S3 Exam Flashcards
What is an community?
All the living organisms
What is a population?
A group of living organisms of the snake species
What are the most important factors shiv determine what types of life are found in an ecosystem?
Temperature changes
Moisture availability
Light
Nutrient availability
What are abiotic factors?
The non-living factors present in an ecosystem
Name 4 abiotic factors
Temperature
Moisture
pH
Light intensity
What are biotic factors?
Living factors in an ecosystem
Name 5 biotic factors
Disease Competition Predators Grazing Food availability
What do biotic factors impact?
The size of the population
What can we use to sample animals and plants?
Quadrats and pitfall traps
What are producers?
Green plants that get their energy from the sun and can make their food from photosynthesis
What are consumers?
Animals which have to eat plants and other animals
What is a primary consumer?
A consumer which eats plants / herbivore
What is a secondary consumer?
A consumer which eats other animals / carnivore
What are predators?
Animals which hunt for their prey?
What are prey?
Hunted animals
What do arrows in a food chain show?
The direction of energy flow
When does competition occur?
When any resource is limited
What may animals compete for?
Water, food, shelter
How many chromosomes do humans have?
46
During mitosis the number of cells……
Increases
Stage one mitosis
The chromosomes replicate
Stage 2 mitosis
The chromosomes become shorter and thicker and consist of 2 chromatids joined by a centromere
Stage 3 mitosis
The nuclear membrane disintegrates and the chromosomes line up at the equator. Each chromosome is attached by its centromere to the spindle threads that have been released from the spindle
Stage 4 mitosis
The pairs of chromatids are pulled apart and move to opposite poles of the cell as the spindle threads retract back into the spindle
Stage 5 mitosis
a group of chromatids gather at North and south poles of the cell
Stage 6 mitosis
A nuclear membrane forms around each group of cells and the cytoplasm divides to form 2 identical daughter cells
Why is mitosis important?
To ensure no genetic info is lost
Step one genetic engineering
1⃣ chromosome extracted and required gene identified
Step 2 genetic engineering
2⃣ gene cut out
Step 3 genetic engineering
Plasmid extracted
Step 4 genetic engineering
Plasmid cut open
Step 5 genetic engineering
5⃣ gene inherited into plasmid
Step six genetic engineering
Plasmid inserted into host cell
Step 7 genetic information
7⃣ bacterium grows and multiplies
Step 8 genetic engineering
Product mass produced by duplicates of plasmid
What substances can be made by genetic engineering?
Antibiotics Hormones Vaccines Enzymes for industry Anti-viral drugs
Nucleus function
Controls all cell activity and contains genetic info
Cell membrane function
Controls what enters and leaves the cell
Cytoplasm function
Site of all chemical reactions
Cell wall function
Helps give cells shape
Vacuole function
Contains cell sap
Chloroplast function
Site of photosynthesis
What is a habitat?
A place where an organism lives
What is reproduction?
The production of new members of a species
Name 2 types of reproduction
Sexual
Asexual
What type of reproduction involves only one parent?
Asexual
What are organising produced asexually known as?
Genetically identical organisms named clones
Why does asexual reproduction not produce variation?
All organisms are genetically identical
What type of reproduction involves 2 parents?
Sexual
Stamen function
Consists of the anther (containing pollen) and the filament
Anther function
Produces male gametes - pollen
Stigma function
Top of the carpel which collects pollen grains
Ovary function
Produces sex cells called ovules
Ovules function
Female gamete of a plant
Sepals function
To protect the unopened bud
What is pollination?
The transfer of polls from the anther to the stigma
What is reproduction?
The production of new members of a species
Name 2 types of reproduction
Sexual
Asexual
What type of reproduction involves only one parent?
Asexual
What are organising produced asexually known as?
Genetically identical organisms named clones
Why does asexual reproduction not produce variation?
All organisms are genetically identical
What type of reproduction involves 2 parents?
