Sexual reproduction in plants — Paper 2 · IGCSE Biology (9-1) 0970

29 Which two statements are correct for the process of cross-pollination in plants? 1 increases potential for variation in offspring 2 pollen is transferred to a different flower on the same plant 3 reduces potential to respond to environmental change 4 pollen is transferred to a flower on a different plant of the same species A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

1 marks

Answer: B

This question in 0970/21 May/June 2018

29 What is an advantage of self-pollination? A Evolution is not possible. B Genetic variation cannot occur. C Isolated individuals can reproduce. D It does not require gametes.

1 marks

Answer: C

This question in 0970/22 May/June 2019

28 Which description of cross-pollination is correct? A the transfer of pollen grains from the anther of one plant to the stigma on a different plant B the transfer of pollen grains from the anther to the stigma on the same plant C the transfer of pollen grains from the stigma of one plant to the anther on a different plant D the transfer of pollen grains from the stigma to the anther on the same plant

1 marks

Answer: A

This question in 0970/21 May/June 2020

29 The diagram shows half a flower. There is a description of each numbered part. 2 1 3 1 the stigma which receives pollen from insects 2 the anther which produces smooth and light pollen grains 3 the ovule where fertilisation occurs when the male and female nuclei fuse Which descriptions are correct for an insect-pollinated flower? A 1 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3

1 marks

Answer: B

This question in 0970/22 May/June 2020

27 Some flowers can only be pollinated by specific insect species. What will happen if none of these insects are present? A genetically different seed produced B genetically identical seed produced C no seed produced D only small amounts of seed produced

1 marks

Answer: C

This question in 0970/22 Oct/Nov 2020

28 Which sequence of structures does a pollen tube grow through in a flower? A ovary  ovule  stigma  style B ovary  stigma  ovule  style C stigma  style  ovary  ovule D stigma  ovary  style  ovule

1 marks

Answer: C

This question in 0970/21 May/June 2022

28 What is the sequence of events in sexual reproduction in plants? A growth of pollen tube → fertilisation → pollination B growth of pollen tube → pollination → fertilisation C pollination → fertilisation → growth of pollen tube D pollination → growth of pollen tube → fertilisation

1 marks

Answer: D

This question in 0970/22 Oct/Nov 2022

28 The diagram shows the structure of part of a flower. anther stigma The arrow represents the transfer of pollen. Which statement about the arrow is correct? A The arrow represents cross-pollination in an insect-pollinated flower. B The arrow represents cross-pollination in a wind-pollinated flower. C The arrow represents self-pollination in an insect-pollinated flower. D The arrow represents self-pollination in a wind-pollinated flower.

1 marks

Answer: C

This question in 0970/22 May/June 2023

30 Pollen grains from a plant were placed onto the stigma of a flower of the same plant. The lengths of the pollen tubes were measured for four hours. (The mean length of the style in this species of plant is 2 mm.) This was repeated using pollen from a different plant. The results are shown. 3500 pollen from a different plant 3000 2500 mean length 2000 of the pollen tubes / μm 1500 1000 500 pollen from the same plant 0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 time / hours Which statements are correct? 1 Self-pollination does not lead to fertilisation. 2 The difference in growth of the two types of pollen is an adaptation to increase variation. 3 The pollen tubes from a different plant grew fastest between 2.0 hours and 4.0 hours. A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

1 marks

Answer: B

This question in 0970/22 Oct/Nov 2023

30 The diagram shows the carpel of a flower just after pollination. X What is the name of the part labelled X? A filament B ovule C pollen tube D stigma

1 marks

Answer: C

This question in 0970/21 May/June 2024

30 A farmer grows hot pepper plants and sweet pepper plants in different fields on his farm. Each year, the farmer saves seeds from the pepper plants to grow the next crop of peppers. One year, the farmer notices that some of the seeds from the sweet pepper plants have grown into plants which produce hot and sweet peppers. What is the most likely explanation? A Self-pollination has occurred and pollen has been transferred from the anther of a hot pepper plant to the stigma of a sweet pepper plant. B Cross-pollination has occurred and pollen has been transferred from the stigma of a hot pepper plant to the anther of a sweet pepper plant. C Self-pollination has occurred and pollen has been transferred from the stigma of a hot pepper plant to the anther of a sweet pepper plant. D Cross-pollination has occurred and pollen has been transferred from the anther of a hot pepper plant to the stigma of a sweet pepper plant.

1 marks

Answer: D

This question in 0970/22 Oct/Nov 2024

29 Which description of cross-pollination is correct? A the transfer of pollen grains from the anther of one plant to the stigma on a different plant B the transfer of pollen grains from the anther to the stigma on the same plant C the transfer of pollen grains from the stigma of one plant to the anther on a different plant D the transfer of pollen grains from the stigma to the anther on the same plant

1 marks

Answer: A

This question in 0970/22 May/June 2025

24 The diagram shows parts of two different plants, 1 and 2, of the same species. The transfer of pollen between the flowers of these two plants is shown by the arrows labelled P and Q. P Q 1 2 Which arrows show cross-pollination, and which transfer of pollen would produce the most variation in the offspring? transfer of pollen that produces the cross-pollination most variation in the offspring A P only P B P only Q C P and Q P D P and Q Q

1 marks

Answer: A

This question in 0970/22 Oct/Nov 2025