What is a sense organ? List four sense organs found in mammals. Explain why an athlete in a race would be given a glucose drink rather than a piece of bread. State five reasons why... What is a sense organ? List four sense organs found in mammals. Explain why an athlete in a race would be given a glucose drink rather than a piece of bread. State five reasons why water is important in the human diet. What is meant by the term food chain? Draw a food chain involving four trophic levels. Explain the flow of energy through the food chain. What is variation? State five advantages of variation within a species. Outline four differences between sex-linked characters and co-dominance. Describe the water cycle in the xylem tissue of flowering plants. State two differences between growth in plants and animals. Name two hormones involved in growth. Read more

Sense organs: eyes, ears, nose, skin. Glucose absorbs quickly for fast energy. Water promotes digestion, temperature regulation, nutrient transport, cell structure maintenance, waste removal. Food chain: energy flow decreases, starting with plants to top predators. Variation enhances survival. Plant growth indeterminate, animal determinate.

Sense organs are specialized organs that help perceive and respond to stimuli. Four sense organs in mammals include eyes, ears, nose, and skin. Athletes receive glucose drinks because glucose is quickly absorbed, providing rapid energy, unlike bread which digests slower. Water aids digestion, regulates temperature, transports nutrients, maintains cell structures, and removes waste. A food chain shows energy transfer from one organism to another. A simple one involves plants (producers), herbivores (primary), carnivores (secondary), and top predators (tertiary). Energy decreases at each level, primarily lost as heat. Variation is genetic diversity within a species, leading to improved survival, adaptability, evolution, disease resistance, and enhanced traits. Sex-linked traits are on sex chromosomes; co-dominance involves both alleles expressing equally. The water cycle in xylem involves water absorption, transportation, transpiration, and cohesion-tension. Plant growth is indeterminate and localized, while animal growth is determinate and uniform. Auxins and gibberellins are hormones involved in growth.