Marine organisms and physiology — AS & A Level Marine Science (9693) questions by topic

Carbon, hydrogen and oxygen are used to make many important biological molecules. Complete Table 1.1 by stating one other essential element required to make each biological…

Blue crabs are crustaceans. Fig. 1.1 shows a blue crab — a photograph of a crab viewed from above, showing the broad, oval carapace (upper shell), two large claws (chelipeds),…

Some copepods are parasites of marine fish. Describe the meaning of the term parasitism.

Scientists monitor the population of green turtles, Chelonia mydas, nesting at Raine Island in the Great Barrier Reef. The scientists use a method called mark-recapture (MRC) to…

Fig. 2.1 shows a great white shark, Carcharodon carcharias — a photograph of a large, streamlined shark with a white underside and grey upper body, swimming in open water. On Fig.…

Fig. 4.1 shows a barrel jellyfish — a photograph of a large, dome-shaped jellyfish with a white/translucent bell and multiple thick oral arms hanging below it, photographed…

Scientists monitor the population of green turtles, Chelonia mydas, nesting at Raine Island in the Great Barrier Reef. The scientists use a method called mark-recapture (MRC) to…

Fig. 2.1 shows a great white shark, Carcharodon carcharias — a photograph of a large, streamlined shark with a white underside and grey upper body, swimming in open water. On Fig.…

Fig. 4.1 shows a barrel jellyfish — a photograph of a large, dome-shaped jellyfish with a white/translucent bell and multiple thick oral arms hanging below it, photographed…

Describe the different ways that carbon compounds can enter the ocean.

Mitochondria are organelles found in eukaryotic cells. Describe the structure AND function of a mitochondrion.

Mitochondria are organelles found in eukaryotic cells. Describe the structure AND function of a mitochondrion.

Endoriftia bacteria fix carbon by chemosynthesis. Endoriftia bacteria live inside giant tubeworms, Riftia. Describe the relationship between Riftia and Endoriftia.

Oysters are shelled molluscs that have a complex life cycle. The adults are sessile organisms that anchor to a substrate. Fig. 3.1 shows some adult oysters — a photograph of…

Sea trout use pumped ventilation to move water over their gills. Some fish, such as tuna, use ram ventilation. Outline how pumped ventilation differs from ram ventilation.

Sea trout use pumped ventilation to move water over their gills. Some fish, such as tuna, use ram ventilation. Outline how pumped ventilation differs from ram ventilation.

Coral polyps have two methods of obtaining nutrition. Describe and explain both methods.

Fig. 1.1 is an electron micrograph of Dunaliella, a unicellular green alga. State one function of the cell nucleus.

The gills of most fish have cells on their surfaces that secrete a thick, slippery fluid called mucus. The cells that secrete mucus are known as goblet cells. Fig. 1.1 is a…

Killifish are euryhaline fish that are able to osmoregulate. State what is meant by the term euryhaline.

The gills of most fish have cells on their surfaces that secrete a thick, slippery fluid called mucus. The cells that secrete mucus are known as goblet cells. Fig. 1.1 is a…

Killifish are euryhaline fish that are able to osmoregulate. State what is meant by the term euryhaline.

Fig. 5.1 shows a brittle star which belongs to the echinoderm phylum. Make a large drawing of the brittle star shown in Fig. 5.1. Do not include the markings on the arms.

A survey was carried out to estimate the total population of the shark Carcharias taurus in the coastal waters off south-east Australia. Scientists attached numbered tags to a…

Fig. 5.1 shows a brittle star which belongs to the echinoderm phylum. Make a large drawing of the brittle star shown in Fig. 5.1. Do not include the markings on the arms.

A survey was carried out to estimate the total population of the shark Carcharias taurus in the coastal waters off south-east Australia. Scientists attached numbered tags to a…

Fig. 5.1 shows a brittle star which belongs to the echinoderm phylum. Make a large drawing of the brittle star shown in Fig. 5.1. Do not include the markings on the arms.