Sexual
Stamen function
Consists of the anther (containing pollen) and the filament
Anther function
Produces male gametes - pollen
Stigma function
Top of the carpel which collects pollen grains
Ovary function
Produces sex cells called ovules
Ovules function
Female gamete of a plant
Sepals function
To protect the unopened bud
What is pollination?
The transfer of polls from the anther to the stigma
What is reproduction?
The production of new members of a species
Name 2 types of reproduction
Sexual
Asexual
What type of reproduction involves only one parent?
Asexual
What are organising produced asexually known as?
Genetically identical organisms named clones
Why does asexual reproduction not produce variation?
All organisms are genetically identical
What type of reproduction involves 2 parents?
Sexual
Stamen function
Consists of the anther (containing pollen) and the filament
Anther function
Produces male gametes - pollen
Stigma function
Top of the carpel which collects pollen grains
Ovary function
Produces sex cells called ovules
Ovules function
Female gamete of a plant
Sepals function
To protect the unopened bud
What is pollination?
The transfer of polls from the anther to the stigma
What is reproduction?
The production of new members of a species
Name 2 types of reproduction
Sexual
Asexual
What type of reproduction involves only one parent?
Asexual
What are organising produced asexually known as?
Genetically identical organisms named clones
Why does asexual reproduction not produce variation?
All organisms are genetically identical
What type of reproduction involves 2 parents?
Sexual
Stamen function
Consists of the anther (containing pollen) and the filament
Anther function
Produces male gametes - pollen
Stigma function
Top of the carpel which collects pollen grains
Ovary function
Produces sex cells called ovules
Ovules function
Female gamete of a plant
Sepals function
To protect the unopened bud
What is pollination?
The transfer of polls from the anther to the stigma
What is reproduction?
The production of new members of a species
Name 2 types of reproduction
Sexual
Asexual
What type of reproduction involves only one parent?
Asexual
What are organising produced asexually known as?
Genetically identical organisms named clones
Why does asexual reproduction not produce variation?
All organisms are genetically identical
What type of reproduction involves 2 parents?
Sexual
Stamen function
Consists of the anther (containing pollen) and the filament
Anther function
Produces male gametes - pollen
Stigma function
Top of the carpel which collects pollen grains
Ovary function
Produces sex cells called ovules
Ovules function
Female gamete of a plant
Sepals function
To protect the unopened bud
What is pollination?
The transfer of polls from the anther to the stigma
What is reproduction?
The production of new members of a species
Name 2 types of reproduction
Sexual
Asexual
What type of reproduction involves only one parent?
Asexual
What are organising produced asexually known as?
Genetically identical organisms named clones
Why does asexual reproduction not produce variation?
All organisms are genetically identical
What type of reproduction involves 2 parents?
Sexual
Stamen function
Consists of the anther (containing pollen) and the filament
Anther function
Produces male gametes - pollen
Stigma function
Top of the carpel which collects pollen grains
Ovary function
Produces sex cells called ovules
Ovules function
Female gamete of a plant
Sepals function
To protect the unopened bud
What is pollination?
The transfer of polls from the anther to the stigma
What is reproduction?
The production of new members of a species
Name 2 types of reproduction
Sexual
Asexual
What type of reproduction involves only one parent?
Asexual
What are organising produced asexually known as?
Genetically identical organisms named clones
Why does asexual reproduction not produce variation?
All organisms are genetically identical
What type of reproduction involves 2 parents?
Sexual
Stamen function
Consists of the anther (containing pollen) and the filament
Anther function
Produces male gametes - pollen
Stigma function
Top of the carpel which collects pollen grains
Ovary function
Produces sex cells called ovules
Ovules function
Female gamete of a plant
Sepals function
To protect the unopened bud
What is pollination?
The transfer of polls from the anther to the stigma
What is reproduction?
The production of new members of a species
Name 2 types of reproduction
Sexual
Asexual
What type of reproduction involves only one parent?
Asexual
What are organising produced asexually known as?
Genetically identical organisms named clones
Why does asexual reproduction not produce variation?
