Levels of Organization
The smallest level of organization in a living thing
Cell
This organ of the plant mainly performs photosynthesis
Leaves
This system absorbs water and nutrients from the soil
Root System
This process uses sunlight to make sugar
Photosynthesis
Growth toward light is called this
Phototropism
A group of similar cells working together to perform a job
Tissue
This organ of the plan absorbs water from the soil
Roots
This system contains leaves, stems, and flowers
Shoot System
This tissue transports water upward from the roots
Xylem
Roots growing downward is an example of this response
Gravitropism (Geotropism)
Different tissues working together form this level
Organ
This organ of the plant supports the plant and transports materials
Stem
Which organ system is MOST responsible for photosynthesis?
Shoot System
This tissue transports sugar made in the leaves
Phloem
Why do stomata close on hot days?
To reduce water loss
Put these in order from smallest to largest:
Organism, Cell, Organ System, Tissue, Organ
Cell → Tissue → Organ → Organ System → Organism
These tiny openings control gas exchange and water loss
Stomata
This type of root system has one large main root that grows deep into the soil
Taproot
Name the three things needed for photosynthesis
Water, CO2, and Sunlight
These cells open and close stomata
Guard Cells
Explain why multicellular organisms need specialized cells
Different cells perform different jobs to help the organism survive efficiently
A cactus has thick stems and spines. How do these structures help it survive?
Thick stems store water and spines reduce water loss/protect the plant
This type of root system spreads out near the surface and helps anchor plants firmly in the soil
Fibrous
Which organelle does Photosynthesis mostly occur?
Chloroplast
What do plant cells have outwardly that animal cells do not?
Cell Wall