DP Biology Questionbank

Description

Nature of science:
Paradigm shift—more than 85% of the world’s 250,000 species of flowering plant depend on pollinators for reproduction. This knowledge has led to protecting entire ecosystems rather than individual species. (2.3)Understandings:

• Flowering involves a change in gene expression in the shoot apex.
• The switch to flowering is a response to the length of light and dark periods in many plants.
• Success in plant reproduction depends on pollination, fertilization and seed dispersal.
• Most flowering plants use mutualistic relationships with pollinators in sexual reproduction.

Applications and skills:

• Application: Methods used to induce short-day plants to flower out of season.
• Skill: Drawing internal structure of seeds.
• Skill: Drawing of half-views of animal-pollinated flowers.
• Skill: Design of experiments to test hypotheses about factors affecting germination.

Guidance:

• Students should understand the differences between pollination, fertilization and seed dispersal but are not required to know the details of each process.
• Flowering in so-called short-day plants such as chrysanthemums, is stimulated by long nights rather than short days.

Utilization:

• The University of Göttingen, in Germany, conducted an extensive review of scientific studies from 200 countries for 115 of the leading global crops in 2005. They found that 87 of the crop plants depend to some degree upon animal pollination, including bees. This accounts for one-third of crop production globally.

Directly related questions

• 17N.1.HL.TZ0.32: Agar is a growth medium without nutrients; starch agar is agar with starch added to it. Seed...
• 17N.2.HL.TZ0.08a: Plants have widespread influences, from food chains to climate change. Draw a labelled diagram...
• 17M.1.HL.TZ2.30: Which process is matched with a valid example?
• 17M.1.HL.TZ1.33: Which flower structures are indicated by the letters Y and Z?  
• 17M.1.SL.TZ1.1: Which structure found in eukaryotes has a single membrane? A. Nucleus B. Lysosome C....
• 16M.3.HL.TZ0.3c: Outline one variable that would need to be controlled in this experiment.
• 16M.3.HL.TZ0.3b: Suggest one reason for the difference in the rooting success in the juvenile shoots and the...
• 16M.3.HL.TZ0.3a: Distinguish between the rooting success of the juvenile shoots and the mature shoots.
• 16N.2.HL.TZ0.7b: The flowers of angiospermophyta are used for sexual reproduction. Outline three processes...
• 16N.1.HL.TZ0.33: Chrysanthemums are an important commercial flower. As a short-day plant, how can growers induce...
• 16M.1.HL.TZ0.29: How do most angiospermophyta improve sexual reproductive success? A....
• 15M.2.HL.TZ2.8b: Outline the conditions needed for the germination of a typical seed.
• 15N.1.HL.TZ0.31: When a plant stem bends towards sunlight, what change does auxin promote in the cells on the side...
• 13M.2.HL.TZ2.6a: Outline how and where energy is stored in plants. 
• 13M.2.HL.TZ1.5b: Outline the metabolic processes that occur in starchy seeds during germination.
• 13M.1.HL.TZ2.33: Which process happens first during germination of a starchy seed? A. Formation of gibberellinB....
• 13N.1.HL.TZ0.32: The following is a diagram of a flower.  What structures are indicated by the letters X, Y and...
• 13N.1.HL.TZ0.33: What steps occur in germination after water uptake?A. Gibberellin is produced, followed by...
• 12M.2.HL.TZ2.7a: Outline pollination, fertilization and seed dispersal.
• 09M.2.HL.TZ1.4c: Explain how flowering is controlled in long-day and short-day plants.
• 10N.2.HL.TZ0.1e(iii): State, giving one reason taken from the data opposite, if unmodified rice is a short-day plant or...
• 10N.2.HL.TZ0.1e(i): State the overall effect of overexpression of the OsGI gene in plants treated with short-day light.
• 10N.2.HL.TZ0.2b(ii): Comment on the hypothesis that the plant shown in the photograph could be pollinated by an animal.
• 10N.2.HL.TZ0.1g: Evaluate, using all the data, how modified varieties of rice could be used to overcome food...
• 10N.2.HL.TZ0.2a: The photograph below shows the flowers of Campanula persicifolia. Label structures I, II and III.
• 10N.2.HL.TZ0.1e(ii): Compare the results between the plants treated with short-day light and the plants treated with...