#plants

7 public notes

How legumes gain usable nitrogen through root partners

Many legumes form root nodules containing bacteria that convert atmospheric nitrogen into forms the plant can use. The plant supplies carbon compounds and a suitable living environment in return. The root does not perform the conversion alone, and the partnership's effectiveness depends on compatible organisms and conditions.

Nature & Earth♡ 0🔖 0

plants

Pollination is not the same event as fertilisation

Pollination moves pollen to a flower's receptive surface, called the stigma. Fertilisation happens later if compatible pollen develops successfully and sperm cells reach an ovule. A bee visiting a flower can help with the first step, but the visit does not guarantee that seeds will form.

Nature & Earth♡ 0🔖 0

plants

How dandelion seeds stay airborne

The familiar dandelion parachute is a ring of fine bristles attached to a small, seed-containing fruit. The bristles create aerodynamic drag, slowing its fall and giving moving air more time to carry it away. Its lightweight, porous structure works differently from a solid umbrella catching the wind.

Nature & Earth♡ 0🔖 0

plants

Why a viable seed may not germinate immediately

A living seed can remain dormant even when some conditions appear suitable for growth. Depending on the species, germination may require changes such as a period of cold, light exposure or weakening of the seed coat. Dormancy can help prevent a seed from starting growth during a misleading short spell of good weather.

Nature & Earth♡ 0🔖 0

plants

Why some leaves change colour before falling

As many deciduous trees prepare to shed leaves, green chlorophyll breaks down and is no longer replaced at the same rate. Yellow and orange pigments already present become easier to see. Some species also produce red pigments, so autumn colour reflects several chemical changes rather than green simply turning red.

Nature & Earth♡ 0🔖 0

plants

How water reaches the upper branches of a tree

Water moves upward through a tree's xylem largely because evaporation from leaves creates tension in connected water columns. Water molecules hold together through cohesion, allowing this pull to extend down the transport pathway. The trunk does not contain a heart that pumps water from the roots to the crown.

Nature & Earth♡ 0🔖 0

plants

How leaves balance gas exchange with water loss

Tiny pores called stomata allow gases to move between a leaf and the air. Opening them lets carbon dioxide enter for photosynthesis, but also allows water vapour to escape. Guard cells adjust the openings, helping the plant balance its need for carbon dioxide against the risk of losing too much water.

Nature & Earth♡ 0🔖 0