Transport in Plants Quiz - CBSE Class 7 Science
Free practice quiz: Transport in Plants (CBSE Class 7 Science). 17 multiple-choice questions with answers and explanations. Play online, no sign-up needed.
Play all 17 questions freeSample questions
What is the primary function of xylem in plants?
- Transport of water and minerals
- Transport of food
- Transport of gases
- Transport of hormones
Show answer
Answer: A. Transport of water and minerals
Xylem is a type of tissue in vascular plants that primarily transports water and dissolved minerals from the roots to the rest of the plant.
What is the role of phloem in plants?
- Transport of water and minerals
- Transport of food
- Transport of gases
- Transport of proteins
Show answer
Answer: B. Transport of food
Phloem is responsible for transporting the food (nutrients and sugars) produced during photosynthesis from the leaves to other parts of the plant.
Which theory explains the movement of water through xylem?
- Root Pressure Flow
- Osmosis Theory
- Cohesion-Tension Theory
- Transpiration Theory
Show answer
Answer: C. Cohesion-Tension Theory
The Cohesion-Tension Theory states that water moves up the plant through xylem due to cohesive forces between water molecules and tension created by water evaporation at the leaves (transpiration).
Which structure in plants prevents excessive water loss during transpiration?
- Root hairs
- Stomata closure
- Xylem vessels
- Phloem sap
Show answer
Answer: B. Stomata closure
When water is scarce, stomata can close to reduce water loss despite incurring a limitation on gas exchange, thus preventing excessive transpiration.
Which specialized plant cells facilitate rapid transport of water?
- Root hair cells
- Vessel elements
- Guard cells
- Spongy mesophyll cells
Show answer
Answer: B. Vessel elements
Vessel elements are specialized, elongated cells that connect to form continuous tubes in xylem tissue, optimizing the rapid transportation of water and minerals.