IBBiologySLTopic QuestionsContinuity & ChangeReproduction

Syllabus Edition

First teaching 2023

First exams 2025

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Reproduction (SL IB Biology)

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1
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The diagram below shows the male reproductive system.QNw5zoZb_e-3

Which row correctly identifies the structures?

  I II III IV V
A. Urethra Sperm duct Testis Epididymis Seminal vesicle
B. Seminal vesicle Penis Scrotum Bladder Testis
C. Sperm duct Urethra Seminal vesicle Epididymis Testis
D. Sperm duct Urethra Testis Seminal vesicle Epididymis

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2
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During which phase of the menstrual cycle does menstruation occur (approximately)?

  • Days 1 - 7

  • Days 7 - 14

  • Days 14 - 21

  • Days 21 - 28

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3
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The peak in luteinising hormone (LH) during the menstrual cycle lead to which of the following events?

  • Stimulates the development of several immature egg cells in follicles in the ovary.

  • Stimulates the secretion of oestrogen by the follicle wall.

  • Stimulates the release of an egg into the oviduct.

  • Stimulates the endometrium to start thickening and the egg cell to mature.

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4
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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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5
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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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1
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Four hormones all interact to control the menstrual cycle via both negative and positive feedback.

Which of the below is an example of a negative feedback mechanism that occurs during the menstrual cycle?

  • Progesterone inhibiting oestrogen

  • Oestrogen inhibiting luteinizing hormone

  • Follicle stimulating hormone inhibiting oestrogen

  • Oestrogen inhibiting follicle stimulating hormone

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2
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Identify the set of images that correctly shows follicle development during the course of the menstrual cycle.

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3
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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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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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1
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The following graph shows the hormones involved in the menstrual cycle.

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Which line represents the hormone responsible for ovulation?

  • Line A.

  • Line B.

  • Line C.

  • Line D.

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2
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Polycystic ovary syndrome (PCOS) is a condition which may affect certain women during their childbearing years. Some of the most common symptoms of this condition is a failure to ovulate and irregular menstrual cycles. Women with PCOS have an increased risk of developing endometrial cancer.

What would be the most appropriate explanation for this?

The endometrium will:

  • Build up due to the lack of ovulation.

  • Be shed too often.

  • Build up due to the lack of menstruation.

  • Be shed during ovulation.

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3
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The diagram shows the female reproductive system.

 SvDIlN5u_2

 

Which row correctly identifies the structures?

  I II III IV  V
 A Oviduct Ovary Uterus Vagina Cervix
 B Ovary Oviduct Uterus Vagina Cervix
 C Oviduct Ovary Uterus Cervix Vagina
 D Oviduct Ovary Cervix Uterus Vagina

 

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4
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The following diagram shows the steps followed during in vitro fertilization.

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Which row correctly identifies the steps?

  I II III
 A  Ovulation  Fertilization  Egg washing
 B  Ovulation  HCG injection  Fertilization
 C  HCG injection    Ovulation  Fertilization
 D  HCG injection  Egg washing  Fertilization

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5
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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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6
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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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7
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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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8
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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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9
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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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10
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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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