igcse biology chapter 14.2 reproduction in plants

In flowering plants, which part of the flower does the pollen tube grow through during fertilisation?

• Ovary

• Style

• Filament

• Anther

Which statement about fertilisation in flowering plants is correct?

• The pollen nucleus fuses with the ovary wall.

• Fertilisation occurs on the surface of the stigma.

• The male gamete fuses with the female gamete inside the ovule.

• The pollen grain itself enters the ovule.

The pollen tube secretes enzymes to:

• Stimulate ovule division

• Digest a path through the style tissue

• Trigger seed germination

• Attract other pollen grains

In self-pollination, pollen is transferred from:

• Anther to stigma of the same flower or same plant

• Anther to stigma of another plant of a different species

• Stigma to ovule of the same flower

• Anther to style of a different flower

What is cross-pollination?

• The transfer of pollen from an anther to the stigma of the same flower

• The transfer of pollen from an anther to the stigma of a different flower on the same plant

• The transfer of pollen from an anther to the stigma of a flower on a different plant of the same species

• The transfer of pollen from one plant to another plant of a different species

Which structure of a flower produces the female gametes?

• Anther

• Filament

• Ovary

• Stigma

The brightly coloured petals of an insect-pollinated flower mainly function to:

• Reflect sunlight onto the anther

• Attract pollinators such as bees

• Protect the ovary from heat

• Store nectar for insects

The male gametes in a flower are produced by:

• The stigma

• The pollen grains

• The style

• The ovules

Which of the following sequences is correct?

• Pollination → fertilisation → seed formation → fruit formation → germination

• Fertilisation → pollination → seed formation → germination

• Germination → pollination → fertilisation → seed formation

• Pollination → seed dispersal → fertilisation

Which combination of features in a flower most strongly promotes cross-pollination and prevents self-fertilisation?

• Large, sticky pollen; stigma and anthers mature at the same time; enclosed reproductive organs

• Smooth, light pollen; long, feathery stigmas; anthers positioned outside petals

• Brightly coloured petals; nectar; stigma and anthers mature at different times

• Heavy pollen grains; stigma and anthers positioned close together