Answer pls with explanation
Answer (1)
1. A – Leaf color depends on sunlight, since more sunlight means greener leaves.2. C – If population increases, competition will rise because more organisms need the same resources.3. A – Both soybeans and fungi will die because monocropping depletes soil nutrients and prevents fungi from thriving.4. D – Earth has a carrying capacity that limits survival, showing the effect of limiting factors.5. B – 20 birds in an 8m² pond means the population density is birds per square meter: 20/8 = 2.5, closest to 2.6. D – Species is the smallest classification for organisms that can interbreed.7. A – A habitat is where organisms live, like a forest or grassland (not a single organism or a single product).8. B – Birds are a class, not a species, so they are not a species.9. C – Coral reefs are threatened species due to environmental factors.10. D – Fast extinction caused by humans is called threatened species decline or "threatened."11. C – Deforestation is the cause of loss of forest land for factories and cities.12. A – Lack of oxygen is NOT a part of eutrophication; eutrophication is caused by excess nutrients, not by the lack of oxygen.13. D – All given statements (I, II, III, IV) about habitat destruction are true.14. C – Climate change happens when gases trap Earth’s reflected heat.15. B – The chance that the son’s son will also be hairy-eared in a classic sex-linked inheritance is 25%.16. A – Sex-linked inheritance means traits are more likely seen in one sex (like colorblindness or hemophilia, more in men).17. B – Genotype XxYyZz can produce blue eyes; polygenic means multiple gene pairs.18. B – The circulatory system cannot carry O2 and CO2 at the same time without help from the respiratory system.19. D – None of these; breathing rate changes many times per minute depending on physical activity, not a set number.20. B – Oxygen is the answer; lungs give off oxygen into the blood.21. A – When you exercise, oxygen supply to cells increases to meet muscle demands.22. C – Heart rate increases during vigorous activities.23. C – Tuberculosis is a disease of the respiratory system caused by bacteria.24. B – When ATP and NADPH are used up, less oxygen is produced as photosynthesis slows.
