Explanation

(a) Sexual reproduction in Rhizopus - By conjugation;

• It is usually between two strains of hyphae
•  Known as + and - plus and minus/ opposite mating types
• The hyphae come in contact
• And produce small projections of their walls
• Which develop into progametangia with several nuclei
• The two progametangia enlarge
• Each progametangium develops a cross wall to divide into two parts; the gametangium and suspensor
• Subsequently the wall dissolves/breaks; and their contents/nuclei fuse to form a zygote
• The zygote develops a thick wall to form a resistant zygospore
• The zygospore germinates during favourable / damp / wet condition
• Into hyphae which bear sporangia.

(b) (i) Name of hormone Adrenalin /Adrenaline

(ii) Part where hormone is produced Adrenal gland/Medulla.

(iii) Changes that must have taken place as a result of the hormone

• Increase in heart beat
• Increase in rate of respiration
• Arterioles of skin and alimentary canal constrict
• Dilation of blood vessels that cause more blood to flow to the muscles/heart/lungs
• Increase in muscular tone/voluntary muscles become tensed
• Glycogen is converted to glucose/increase in blood sugar level
• To produce more energy
• Dilation of pupils of the eye
• Momentary freight/fear/anxiety/heavy breathing
• Spleen releases more Red Blood Cells from its reserve
• Increase in blood pressure

(c) (i) Differences between excretion in flowering plants and excretion in humans. 

(ii) Organelles in plant cells responsible for excretion of metabolic wastes. 
 Mitochondrion/ mitochondria; chloroplast/ chloroplasts. 
 

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