CIE iGCSE Co-Ordinated Science B15.3 Sexual reproduction in plants Exam Style Questions Paper 1
Question
In which structure is pollen made?
A. anther
B. ovary
C. sepal
D. stigma
▶️Answer/Explanation
Answer: A. anther
Explanation: Pollen is produced in the anther, which is part of the stamen in a flower. The ovary, sepal, and stigma are other parts of the flower but are not involved in pollen production.
Question
The diagram shows a section of a pea flower.
Which part is the ovary?
A. A
B. B
C. C
D. D
▶️Answer/Explanation
Answer: C. C
Explanation: The ovary is the part of the flower that contains the ovules, which develop into seeds after fertilization.
Question
The diagram shows a cross-section of a carpel of an insect-pollinated flower.
Which row correctly shows the processes that have taken place?
▶️Answer/Explanation
Ans: B
Question
The diagram shows a section through a flower.
Which labelled structures are the anther and the ovary?
▶️Answer/Explanation
Ans : D
Question
Which diagram shows fertilisation occurring in a flower?
▶️Answer/Explanation
Ans: B
Question
Before fertilisation in flowering plants, which structure must the pollen nucleus pass through to reach the nucleus in the ovule?
(A) filament
(B) petal
(C) stamen
(D) style
▶️Answer/Explanation
Ans: D
Question
Which features are adaptations of wind-pollinated flowers?
1. anthers exposed to the wind
2. produce heavy sticky pollen
3. produce large quantities of pollen
4. brightly coloured petals
5. produce nectar
A. 1, 2 and 3
B. 3, 4 and 5
C. 1 and 3 only
D. 4 and 5 only
▶️Answer/Explanation
Answer: C
Explanation: Wind-pollinated flowers have adaptations such as exposed anthers to release pollen into the wind and produce large quantities of pollen to increase the chances of pollination. They do not produce heavy sticky pollen, brightly coloured petals, or nectar, as these are adaptations for insect-pollinated flowers.
Question
What describes pollination?
A) fertilisation of an egg by a pollen grain
B) pollen being carried by bees
C) transfer of pollen from a stigma to a stamen
D) transfer of pollen from an anther to a stigma
▶️Answer/Explanation
Answer: D) transfer of pollen from an anther to a stigma
Explanation: Pollination is the transfer of pollen from the anther (male part) to the stigma (female part) of a flower. This can occur through various agents like wind, water, or animals (e.g., bees).
Question
The diagram shows a section through a pea flower. Where does fertilisation occur?
▶️Answer/Explanation
Answer: C. C
Explanation: Fertilisation in plants occurs in the ovule, which is located within the ovary of the flower. The ovule is labeled as C in the diagram.
Question
The diagram shows a section through an insect-pollinated flower.
When pollination occurs, where must the pollen grains reach?
▶️Answer/Explanation
Answer: B
Explanation: In pollination, pollen grains must reach the stigma (part B) of the flower, where they can germinate and grow a pollen tube to fertilize the ovule.