B1 - Flashcards

B1 Revsion Cards - Evolution

Natural Selection - 'Survival of the fittest'

Lamarck Thoery- Was based on the idea that if a characteristic was used a lot by an organism then it would become more developed during its a lifetime.

Variation- Is where the same speicies have differences in characteristics. These are genetic and environmental.

Sexual Reproduction – The joining (fusion) of male and female gametes. The mixture of the genetic information from two parents leads to variety in the offspring.

Plants can be cloned by:
-Cuttings are taken from a good parent plants, and then planted to produce gentically identical copies.
- Tissue Culture- A few plant cells are put into a growth medium with horones and they grow into new plants.

Genetic Engineering - The use of enzymes to copy a useful gene from one organism's chromosomes into the cells of an other.

B1 Revision Cards- Decay Process

Materials decay because they are broken down ( digested) by microorganisms.
Microorganisms are more active and digest materials faster in warm, moist, areobic conditions.

B1 Revision Cards - Energy in Biomass

Radiation from the sun is the source of energy for most living organisms. The transfer of light to chemical energy occurs in photosynthesis. This energy is then stored in cells.

B1 Revision Cards- Adaptations

Animals and plants are also adapted for survival in the conditions in which they live.