Zapisujemy na Twoim urządzeniu to, bez czego serwis nie działa, np. zalogowanie. Plików analitycznych użyjemy tylko za Twoją zgodą. Szczegóły w polityce prywatności.
Baza zadań
Wybierz umiejętność, rok lub poziom trudności. Każde zadanie ma klucz i schemat punktowania.
Pokazujemy tylko poziomy, dla których mamy zadania.
Znaleziono 1160 zadań
In a snapdragon cross, homozygous deep-red plants and homozygous white plants produce pink heterozygous offspring. Which explanation fits this observation? A. Complete dominance, because the offspring resemble one homozygote B. Incomplete dominance, because…
Penguins are birds and seals are mammals. Both swim using flattened forelimbs with corresponding humerus, radius and ulna bones. Which evolutionary interpretation best explains these observations? A. The swimming specialisations are homologous because the…
Which observation would support calling two structures analogous? A. They perform similar roles but their specialised forms arose independently B. They occur only in members of one species C. They have identical DNA sequences at every locus D. They differ in…
A healthy person’s core temperature falls below its regulated range. Which response increases heat production? A. Increased sweating B. Increased shivering C. Widening of skin arterioles D. Reduced skeletal-muscle activity
The great auk was a flightless seabird of the North Atlantic that became extinct in the nineteenth century. Which human pressure is recognised as the principal cause of its extinction? A. Unsustainable harvesting of individuals and eggs B. Nutrient enrichment…
Which changes are likely to reduce global biodiversity? I. Expansion of urban development into natural habitats II. Recovery of a degraded native wetland III. Conversion of native grassland into intensive cropland A. I and III only B. I and II only C. II and…
A shark and an ichthyosaur independently evolved streamlined bodies from ancestors with different body forms. Which interpretation best describes this similarity? A. Artificial selection producing homologous wings B. Divergent evolution producing homologous…
Which observation describes an abiotic influence on a freshwater community? A. Predatory beetles consuming larvae B. Dissolved oxygen concentration in the water C. Fungi infecting plant roots D. Competition between two algae species
A bracket fungus secretes enzymes into a dead log and absorbs the soluble products. Which nutritional mode is this? A. Photoautotrophy B. Saprotrophy C. Holozoic feeding D. Obligate mixotrophy
The schematic shows four climatic envelopes on temperature–precipitation axes. Which labelled envelope is most consistent with temperate forest? A. P B. Q C. R D. S