DP IB Biology: HL

Topic Questions

IBBiology: HLDPTopic Questions9. Plant Biology (HL Only)9.4 Reproduction in Plants

Syllabus Edition

First teaching 2014

Last exams 2024

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9.4 Reproduction in Plants

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1
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Which of the following is not involved with the vegetative phase of a flowering plant?

  • The plant stem elongates

  • The anthers start producing pollen

  • The leaves mature and the rate of photosynthesis is rapid

  • The plant is able to produce clones of itself

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2
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A florist wants to induce flowering in short day pot plants during the summer months.

Which of the following would deliver the required results?

  • Place the plants in the shade during the day

  • Keep the plants on a sunny windowsill during the day

  • Switch the lights off at night so that the plants are in darkness

  • Place the plants in a completely dark room during part of the day

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3
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Which of the following best describes the mutualistic relationship between flowers and pollinators?

  1. Flowers will benefit from the relationship by producing pollen for pollinators
  2. Pollen is transferred to the next flower that the pollinator visits
  3. Pollinators will benefit from the relationship by pollinating flowers
  4. Sexual reproduction in flowering plants can occur due to pollinators
  5. Nectar serves as a source of food for pollinators

  • I., II. and IV.

  • II., IV. and V.

  • I., III., IV. and V.

  • II., III., IV. and V.

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4
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Which of the following correctly identifies the function of each flower part?

  Anther Ovary Sepal Stigma
A. Pollen is found here Receives pollen from another flower Protects the flower bud during development Contains the female gametes
B. Pollen is found here Contains the female gametes Brightly coloured to attract pollinators Receives pollen from another flower
C. Pollen is found here Contains the female gametes Protects the flower bud during development Receives pollen from another flower
D. Contains the female gametes Receives pollen from another flower Brightly coloured to attract pollinators Pollen is found here

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5
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Which of the following represents the traditional approach to conserving pollinators?

  • Protecting individual pollinator species

  • Conserving the species that the pollinators rely on for survival

  • Protecting the habitat that the pollinators are found in

  • Preserving the ecological processes within the pollinator ecosystems

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1
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The graph below shows plant flowering at different day lengths in a species of plant.9-4_q1h

Which of the following provides the most accurate explanation of the data?

  • This is a short day plant and high levels of PFR that are generated when days are long activate flowering.

  • This is a long day plant and high levels of PR that are generated when days are long activate flowering.

  • This is a long day plant and high levels of PFR that are generated when days are long activate flowering.

  • This is a long day plant and low levels of PFR that are generated when days are short activate flowering.

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2
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Scientists investigated the effect of temperature on the activity of pollinators. Feeders containing a sucrose solution representing nectar were kept at different temperatures. These feeders were exposed to pollinators and the number of visits each feeder received was recorded.

The results are shown in the graph below.9-4_q2h

Which of the following is a correct statement based on the results above?

  • Pollinator visits per 15 mins increase as temperatures increase up to 25 °C and then visits decrease again.

  • Global warming will cause a decrease in pollinator activity.

  • At temperatures between 0 and 25 °C, there are always more pollinator visits at higher temperatures.

  • Increased temperatures cause an increase in pollinator visits between 0 and 25 °C.

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3
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The following steps describe the role of gibberellin in seed germination.

  1. Maltose is converted into sucrose and glucose for transport in the germinating seed.
  2. Several genes are expressed that code for a series of enzymes.
  3. Gibberellin is produced, influencing growth and enzyme production in the embryo.
  4. These products are used to produce ATP and to build up the tissues of the growing plant.
  5. Amylase breaks down insoluble starch within the food stores of the germinating seed.

Which of the following represents the correct sequence of these steps?

  • III → II → V → I → IV

  • II → III → V → I → IV

  • II → V → I → IV→ III

  • V → I → IV → II → III

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4
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An investigation was carried out into the effect of pH on the germination of seeds of a species of plant. Scientists calculated the number of germinated seeds as a percentage of the total number of seeds planted at each soil pH value. To determine the germination rate the germination percentage for each pH value was divided by the number of days over which newly germinated seeds were observed during the investigation. Note that the error bars for germination rate show standard deviation.

The results of the investigation is shown in the graph below.9-4_q4h

Which of the following provides the most accurate conclusion for this investigation.

  • This plant species germinates more successfully in alkaline soil, with most seeds germinating at a pH value of 4.

  • This plant species germinates more successfully in acidic soil, with most seeds germinating at a pH of 5.

  • This plant species does not have a high rate of germination in alkaline soil, with a significant decrease in the percentage of seeds that germinated daily above a pH value of 7.

  • This plant species showed the highest germination success in acidic soils, with most seeds germinating at a pH of 4.

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5
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Which of the following statements relating to phytochrome in flowering plants are not correct?

