1. Materia: Biology Senior 4
Profesora: Ma. Magdalena Ravagnan
Contenido nodal: The continuity of life and flowering plants
SEGUNDO TRIMESTRE
Fecha de presentación: February 2014
1) The figure below shows family tree for a condition known as nail-patella syndrome (NPS).
a i State whether NPS is controlled by a dominant or a recessive allele.
ii Explain which evidence from the family tree confirms your answer to i.
b Explain what the chances are for a third child of parents 6 and 7 having NPS. You may use a genetic diagram to help
your explanation.
2) (a) Select the correct term from the list below and write it in the box next to its description.
2. 3) A large number of seeds were germinated on damp sand. Random samples of 10 seedlings were taken every two days.
The fresh mass and the dry mass of each sample were measured and are shown in the graph, Fig. 2.1.
3. (a) (i) State why the fresh mass and dry mass of a seedling are different.
(ii) Fresh mass is not reliable as a measure of plant growth.
Suggest why dry mass is a more reliable measure of plant growth.
(iii) Explain why 10 seedlings, rather than 1, were used for each sample.
(b) (i) Describe what happens to the fresh mass of the seedlings in the first 2 days after the seeds were set to germinate.
(ii) Suggest a reason for this change in mass.
(c) (i) Describe what happens to the dry mass of the seedlings during the first 8 days.
(ii) Suggest a reason for this change in mass.
(d) Suggest which processes begin in the living seed during the early stages of germination.
4) (a) DRAW a section of a leaf LABEL ALL.
(i) State the function of the chloroplasts in photosynthesis.
(ii) Suggest the function of the stomata and the spaces between the spongy mesophyll cells in the process of
photosynthesis.
(b) Water is used in photosynthesis in the leaves of the plant. Write the word equation for photosynthesis.
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5) Describe three differences between insect and wind-pollinated flowers.
