Biology 2a Flashcards
List the three structures in order of size.
a) Organs
b) Cells
c) Tissues
d) Organism
e) Organ systems
Cells Tissues organs systems organism
What is the role of glandular tissue?
To produce and secrete chemicals like enzymes and hormones.
Where do the chemical reactions take place in the cell?
In the cytoplasm.
How is osmosis different to diffusion?
Osmosis is just regarding the movement of water molecules.
Explain the role of osmosis in the large intestine
To remove water from faeces in order to hydrate the body.
How are palisade leaf cells adapted for photosynthesis?
Full of chloroplasts to absorb light.
Large surface area.
Thin shape to fit lots at the top of the leaf.
How are red blood cells adapted to carry oxygen?
Concave shape for a large surface area.
Packed full of haemoglobin.
No nucleus for extra space for haemoglobin.
Define diffusion
The movement of molecules from an area of high concentration to an area of low concentration over a partially permeable membrane
State 3 plant organs
Leaves
Roots
Stem
Give the 3 types of plant tissue and their functions.
Mesophyll - To photosynthesise.
Xylem and Phloem - Transport of materials.
Epidermal - Covers the whole plant.
Give the word and balanced symbol equation for photosynthesis.
Carbon dioxide + Water = Glucose + Oxygen
6CO2 + 6H2O = C6H12O6 + 6O2
Give the limiting factors of photosynthesis.
Carbon dioxide concentration
Temperature
Light intensity.
How can we artificially create ideal conditions for plant growth?
Use greenhouses to trap heat
Give artificial light
Paraffin heaters give off carbon dioxide and heat.
Greenhouses limit the risk to plants from pests
Give 5 ways in which plants use glucose
Production of proteins Respiration Stored as starch Stored in seeds as lipids Converted to cellulose for cell walls.
Give the organelles of
a) Yeast
b) Bacteria
a) Yeast - Cell wall, cell membrane, nucleus and cytoplasm.
b) Bacteria - Cell wall, cell membrane, cytoplasm and a bundle of DNA (NO NUCLEUS)
