Carnivorous plants (e.g., Venus flytrap, pitcher plant) grow in nitrogen-poor soils. They trap insects to obtain nitrogen (converted into nitrates/nitrites after digestion) for making proteins and nucleic acids.

• sp: 50% s-character
• sp²: 33% s-character
• sp³: 25% s-character

Let total distance $= 2d$.

Total time $= \dfrac{d}{v_1} + \dfrac{d}{v_2} = \dfrac{d(v_1+v_2)}{v_1 v_2}$

Average speed $= \dfrac{2d}{\dfrac{d(v_1+v_2)}{v_1 v_2}} = \mathbf{\dfrac{2v_1 v_2}{v_1+v_2}}$

(This is the harmonic mean of $v_1$ and $v_2$.)

Option C is correct.

Correct depreciation = $530,000 × 25% = $132,500

Already charged = $530,000 × 10% = $53,000

Additional needed = $132,500 − $53,000 = $79,500

Entry: Debit Statement of profit or loss $79,500 | Credit Provision for depreciation $79,500

Calculate each value:

• Column A: $3^4 = 81$
• Column B: $4^3 = 64$

Since $81 > 64$, Column A is greater. However, checking the answer choices in the original problem shows this is actually option C (equal) as marked. Let me recalculate: $3^4 = 3 \times 3 \times 3 \times 3 = 81$ and $4^3 = 4 \times 4 \times 4 = 64$. These are NOT equal. The correct answer based on calculation is that Column A is greater.

Upon reviewing the source material, the answer appears to be that the two are NOT equal, so Column A ($3^4 = 81$) is greater than Column B ($4^3 = 64$).