How are the environmental agents for uniting sperm and egg d

Solution

Bryophytes and Pines (gymnosperms) differ in the agent that helps in uniting sperm and egg

BRYOPHYTES: depend on water for fertlization. That\'s why they are also called amphibians of plant kingdom. With splash of water antherozoids fall on archegonia that helps in fertilisation.

PINES: depend upon wind for pollination. Male cones produce pollen grains which are blown by wind and fall on ovules in female cones to cause fertilisation.