Biology 0610/22 February/March 2022: question paper and mark scheme

Question

The diagrams show a test-tube containing pond water. The green colour is caused by microorganisms that have chloroplasts. oxygen bubble pale green dark green pond water area light off light on Which characteristics of living organisms are shown? A excretion, growth and movement B movement, nutrition and sensitivity C nutrition, reproduction and respiration D reproduction, sensitivity and growth

Question

The key shows some features of living organisms that can be used to place them into one of three different kingdoms. living organism nucleus present no nucleus kingdom Z no cell wall cell wall present cell wall made of cellulose yes no kingdom X kingdom Y Which row correctly identifies these three kingdoms? X Y Z A fungi plant prokaryote B fungi plant protoctist C plant fungi prokaryote D plant fungi protoctist

Question

The diagram shows a mitochondrion. The scale bar shows the actual size of the mitochondrion. 1 μm The diagram is 70 mm long. What is the magnification of the diagram? A ×0.0007 B ×70 C ×7000 D ×70 000

Question

Two types of cell, one animal and one plant, were examined using a light microscope. Which row shows the correct combination of structures that would be observed in the cells? cell structure observed animal cell plant cell A chloroplast membrane vacuole cytoplasm B cytoplasm nucleus chloroplast membrane C membrane cell wall cytoplasm nucleus D nucleus chloroplast cell wall membrane

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The diagram shows a cross-section through a leaf. Which arrow shows the direction of diffusion of carbon dioxide on a sunny day? A B D C

Question

The diagram shows a plant cell after it has been submerged in a solution, P, for 20 minutes. Which row describes the water potential of solution P at the start of the experiment and the condition of the cell after 20 minutes? water potential of solution P condition of the cell at the start of the experiment after 20 minutes A higher than the inside of the cell plasmolysed and turgid B higher than the inside of the cell under high turgor pressure C lower than the inside of the cell plasmolysed and flaccid D the same as the inside of the cell under low turgor pressure

Question

Which row is correct for a positive food test for vitamin C? colour of the final colour of the food test reagent heat required food test reagent at the start A colourless yes purple B blue no colourless C colourless no blue D blue yes orange

Question

In which molecule are cross-links formed between bases? A carbohydrate B DNA C fat D glycogen

Question

What controls the speed of chemical reactions in all living cells? A enzymes B hormones C ions D vitamins

Question

Enzymes have an optimum temperature at which they are most active. Which row explains why enzyme activity decreases if the temperature is not optimum? below optimum temperature above optimum temperature A enzymes denature enzymes denature B enzymes denature enzymes have less kinetic energy C enzymes have less kinetic energy enzymes denature D enzymes have less kinetic energy enzymes have less kinetic energy

Question

A piece of foil was placed over one green and white leaf on a plant. white green foil The plant was placed under a bright light for 24 hours and then tested for starch with iodine solution. Which diagram shows the areas of the leaf that would stain blue-black with iodine solution? A B C D

Question

The graph shows the effect of light intensity on the rate of photosynthesis. rate of photosynthesis X light intensity Which environmental factor is limiting the rate of photosynthesis at X on the graph? A carbon dioxide concentration B light intensity C oxygen concentration D temperature

Question

Which condition can be caused by a lack of fibre in the diet? A constipation B obesity C scurvy D starvation

Question

In which test-tube will the breakdown of fat be fastest? A B C D milk, lipase milk and lipase milk and milk, boiled lipase and bile bile and bile

Question

The diagrams show stages in the passage of water through a plant. Which arrow shows water moving in the form of water vapour? A B C D

Question

The diagram shows some potato tubers. New shoots are beginning to grow. Sucrose is being translocated from source to sink. shoot tuber soil Which statement is correct? A The tuber is a sink. B The soil is a sink. C The shoots are sources. D The shoots are sinks.

Question

The diagram shows a section through the heart. P R Q What is the function of the structure labelled Q? A It controls the amount of blood leaving the heart. B It increases the pressure in part R. C It prevents backflow of blood into part P. D It prevents blood flowing into the vena cava.

Question

During the process of blood clotting, damage to blood vessels stimulates L, and M is converted to N. What are L, M and N? L M N A fibrin platelets fibrinogen B fibrinogen platelets fibrin C platelets fibrin fibrinogen D platelets fibrinogen fibrin

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Which statement about passive immunity is correct? A Antibodies are acquired. B It gives a long-term effect. C It is inherited. D Memory cells are produced.

Question

Compared with inspired air, which description of expired air is correct? A It has less oxygen and less carbon dioxide. B It has less oxygen and more carbon dioxide. C It has more oxygen and less carbon dioxide. D It has more oxygen and more carbon dioxide.

