0610 Biology November 2025 Question Paper 23

What is a characteristic of all living organisms?

What are the two parts of the scientific name of an organism?

A palisade cell and a neurone are observed under a light microscope. Which cell component is found only in the palisade cell?

In a human, the diameter of the aorta as it leaves the heart is 36 mm. The thickness of the wall of the aorta at this point is 9 mm. What is the diameter of the lumen of the aorta at this point?

Diffusion may be defined as the net movement of particles from a region of their ......1...... concentration, to a region of their ......2...... concentration, where movement is ......3...... a concentration gradient. Which words complete gaps 1, 2 and 3?

Cylinders of potato tissue were placed in sugar solutions of different concentrations and left overnight. The lengths of the potato cylinders were measured before and after they were placed in the sugar solutions. The graph shows the results of the investigation. 0.1 0.2 0.3 0.4 0.5 1.2 1.1 1.0 0.9 0.8 ratio of final length to initial length sugar solution concentration / moles per dm3 In which sugar solution concentrations did the potato cells gain water?

The diagrams show the same mass of oil arranged in drops of different sizes at the same temperature. In which combination of oil drop size and enzyme will the oil be digested the fastest?

Which substance contains magnesium ions?

The diagram shows part of a cross-section of a leaf. Which part is the xylem?

The diagram shows an experiment to investigate gas exchange in a leaf. leaf substance that absorbs carbon dioxide black cover ink drop In which direction does the ink drop move and for what reason? direction reason

What is an example of chemical digestion?

The diagram shows a villus. X Which row shows the name and function of the part labelled X? name function

Which environmental conditions will result in the highest rate of transpiration? high air humidity very windy low air temperature

Which statements describe sources and sinks? Palisade mesophyll cells only act as sinks. Roots can act as sinks. Sink cells only receive glucose from the phloem. Spongy mesophyll cells can act as sources.

What is a feature of veins?

The diagram shows a section through a human heart. Which structure is an atrioventricular valve in the right side of the heart?

What is an example of active immunity?

Which changes cause expiration? external intercostal muscles diaphragm

What shows the pathway of urea from where it is produced to where it is excreted?

Which row shows the state of the ciliary muscles and suspensory ligaments when the eye is focusing on a near object? ciliary muscles suspensory ligaments

Events that occur at a synapse are listed. They are not in the correct order. An impulse is stimulated in the next neurone. An impulse stimulates the release of neurotransmitter molecules from vesicles into the synaptic gap. Neurotransmitter molecules bind with receptor proteins on the next neurone. The neurotransmitter molecules diffuse across the gap. What is the actual sequence of events?

Which actions can prevent a mammal’s internal body temperature falling too low?

The diagram shows the position of some of the human endocrine glands. X Which hormone is secreted by X?

Which row shows the correct speed and duration for the type of control? type of control speed of action duration of effect

A student writes four statements about auxin. Auxin becomes more concentrated on the lower side of a horizontal stem. Auxin becomes more concentrated on the side of the shoot that has more light. Auxin is made in the shoot tip. Auxin prevents cell elongation in the shoot. Which statements describe what happens during chemical control of plant growth?

What can antibiotics treat?

The diagram shows two methods of pollination, V and W. The two flowers are on different plants of the same species. V W A student made three conclusions about these two methods of pollination. Method V will produce genetically identical offspring. Method W will produce genetically different offspring. Method W increases the ability of the species to adapt to its surroundings. Which conclusions are correct?

The diagram shows the blood supply between a fetus and a placenta. capillary in the placenta fetus umbilical artery umbilical cord umbilical vein placenta key direction of blood flow Which row shows the concentration of substances in the umbilical artery and umbilical vein? umbilical artery umbilical vein

Which hormone is produced by cells in the placenta of a developing fetus?

What are alleles?

Polydactyly in cats is a dominant condition that causes affected cats to be born with extra toes. What is the probability of two cats that are heterozygous for polydactyly having an offspring with no extra toes?

Which statement describes red-green colour blindness?

Four features of cell division are listed. Haploid cells are produced. New cells are genetically identical. It is a reduction division. It results in variation. Which features would be associated with meiosis?

Which term is used to describe a characteristic that helps an organism to survive and reproduce in its environment?

Which process removes carbon dioxide from the atmosphere?

The diagram shows part of the nitrogen cycle. nitrogen in the atmosphere plant and animal waste proteins in animals and plants nitrate ions in soil ammonia amino acids in plants and animals process X process Y What are the names of process X and process Y? X Y

The graph shows how the population of the world increased from 1650 until the present day. 1700 1750 1650 1800 1850 1900 1950 2000 year world population / billions Which phases of a sigmoid curve of population growth are not shown on this graph?

In which trophic level are herbivores found?

The graph shows the relative amounts of bacteria and dissolved oxygen at different locations along a river. Fertiliser has entered the river. At which distance along the river did the fertiliser enter the river? dissolved oxygen bacteria relative amount

Human insulin can be produced in large quantities by genetically modified bacteria. Four of the steps in the processes of genetic modification and insulin production are listed. Insulin is removed from the bacterial culture. An enzyme is used to cut out the insulin gene from a human chromosome. The insulin gene is placed into the plasmid of a bacterium. Bacteria with the insulin gene reproduce very rapidly. What is the order of these steps?