  1. PFR is converted to PR when it absorbs red light of wavelength 660 nm.
  2. PFR will gradually convert back into PR in the absence of sunlight.
  3. During the day levels of PFR will increase and levels of PR will decrease due to the absorption of light with a wavelength of 730 nm.
  4. In short day plants the conversion of PFR to PR means that too few PFR receptors are occupied at the end of a long night to inhibit flowering.
  5. Phytochrome is a pigment found in leaves that can switch between the active form PR and the inactive form PFR.

  • I, IV, and V only.

  • II, IV, and V only.

  • I, III, and V only.

  • I, III, and IV only.

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11 mark

Which of the following is not involved with the control of flowering in plants?

  • The length of time for which it is dark in every 24 hour period.

  • The amount of red light absorbed by a plant’s cells

  • The expression of certain genes.

  • The concentration of both forms of phytochrome in a plant’s cells.

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21 mark

The graph below shows plant flowering at different day lengths in short day plants.

What is happening at the stage marked X?q2_9-4_reproduction_in_plants_ib_biology_hl_mcq

  • There are high levels of PFR and therefore flowering is activated.

  • Night length is shorter than the critical length.

  • There are low levels of PFR and therefore flowering is not inhibited.

  • There are high levels of PFR and therefore flowering is inhibited.

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31 mark

Which of the following will induce flowering in long day plants grown during the winter?

  • Providing brighter light during the day.

  • Providing equal day and night lengths.

  • Providing a longer dark period.

  • Providing periods of light during the night.

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41 mark

The graph below shows a possible future consequence of climate change on plant flowering dates and the dates on which pollinators are active.

What would the consequence of the data shown in the graph be for plants and pollinators, and why?q4_9-4_reproduction_in_plants_ib_biology_hl_mcq

 

Consequence

Reason
A

No change in plant and pollinator populations

The same number of plants would be pollinated and pollinators would still get enough food
B

Decline in both plant and pollinator populations

Fewer plants would be pollinated and less food would be available for pollinators
C

Decline in plant population but not in pollinator population

Fewer plants would be pollinated but pollinators would still get enough food
D

Decline in pollinator population but not in plant population

The same number of plants would be pollinated but less food would be available for pollinators

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51 mark

Which of the following statements about pollen transfer are correct?

  1. Self pollination occurs when pollen is transferred between separate flowers on the same plant.
  2. Pollen transfer can be carried out by small mammals.
  3. Pollen can be transferred when birds consume fleshy fruits and then carry out egestion in another location.

  • I only

  • I and II only

  • I and III only

  • I, II, and III

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61 mark

Which statement correctly describes the part labelled X in the image below?q6_9-4_reproduction_in_plants_ib_biology_hl_mcq

  • Diploid pollen tube

  • Haploid male nucleus

  • Diploid zygote

  • Haploid ovum

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71 mark

The graph below shows the percentage of successful germination of seedlings in relation to the dispersal distance from the parent tree.q7_9-4_reproduction_in_plants_ib_biology_hl_mcq

Which of the following explains the pattern shown in the data?

  • Seeds that were dispersed closest to the tree were eaten by squirrels

  • Seeds dispersed too far away from the parent tree were too exposed to germinate successfully

  • Fewer seeds were dispersed in the area closest to the tree

  • Seeds dispersed too close to the parent tree may not germinate due to competition

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81 mark

What is the name and function of the component labelled X on the seed diagram below?q8_9-4_reproduction_in_plants_ib_biology_hl_mcq

 

Name

Function
A

Cotyledon(s)

Contain the endosperm and provide a food source for the germinating seed
B

Plumule

Develops into the first shoot of the seedling
C

Radical

Develops into the first root of the seedling
D

Endosperm

Develops into the first leaves of the seedling

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91 mark

The image shows an animal pollinated flowerq9_9-4_reproduction_in_plants_ib_biology_hl_mcq

Identify the correct labels required for the image above.

 

I

II

III

IV

V
A

Stigma

Receptacle

Nectary

Filament

Anther
B

Style

Receptacle

Sepal

Anther

Filament
C

Ovary

Stamen

Sepal

Anther

Filament
D

Stigma

Sepal

Nectary

Filament

Anther

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101 mark

The table below shows the effect of temperature on the germination of seeds. The seeds were first soaked in a range of temperatures before being germinated at either
20 °C or 35 °C.

Temperature at which seeds were soaked in °C

 Percentage of seeds which germinated Percentage of seeds which germinated
  At 20 °C At 35 °C

20

100

91

25

100

45

30

43

3
35

24

0

Which of the following statements explains the results?

  1. Higher temperatures slows down or stops germination
  2. Enzymes are denatured when seeds are grown at higher temperatures
  3. Seeds that were soaked at 20 °C germinated more successfully than seeds soaked at 25 °C
  4. Soaking seeds at 35 °C had a less negative impact on germination compared to germinating at 35 °C

  • II and IV

  • I, II and IV

  • I, II, III and IV

  • I and II

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