Reproduction (DP IB Biology: SL)

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

Which line represents the hormone responsible for ovulation?

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:

The diagram shows the female reproductive system.

Which row correctly identifies the structures?

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

Which row correctly identifies the steps?

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?

Which of the following statements about pollen transfer are correct?

I. Self pollination occurs when pollen is transferred between separate flowers on the same plant.

II. Pollen transfer can be carried out by small mammals.

III. Pollen can be transferred when birds consume fleshy fruits and then carry out egestion in another location.

Which statement correctly describes the part labelled X in the image below?

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

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

The image shows an animal pollinated flower

Identify the correct labels required for the image above.

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.

Which of the following statements explains the results?

I. Higher temperatures slows down or stops germination

II. Enzymes are denatured when seeds are grown at higher temperatures

III. Seeds that were soaked at 20 °C germinated more successfully than seeds soaked at 25 °C

IV. Soaking seeds at 35 °C had a less negative impact on germination compared to germinating at 35 °C

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?

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

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.

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

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.

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