: Non-conductors of electricity (do not ionize).
  • Inorganic Compounds: Good conductors when molten or in aqueous solution.
• (v) Biodegradability:
  • Organic Compounds: Mostly biodegradable.
  • Inorganic Compounds: Generally non-biodegradable.

c) Explanation of terms in ruminants:

• (i) Gestation period: The period from successful conception/fertilization to the birth of the offspring (pregnancy duration).
• (ii) Heat period: The period during the estrus cycle when the female ruminant is sexually receptive to the male for mating.
• (iii) Parturition: The physiological act of giving birth or bringing forth young ones at the end of the gestation period.