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

• 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...
• 17M.1.SL.TZ1.1: Which structure found in eukaryotes has a single membrane? A. Nucleus B. Lysosome C....
• 17M.1.HL.TZ1.33: Which flower structures are indicated by the letters Y and Z?  
• 17M.1.HL.TZ2.30: Which process is matched with a valid example?
• 20N.1.HL.TZ0.34: Plants were given four different light treatments to investigate the influence of light on...
• 17N.2.HL.TZ0.08a:

  Plants have widespread influences, from food chains to climate change.

  Draw a labelled diagram of the internal structure of a seed.

• 17N.1.HL.TZ0.32: Agar is a growth medium without nutrients; starch agar is agar with starch added to it. Seed...
• 21M.1.HL.TZ1.34: Which method can be used to induce short-day plants to flower out of season? A. Grow them in...
• 21M.2.HL.TZ2.3b: An experiment was done to test the hypothesis that temperature affects the rate of germination of...
• 21N.1.HL.TZ1.34:

  The graph shows how the mass of a bean seed from which all water has been removed (dry mass) changes during germination.

  

   

  What can be deduced from the graph?

  A. The plant loses more water during period X than during period Y.

  B. During period Y, photosynthesis occurs but not respiration.

  C. During period Y, more CO₂ is fixed in photosynthesis than is released by cell respiration.

  D. The seeds were not exposed to the correct temperature for germination during period X.

• 21N.2.HL.TZ0.5b:

  Explain how some plant species are able to respond to changes in their abiotic environment and flower at a precise time of the year.

• 22M.1.HL.TZ2.34: Students investigated the environmental factors needed for germination, using seeds from 20...
• 18N.1.HL.TZ0.34: The diagram shows results of experiments into flowering in a species of plant. What can be...
• 18N.1.HL.TZ0.33: What is a difference between pollination and fertilization in flowering plants? A.  Pollination...
• 18N.2.HL.TZ0.4d.i: Suggest one advantage for the evergreen trees of the boreal forest being pollinated by wind.
• 18N.2.HL.TZ0.4d.ii: Discuss the advantages of the production of seeds enclosed in fruit.
• 18M.1.HL.TZ1.34: Fruit-eating bats living in protected Brazilian rainforests are attracted out of the forests to...
• 18M.2.HL.TZ2.1d.i: For each of the stages, identify whether the starch concentration at the end of the day is higher...
• 18M.2.HL.TZ2.1b: Distinguish between plants grown in long days and short days in the mean number of leaves per...
• 18M.2.HL.TZ2.1f: Using all relevant data in this question, deduce with reasons whether Arabidopsis is a long day...
• 18M.2.HL.TZ2.1a.ii: Distinguish between plants grown in long days and short days in the timing of the four stages of...
• 18M.2.HL.TZ2.1d.ii:

  Suggest reasons for the difference in end of day starch concentrations in stage 2 (S2) for the plants grown in long days and short days.

• 18M.2.HL.TZ2.1a.i:

  Calculate the difference (in mm²) in the mean leaf area of L6 at the start of stage 4 between the leaves of plants grown in long days and short days.

• 18M.2.HL.TZ2.1c: Discuss the evidence provided in the bar chart for the hypothesis that plant leaves use up starch...
• 18M.2.HL.TZ2.1e: Using the data in the bar chart, discuss the evidence for Arabidopsis plants adapting to...
• 19M.1.HL.TZ1.34: Which statement describes the control of reproduction in flowering plants? A. Flowering in...
• 19M.1.HL.TZ1.32:

  The image shows a cross-section of a flower.

  

  [Source: © International Baccalaureate Organization 2019]

   

  Where does production of haploid gametes occur?

  A. I and II only

  B. III and IV only

  C. I and III only

  D. II and IV only

• 19M.2.HL.TZ2.4c: Successful sexual reproduction in flowering plants depends on several essential processes....
• 19M.3.HL.TZ2.1a: Using the drawing, deduce which plant phylum T. grandiflora belongs to, giving one visible...
• 19M.3.HL.TZ2.1b.ii: Outline the relationship the bee has with the T. grandiflora flower.
• 19M.3.HL.TZ2.1c: After fertilization, seeds of T. grandiflora form in a small pod. If you were provided with Petri...
• 19M.3.HL.TZ2.1b.i: Identify the structure labelled X.
• 19N.1.HL.TZ0.34: A pollen tube grows down the style to an egg inside the ovary of a flower. What is the next...
• 19N.2.HL.TZ0.8a:

  Draw a half-view of an animal-pollinated flower.