Question

Which row shows the features of the gas exchange surface in humans? surface area thickness A large thick B large thin C small thick D small thin

Question

Yeast is placed inside a container full of a glucose solution with no air. Which word equation summarises the process that takes place inside the container? A glucose → alcohol + carbon dioxide B glucose → lactic acid C glucose + oxygen → carbon dioxide + water D glucose + oxygen → alcohol

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Which process uses energy released in respiration? A diffusion B evaporation C growth D osmosis

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Which term describes the removal of the nitrogen-containing part of amino acids to form urea? A assimilation B deamination C denaturation D digestion

Question

Which numbered parts form the central nervous system? 1 2 3 A 1 only B 1 and 2 C 2 and 3 D 3 only

Question

The diagram shows a section through the eye of an octopus. Octopuses have eyes that are similar in structure and function to human eyes. 1 7 2 6 5 4 3 Which row identifies the structures of the octopus eye? pupil cornea lens iris A 4 6 7 3 B 5 1 2 3 C 4 1 7 5 D 5 6 2 4

Question

A person eats a large bowl of rice. Rice contains starch. What happens to the amounts of insulin and glucagon in their body? insulin glucagon A decreases decreases B decreases increases C increases decreases D increases increases

Question

A study investigated the effect on arm muscle surface area of taking testosterone and doing exercise. The participants in the study were given either testosterone or a placebo. The placebo does not contain any testosterone. The bar chart shows the results of the study. 600 average change 400 in arm muscle surface area / mm2 200 0 placebo testosterone placebo testosterone no exercise exercise Which conclusion about the data in the graph is correct? A Exercise has no effect on arm muscle surface area. B No exercise and not taking testosterone has the greatest effect on arm muscle surface area. C Exercise has the same effect on arm muscle surface area as no exercise. D Taking testosterone increases arm muscle surface area.

Question

Which statement about reproduction is correct? A All living species can reproduce asexually. B Gametes are needed for asexual reproduction. C Only organisms that are separated from other organisms of the same species can reproduce asexually. D Some organisms reproduce asexually and sexually.

Question

What will happen if a woman smokes during pregnancy? A Nicotine can cross the placenta and affect the fetus. B Nicotine can cause COPD in the lungs of the fetus. C The woman can become addicted to carbon monoxide. D Carbon monoxide can cause cancer in the lungs of the fetus.

Question

The graph shows the four hormones that control the menstrual cycle. Which curve on the graph represents the hormone LH? C D B concentration of hormone A 0 1 2 3 4 time / weeks

Question

What happens to the mass of DNA in a nucleus before mitosis occurs? A It doubles. B It halves. C It stays the same. D It halves and then halves again.

Question

In a species of pea plant, height is controlled by one gene. The allele for tall is dominant to the allele for short. A test cross is done to identify the genotype of a tall pea plant. The table shows the possible phenotypes of the offspring and a description of the genotypes of the tall parent pea plant. description of the phenotypes genotype of the tall of the offspring parent pea plant 1 all tall heterozygous 2 all tall homozygous dominant 3 all short homozygous dominant 4 tall and short heterozygous If a large number of offspring are produced, which rows are possible? A 1 and 3 B 1 only C 2 and 4 D 2 only

Question

Which statement about variation is correct? A Continuous variation results in few phenotypes with no intermediates. B Discontinuous variation results in few phenotypes with no intermediates. C Phenotypic variation is caused by environmental factors only. D Phenotypic variation is caused by genetic factors only.

Question

Some plants have small leaves with thick waxy cuticles. Which row describes the effect of these features on water loss and the type of plant that has these features? effect on type of plant water loss A decreases hydrophyte B decreases xerophyte C increases hydrophyte D increases xerophyte

Question

Some plants of different species can be crossed with each other to form hybrids that have a diploid number different from either of the two parent species. The diagram shows a cross between plants with different diploid numbers. species 1 species 2 diploid number 70 diploid number X hybrid zygote diploid number 64 What is the diploid number of species 2? A 29 B 32 C 35 D 58

Question

The diagram shows some of the stages involved in the nitrogen cycle. atmospheric nitrogen 5 1 nitrate 2 4 3 ammonium compounds plant protein Which processes are carried out at each stage? nitrogen absorption decomposition denitrification nitrification fixation A 2 4 5 1 3 B 2 3 1 4 5 C 1 5 2 3 4 D 1 2 3 5 4

Question

Genetically engineered bacteria are used to produce human proteins. Into which component of the bacterial cell is human DNA inserted to produce human proteins? A cell wall B nucleus C plasmid D rough endoplasmic reticulum

Question

The sugar in milk is digested by an enzyme. Which row matches the name of the enzyme with the sugar it digests? enzyme sugar in milk A lactase glucose B lactose lactase C lactase lactose D lactose sucrose

Question

The list shows activities that happen in a forest. 1 cutting down only selected trees 2 educating people about forests 3 replanting trees 4 cutting down trees to grow crop plants Which activities are likely to ensure the forest is used sustainably? A 1, 2 and 3 B 1, 2 and 4 C 1, 3 and 4 D 2 and 3 only