All organisms are genetically identical
What type of reproduction involves 2 parents?
Sexual
Stamen function
Consists of the anther (containing pollen) and the filament
Anther function
Produces male gametes - pollen
Stigma function
Top of the carpel which collects pollen grains
Ovary function
Produces sex cells called ovules
Ovules function
Female gamete of a plant
Sepals function
To protect the unopened bud
What is pollination?
The transfer of polls from the anther to the stigma
What is reproduction?
The production of new members of a species
Name 2 types of reproduction
Sexual
Asexual
What type of reproduction involves only one parent?
Asexual
What are organising produced asexually known as?
Genetically identical organisms named clones
Why does asexual reproduction not produce variation?
All organisms are genetically identical
What type of reproduction involves 2 parents?
Sexual
Stamen function
Consists of the anther (containing pollen) and the filament
Anther function
Produces male gametes - pollen
Stigma function
Top of the carpel which collects pollen grains
Ovary function
Produces sex cells called ovules
Ovules function
Female gamete of a plant
Sepals function
To protect the unopened bud
What is pollination?
The transfer of polls from the anther to the stigma
What is reproduction?
The production of new members of a species
Name 2 types of reproduction
Sexual
Asexual
What type of reproduction involves only one parent?
Asexual
What are organising produced asexually known as?
Genetically identical organisms named clones
Why does asexual reproduction not produce variation?
All organisms are genetically identical
What type of reproduction involves 2 parents?
Sexual
Stamen function
Consists of the anther (containing pollen) and the filament
Anther function
Produces male gametes - pollen
Stigma function
Top of the carpel which collects pollen grains
Ovary function
Produces sex cells called ovules
Ovules function
Female gamete of a plant
Sepals function
To protect the unopened bud
What is pollination?
The transfer of polls from the anther to the stigma
What is reproduction?
The production of new members of a species
Name 2 types of reproduction
Sexual
Asexual
What type of reproduction involves only one parent?
Asexual
What are organising produced asexually known as?
Genetically identical organisms named clones
Why does asexual reproduction not produce variation?
All organisms are genetically identical
What type of reproduction involves 2 parents?
Sexual
Stamen function
Consists of the anther (containing pollen) and the filament
Anther function
Produces male gametes - pollen
Stigma function
Top of the carpel which collects pollen grains
Ovary function
Produces sex cells called ovules
Ovules function
Female gamete of a plant
Sepals function
To protect the unopened bud
What is pollination?
The transfer of polls from the anther to the stigma
What is reproduction?
The production of new members of a species
Name 2 types of reproduction
Sexual
Asexual
What type of reproduction involves only one parent?
Asexual
What are organising produced asexually known as?
Genetically identical organisms named clones
Why does asexual reproduction not produce variation?
All organisms are genetically identical
What type of reproduction involves 2 parents?
Sexual
Stamen function
Consists of the anther (containing pollen) and the filament
Anther function
Produces male gametes - pollen
Stigma function
Top of the carpel which collects pollen grains
Ovary function
Produces sex cells called ovules
Ovules function
Female gamete of a plant
Sepals function
To protect the unopened bud
What is pollination?
The transfer of polls from the anther to the stigma
What is reproduction?
The production of new members of a species
Name 2 types of reproduction
Sexual
Asexual
What type of reproduction involves only one parent?
Asexual
What are organising produced asexually known as?
Genetically identical organisms named clones
Why does asexual reproduction not produce variation?
All organisms are genetically identical
What type of reproduction involves 2 parents?
Sexual
Stamen function
Consists of the anther (containing pollen) and the filament
Anther function
Produces male gametes - pollen
Stigma function
Top of the carpel which collects pollen grains
Ovary function
Produces sex cells called ovules
Ovules function
Female gamete of a plant
Sepals function
To protect the unopened bud
What is pollination?
The transfer of polls from the anther to the stigma
What is reproduction?
The production of new members of a species
Name 2 types of reproduction
Sexual
Asexual