Biology Flashcards
What are the characteristics of life?
- Movement
- Sensitivity
- Reproduction
- Respiration
- Excretion
- Nutrition
- Growth
What is the definition of Growth?
Organisms increase there size/mass over time.
What is the definition of sensitivity?
Organisms respond to external conditions in order to optimise there condition.
What is the definition of reproduction?
Organisms produce new “copies” of themselves in order to continue species.
What is the definition of resperation?
organisms use glucose and oxygen to release energy for biological processes.
What is the definition of nutrition?
organisms absorb chemicals which are needed for biological processes.
What is the definition of Exertion?
Organisms remove waste products from there bodies.
What is the definition of Movement?
Organisms change the positions of there bodies.
What are the different types of invertebrates?
- Echinoderns
- Arthropods
. insects
. arachnids
. crustaceans
. myriapods - Mollusc
- Cnidarian
- Annelids
- Sponges
What are the characteristics for mammals?
Have fur, produce milk, give birth to live young.
What are the characteristics for reptiles?
Lay eggs on land, no fur or feathers.
What are the characteristics for birds
Have feathers, hollow bones, lay eggs
What are the characteristics for amphibians?
have larva stage, reproduce in water, breathe through skin.
What are the characteristics for fish?
Have fins, absorb oxygen through gills, live in water, lay eggs without shells.
What are the different parts of a leaf?
- epidermis
- cuticle (waterproof layer)
- palisade cells
- spongy mesophyll
- air gap
- pores
- stomata
What is the role of the epidermis and cuticle?
They prevent water loss through the top of the leaf and protect it from disease.
What is the role of the palisade cells?
They preform preform photosynthesis, contain many chloroplasts.
What is the role of the spongy mesophyll and air gap?
Allow the diffusion of co2 to palisade cells.
What is the role of the pores and stomata?
open and close to allow air in and out. open during the day to let in c02. Close at night to prevent water loss.
What is continuous and discontinuous variation?
Continuous = Can have any numerical value (within reason).
Discontinuous = has only a few fixed values.
What is the role of the Nucleus?
Controls the cell (contains DNA)
What is the role of the cell membrane?
Allows chemicals in and out.
What is the role of the cell wall?
Protects cell, gives structure.
What is the role of the chloroplast
Does photosynthesis.
