Make a list of any three outbreeding devices that flowering plants have developed and explain how they halp to encourage cross-pollination.

(a) State one difference and one similarity between geitonogamy and xenogamy. (b) Explain any three devices developed in flowering plants to discourage self pollination and encourage cross pollination.

Mention any three contrivances in flowers which favour cross-pollination.

Geitonogamous flowering plants are genetically autogamous but functionally cross-pollinated. Justify.

In Castor and Maize plants (a) Autogamy is prevented but not geitonogamy (b) Both autogamy and geitonogamy are prevented (c) Male and female flowers are borne by different plants (d) Anthers and stigma are placed at different positions to encourage cross pollination

Flowering plants have developed many devices to discourage self-pollination and to encourage cross-pollination. Explain three such devices.

Flowering plants have developed certain outbredding devices to discourage self-pollination and encourage cross-pollination. One of these is not an examples of such outbreeding device.

Explain the steps that ensure cross pollination in an autogamous flower.

Explain the steps that ensure cross pollination in an autogamous flower.

(a) Describe any two devices in a flowerings plant which prevent both autogamy and geitonogamy (b) Explain the events up to double fertialisation after the pollen tube enters one of the synergids in an ovule of an angisoperm.

Give any three characters that have developed during human evolution.