Zadanie 1
Which feature of a cold-water seal most directly reduces heat loss to highly thermally conductive water? A. A streamlined outline B. A thick insulating blubber layer C. Large canine teeth D. A sensitive whisker
Biology SL Paper 1A, November 2025, TZ1
Zadania wzorowane na pytaniach z tego arkusza: te same umiejętności, format i punktacja, inne dane i kontekst. Treści arkusza IB nie publikujemy.
W bazie 28 zadań z tego arkusza, razem 28 punktów, każde z kluczem i schematem punktowania.
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Dodaj cały arkusz do zestawuZadanie 2
Which labelled structure is a phospholipid? A. Structure A B. Structure B C. Structure D D. Structure C
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Zadanie 3
Which substance–route pairing correctly describes movement through a cell membrane? A. Testosterone — directly through the lipid bilayer B. Starch — through an aquaporin C. A sodium ion — freely through the hydrophobic core D. A large antibody — through a…
Zadanie 4
Which pair places an anabolic process first and a catabolic process second? A. Protein hydrolysis; cellulose synthesis B. Glucose oxidation; protein synthesis C. Glycogen synthesis; protein hydrolysis D. Lipid digestion; starch synthesis
Zadanie 5
Which factors limit photosynthesis near100light units and on the lower curve near700units? A. 100: CO₂; 700: light B. 100: temperature; 700: light C. 100: light; 700: oxygen supply D. 100: light; 700: CO₂
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Zadanie 6
Which row demonstrates degeneracy of the genetic code? Row | mRNA codons | Encoded amino acids P | AAA GCU AAA | Lys–Ala–Lys Q | AUG UGG GAA | Met–Trp–Glu R | UCU GGA UCC | Ser–Gly–Ser S | UAC GAC AAC | Tyr–Asp–Asn A. P B. Q C. R D. S
Zadanie 7
In which cell could a new mutation be transmitted directly to a child through fertilization? A. A sperm cell B. A liver cell C. A mature skin cell D. A pancreatic beta cell
Zadanie 9
A membrane protein hydrolyses ATP while transporting calcium from low concentration to high concentration. What type of protein is it? A. An adhesion glycoprotein B. A water channel C. An active-transport pump D. A passive calcium pore
Zadanie 10
Which typical mature human cell has the largest volume? A. Sperm cell B. Erythrocyte C. Egg cell D. Small lymphocyte
Zadanie 11
Which pointer identifies a dendrite? A. Q B. S C. P D. R
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Zadanie 12
Identical red blood cells were placed in solutions P–S. Which conclusion is supported by their model appearances? A. Q is more dilute than P B. S has a higher effective solute concentration than Q C. R is more concentrated than S D. P is more dilute than S
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Zadanie 13
The names of four mammals are shown. Which pair belongs to the same genus? P: Panthera pardus Q: Neofelis nebulosa R: Panthera onca S: Leopardus pardalis A. P and R B. Q and S C. P and S D. R and S
Zadanie 15
Which property helps blood flow through a vein when surrounding skeletal muscle contracts? A. A very rigid non-compressible wall B. A flexible wall that can be compressed C. A wall consisting only of a single fenestrated layer D. A lumen always narrower than…
Zadanie 16
What acts as the receptor in a withdrawal reflex initiated by a sharp object? A. The contracting arm muscle B. The pituitary gland C. A motor neuron terminal D. A sensory nerve ending in the skin
Zadanie 17
What is a major role of a helper T lymphocyte during an adaptive immune response? A. Activating other immune cells through signalling B. Secreting the bulk of circulating antibody directly C. Engulfing every extracellular pathogen by phagocytosis D. Producing…
Zadanie 18
A public-health text classifies rabies as a zoonosis. What does this classification mean? A. It can pass from a non-human animal reservoir to humans B. It can occur only in a zoo C. It is necessarily transmitted only between humans D. It consists of animal…
Zadanie 19
Identify the flower part indicated by Y. A. Anther B. Sepal C. Stigma D. Style
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Zadanie 20
The pedigree concerns an X-linked recessive condition. Let XN be the unaffected allele and Xn the condition-associated allele. Which genotype or genotypes are possible for Z? A. XnXn only B. XNXn only C. XNXN or XNXn D. XNXN or…
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Zadanie 21
The graph models exercise interrupted by rest at minutes30–50 and80–100. Which response can contribute to the temperature falls during rest? A. Contraction of skeletal muscles in shivering B. Increased blood flow through vessels near the skin surface C.…
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Zadanie 22
Two populations of a small mammal become separated by a newly formed broad river. Which consequence directly supports their later divergence into species? A. Artificial selection by farmers B. Reduced gene flow and reproductive isolation C. Immediate…
Zadanie 23
Which intervention is most likely to reduce biodiversity loss in a degraded native habitat? A. Increasing fragmentation by adding roads B. Replacing native vegetation with one introduced tree species C. Removing protected-area restrictions on habitat clearance…
Zadanie 24
Which observations provide evidence for evolutionary change? I. A shared underlying forelimb bone pattern in bats and whales. II. Heritable changes produced by selective breeding of crop plants. III. The claim that every acquired bodily change is automatically…
Zadanie 25
Which description correctly characterizes holozoic nutrition? A. Autotrophic, with external digestion B. Heterotrophic, with internal digestion C. Saprotrophic, with only extracellular digestion outside the body D. Photoautotrophic, without ingestion
Zadanie 26
Which interaction can impose costs on both species involved? A. Mutualism B. Predation C. Parasitism D. Competition for a limited resource
Zadanie 27
Which pair can each occupy the tertiary-consumer level in at least one chain shown? A. Geese and mussels B. Ducks and eagles C. Zooplankton and small fish D. Algae and large fish
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Zadanie 28
Which two labelled carbon transfers represent respiration? A. Q and S B. P and R C. P and Q D. R and S
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Zadanie 29
Male birds display conspicuous crests during elaborate courtship performances. Which process can favour this trait? A. Genetic drift must eliminate it B. Artificial selection by humans C. Sexual selection D. Selection caused only by soil chemistry
Zadanie 30
The two schematic maps show predicted changes in winter-temperature zones for the same northern-hemisphere region. What shift in tree distributions is most likely if other requirements remain suitable? A. Every tree species remains restricted to its current…
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