A survey was carried out to estimate the total population of the shark Carcharias taurus in the coastal waters off south-east Australia. Scientists attached numbered tags to a…

Marine organisms are affected by the salinity of sea water. Explain why tuna need to constantly drink sea water.

Marine organisms are affected by the salinity of sea water. Explain why tuna need to constantly drink sea water.

Marine organisms are affected by the salinity of sea water. Explain why tuna need to constantly drink sea water.

Greenland sharks can live for over 200 years and are found in the almost freezing waters of the North Atlantic and Arctic oceans. Most sharks, such as the blue shark, live in…

Compare gaseous exchange in coral polyps and in tuna.

Describe how ions such as sodium pass through the cell membrane.

The life cycle of jellyfish has two different forms – a free-swimming medusa and a sessile polyp. This is similar to the life cycle of coral polyps. Name the phylum to which…

Table 4.1 shows the rates of photosynthesis of a green macroalga in different colours of light: colour of light rate of photosynthesis / arbitrary units --- --- white 31 red 21…

Fig. 1.1 shows a jellyfish. State the phylum to which jellyfish belong.

Table 4.1 shows the rates of photosynthesis of a green macroalga in different colours of light: colour of light rate of photosynthesis / arbitrary units --- --- white 31 red 21…

Fig. 1.1 shows a diagram of a cell from the leaf of a species of seagrass. Structures A, B and C are labelled. Give the names of the structures labelled A and B.

Fig. 2.1 shows an electron micrograph of a chloroplast. On Fig. 2.1, label the part of the chloroplast where the light-independent stage occurs with the letter X and a label line.

Fig. 1.1 is a diagram of part of a cell membrane. Identify the molecules labelled A and B in Fig. 1.1.

Killifish are a euryhaline species of fish. State what is meant by the term euryhaline.

Copepods are marine zooplankton. They are crustaceans that have a complex life cycle. Explain the advantages of having a complex life cycle.

Fig. 1.1 shows a diagram of a section of a cell surface membrane. Name the structures labelled A and B.

Killifish are a euryhaline species of fish. State what is meant by the term euryhaline.

Copepods are marine zooplankton. They are crustaceans that have a complex life cycle. Explain the advantages of having a complex life cycle.

Lybia tessellata is a boxer crab that uses sea anemones as weapons. The table in Fig. 1.1 shows the classification hierarchy of the boxer crab. The domain and two other groups…

Fig. 3.1 shows a diagram of a kelp macroalga. Identify the structures labelled J, K, L and M in Fig. 3.1.

Fig. 1.1 shows a boxer crab, Lybia tessellata, and two anemones. Complete Table 1.1 to show the hierarchy of classification of the boxer crab.

Fig. 3.1 is a diagram of a kelp. Kelp is a macroalga. On Fig. 3.1 identify the parts labelled J, K, L and M.

Fig. 1.1 shows a boxer crab, Lybia tessellata, and two anemones. Complete Table 1.1 to show the hierarchy of classification of the boxer crab.

Fig. 3.1 is a diagram of a kelp. Kelp is a macroalga. On Fig. 3.1 identify the parts labelled J, K, L and M.

Tuna are osmoconformers that live in the sea. Explain how tuna regulate their internal water and ion concentration.

Explain why and how osmoregulation occurs in tuna.

Explain why and how osmoregulation occurs in tuna.

Organisms require oxygen for aerobic respiration. Complete the balanced chemical symbol equation for aerobic respiration. 6O₂ + ......... → ......... + .........

Organisms require oxygen for aerobic respiration. Complete the balanced chemical symbol equation for aerobic respiration. 6O₂ + ......... → ......... + .........

Organisms require oxygen for aerobic respiration. Complete the balanced chemical symbol equation for aerobic respiration. 6O₂ + ......... → ......... + .........