Question
The diagram shows part of the water cycle.
Which row identifies the different parts of the water cycle?
▶️Answer/Explanation
Ans: B
The correct answer is B, because :
- Water is the universal solvent and mostly all organisms need it for their survival. This importance made it, for us to know more about it.
- Water vapour becoming clouds is based on Condensation principle.
- Clouds pour water onto surface through precipitation (snow or ice).
- Plants releases water vapour based on transpiration principle.
Question
What is the pathway taken by water from the soil to the leaf?
A root hair cells → root cortex → mesophyll → xylem
B root hair cells → root cortex → xylem → mesophyll
C root cortex→ root hair cells → mesophyll → xylem
D root cortex → root hair cells→ xylem → mesophyll
▶️Answer/Explanation
Ans B
The correct answer is B, because :
Absorption is the process of intake of water from soil to the plant tissues.
It follows the following pathway in general,
Root hair cells to root cortex through either diffusion or active transport and then from root cortex to xylem and at last to mesophyll tissue in the leaf.
Question
The diagram shows the pathway of water molecules through a leaf and out to the environment.
mesophyll cell → process X → air space → process Y → stomata
Which statements are correct?
- Process X is active transport.
- Process X is evaporation.
- Process Y is diffusion.
- Process Y is osmosis.
A) 1 and 3
B) 1 and 4
C) 2 and 3
D) 2 and 4
▶️Answer/Explanation
Ans: C
The correct answer is C, because :
Mesophyll cells are present in leaf and they are responsible for photosynthesis, and from them water molecules needs to escape to air space crossing upper epidermis through evaporation method.
From airspace, water molecules reach other site of leaf containing stomata, as there is no barrier to cross except membrane simply through diffusion it crosses and reaches stomata.
Question
A The plant absorbs less water from the soil.
B The plant absorbs more water from the soil.
C The plant loses water to the soil.
D The plant loses mineral ions to the soil.
▶️Answer/Explanation
A
The correct answer is A, because :
Water present in the soil is absorbed by plant by it’s root hair cells, and these play an important role in water uptake from soil.
So, indirectly if root hair cells are less then the plant absorbs less water and if they are more then they will absorb more.
Plant through its mechanisms at root hair cells, it doesn’t lose either water or minerals into soil