• Sat
  • Jul 26, 2014
  • Updated: 2:03am

Plant Physiology

Trees mysteriously vandalised may pose danger

At least three towering, exotic trees have fallen victim to a mysterious and bizarre act of vandalism that will lead to their slow death - and which could endanger people and property.

Wednesday, 15 August, 2012, 10:47pm

Eating the Sun

Eating the Sun by Oliver Morton Fourth Estate HK$128

15 Nov 2009 - 12:00am

Group spells out tree-care code

A leading conservation group trying to save trees in tourist spots from damage has issued a 'code of tree appreciation', which it hopes will prompt people to take better care of their towering green neighbours.

16 Jul 2007 - 12:00am

Desert plants adapt to harsh conditions

Perennial desert plants have evolved three major ways to deal with the harsh desert environment.

The plants take up rainwater rapidly through a mass of tiny roots. They can survive a prolonged dry season by storing a lot of water in their tissues. They conserve water by having a slow rate of transpiration, thus reducing water loss through their stomata or pores.

18 Jul 2000 - 12:00am

Animals leave telltale signs on tree trunks

It is never easy to see wild animals in the forest because most of them are shy. Sometimes, the animals are cleverly camouflaged.

However, we can guess what kinds of animals are around the forest by taking a close look at the signs on tree trunks.

Badgers and rodents make use of trees to clean their paws and usually leave claw marks and mud at the tree's base.

16 May 2000 - 12:00am

Ask mr Brain...all will be explained

How do rain forests produce so much oxygen if there are not many rain forests left? All trees, not just those in rain forests, produce oxygen. Because photosynthesis takes place in rain forest trees year-round, they produce more oxygen than other forests, which become dormant during the winter.

15 Feb 2000 - 12:00am

Ask mr Brain...all will be explained

Why do leaves change colour in autumn? There are scientific explanations as to why leaves change colour but there are also many myths and folk tales surrounding this phenomenon. Each year, hundreds of Americans go to New Hampshire just to admire the beauty of the autumn foliage.

24 Jul 1999 - 12:00am

Absorption of water by roots

Figure 1 shows a diagrammatic cross-section of a young dicotyledonous root. The root hairs are the structures responsible for the absorption of water and gaseous exchange.

25 Mar 1999 - 12:00am

Carnivorous leaves show their true colours

Leaves are not simply green and flat. They may be scarlet, spotted or scented, move, sweat or even trap prey.

These modifications have evolved to allow plants to survive in special habitats or circumstances.

The leaflets of mimosa fold shut instantly when touched - probably to discourage animals from eating the plant. They open out again about 15 minutes later.

30 Nov 1998 - 12:00am

Leaves droop when touched

MIMOSA Pudica is a straggling weed which can be found locally in the Hongkong countryside, especially on recently reclaimed wasteland.

The plant grows to 45 cm in height. Its spherical pink flowers can be easily be seen during late summer.

21 Jul 1993 - 12:00am