Zadanie 8, Paper 2, maj 2026, TZ3, Biologia IB HL
Wzorowane na: Biology HL Paper 2, May 2026, TZ3, pytanie 8. Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Zadanie
Polecenie
Carbon chemistry underlies the origin, storage and sustainable production of biological material.
(a) Outline environmental conditions on early Earth that favoured diverse carbon compounds.
(b) Describe practices that can make agriculture sustainable.
(c) Explain how starch structure suits storage within plant cells.
Korepetytor AI
Nie wiesz, jak ruszyć? Korepetytor zna to zadanie i poprowadzi Cię krok po kroku, bez gotowca.
3 rozmowy · bez karty · Zaloguj się
Sprawdź się
Odpowiedz i oceń, jak poszło. Klucz odsłoń dopiero, gdy masz swoją odpowiedź.
Jak poszło Ci z tym zadaniem?
Wybierz ocenę: zapamięta ją ta przeglądarka, a z darmowym kontem zobaczysz ją na każdym urządzeniu.
Pokaż rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
(a) Little free atmospheric oxygen allowed reducing conditions. ✔
Atmospheric carbon dioxide was abundant. ✔
Methane was abundant in relevant early-atmosphere models. ✔
Temperatures were higher than today. ✔
More ultraviolet radiation reached the surface. ✔
Electrical discharges supplied reaction energy. ✔
Volcanism or hydrothermal vents provided reactive settings. ✔
There was no protective ozone layer. ✔
(b) Prevent loss of soil through erosion. ✔
Limit tillage, exposed soil or overgrazing. ✔
Use direct drilling, cover crops or contour cultivation. ✔
Retain and recycle nutrients instead of losing them in runoff. ✔
Build soil organic matter and carbon. ✔
Rotate crops or include nitrogen-fixing legumes. ✔
Use compost, manure or biochar, OR reduce dependence on synthetic fertilizers. ✔
Reduce unnecessary pesticide use. ✔
Reduce routine antibiotic use in livestock. ✔
Protect pollinating organisms. ✔
Reduce fossil-energy demand or use renewable sources. ✔
Lower methane emissions from ruminant systems. ✔
Conserve irrigation water and support the water cycle. ✔
(c) Starch is a polysaccharide. ✔
It contains many alpha-glucose units. ✔
Condensation reactions form its links. ✔
Adjacent glucose units are linked from C1 to C4, OR the links are 1,4-glycosidic bonds. ✔
Branches use 1,6-glycosidic links. ✔
Amylose is unbranched while amylopectin is branched, OR amylose has only 1,4 links whereas amylopectin has both 1,4 and 1,6 links. ✔
Its compact form stores much material in little space. ✔
Insoluble granules have little osmotic effect. ✔
Molecules remain within the cell because they are too large to cross the plasma membrane, OR because their hydrophilic nature prevents ready passage through its lipid interior. ✔
Many glucose residues provide a substantial energy reserve. ✔
Glucose units can be added or removed as needed. ✔
Hydrolysis readily mobilizes glucose, OR branches make glucose units readily accessible for removal. ✔
Schemat punktowania
(a) Award any 4 points, maximum 4. (b) Award any 4 points, maximum 4. (c) Award any 7 points, maximum 7. Quality: award 1 additional mark for a response across all parts that is readily understandable, concise and largely free of repetition or irrelevant material. Judge quality separately from content. Maximum 16 overall.