Obtaining Food - Plants
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Obtaining Food - Plants
Obtaining Food Plants
Higher Biology - Unit Two - Obtaining Food - Plants
Which is mobile? Which is sessile?
Animals or Plants?
Animals are mobile
Plants are sessile
What is the word for an organism that cannot manufacture its own food and must obtain energy by consuming other things eg animals?
What is the word for an organism that can make its own food eg plants?
What element is need by organisms to make proteins?
Where do plants get nirtogen from?
What do plants compete for?
How are some plants leaves arranged so they are as efficient at catching light as possible?
In a mosaic pattern
Is interspecific competition more or less intense than intraspecific competition
Less, as plants have different growth forms and nutrient requirements
Give an example of a plant species that shows dominance over another
Pine trees stop light reaching the forest floor and stop any other plants growing
Where bracken grows other plants must grow before the dense cover develops
Gold-of-pleasure produces a toxin to stop the growth of other plants
Why is the number of species low when the level of selective grazing is low?
As the dominant grasses grow and outcompete other species
Why is the number of species high when the level of selective grazing is medium?
Dominant grasses kept in check. Other species can survive
Why is the number of species low when the level of selective grazing is high?
Overgrazing may damage less vigorous species
When plants make food is there a net gain or loss of food in:
a) net gain of food
b) net loss of food
What is a plant's compensation point?
When there is no net gain or loss of carbohydrate and no net gas exchange
(rate of photosynthesis = rate of respiration)
What is a sun plant?
A plant that thrives in brightly illuminated habitats
What is a shade plant?
A plant that thrives in dimly lit habitats
What is a plant's compensation period?
The time taken by a plant to reach its compensation point after having been in darkness
Which plant will reach its compensation point faster? Sun or shade plant?
A shade plant
How are shade plants able to survive in poorly illuminated areas?
They have a greater ability to use dim light
They produce their flowers and seeds early in the year before the dense leaf canopy blocks out most of the light and reduces photosynthesis to a minimum