14.2. Mammalian sense organs
A subsection of Biology, 5090, through 14. Coordination and control
Listing 10 of 84 questions
shows changes in the curved shape of the lens of a person’s eye over time. least curved shape of lens most curved time H During the period of time shown in , the person carried out each of the following actions: P read the words in a book Q read the time on a wall clock R looked out of a window at a bird high in the sky. Identify in what order the person carried out actions P, Q and R. Place the letters P, Q and R in the correct order below. At the time labelled H on , the shape of the lens is changing. Outline, with reference to named structures in the eye, how this change happens. shows a front view of the eye in dim light. Complete the labels on by naming the two parts of the eye indicated by the label lines. Complete to show a view of the same eye as it would appear in bright light. State the type of nervous response that takes place when the eye changes its appearance from that in to that in . Suggest the importance to the person of this response taking place in the eye.
5090_w24_qp_22
THEORY
2024
Paper 2, Variant 2
View
The diagram shows the structure of a type of bacterium and details of the response of the bacterium to light. A B direction of light direction of light receptors fibres that attach to a surface and then contract to enable the bacterium to move structures containing a chemical similar to chlorophyll movement Use information in the diagram to suggest: the sequence of events that takes place when the bacterium is provided with light from the direction shown the advantage to the bacterium of responding to light in this way. There are similarities between the functions of parts of the bacterium and the functions of structures found in the human eye. Suggest which structure in the human eye has a function similar to each of the following regions of the bacterium. A B The type of bacterium shown in the diagram fixes nitrogen. Describe the role of bacteria in nitrogen fixation. The enzyme that these bacteria use to fix nitrogen is destroyed in the presence of oxygen. Suggest why destruction of this enzyme is likely to occur in the type of bacterium in the diagram. Suggest one adaptation that such bacteria may have developed to prevent the destruction of this enzyme.
5090_s19_qp_22
THEORY
2019
Paper 2, Variant 2
View
Questions Discovered
84