- AHands
- BMortal
- CPestle
- DSaw
Explanation:
A saw is a tool consisting of a tough blade, wire, or chain with a hard toothed edge.
The saw is used to cut stems from the plants.
Mortar and pestle is a set of two simple tools used since the stone age to prepare ingredients or substances by crushing and grinding them into a fine paste or powder in the kitchen, laboratory, and pharmacy.
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$(I)$ Humidity in atmosphere is relatively more in the area where light become limiting factor for plants
$(II)$ Increase in light as factor affecting photosynthesis beyond a point causes breakdown of chlorophyll and a decrease in photosynthesis occurs
$(III)$ The $C_4$ plants respond to higher temperatures and show higher rates of photosynthesis while $C_3$ plants have a much lower temperature optimum