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sp2606 [1]
4 years ago
9

A cross-sectional view of a log shows a concentric pattern. Which part of the stem gives rise to this pattern? A. Phloem

Biology
2 answers:
8090 [49]4 years ago
7 0
<span>A cross-sectional view of a log shows a concentric pattern. Which part of the stem gives rise to this pattern?
B. Xylem
as it </span><span>contribute for most of a tree's growth in diameter.</span>
slega [8]4 years ago
4 0
The part of the stem that gives rise to this pattern is : B. xylem

xylem is responsible in transporting water and nutrients. It die after a year or so and will leave the concentric pattern as it die

hope this helps
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The basic building of basic of basic blocks of a protein are?
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A food chain consists of phytoplankton, zooplankton, shrimp, and herring. If the bacteria produces 173,000 kJm-2 year-1 of energ
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Answer:

The trophic efficiency between the primary and the secondary produces is 18.064 %

Explanation:

The trophic efficiency is the ratio or the fraction obtained by dividing the energy used for growth at a trophc level by the level of energy supplied at the the next lower trophic level.

The given parameters are;

The energy produced by the bacteria (primary consumer) = 173,000 kJ/(m²/y)

The energy contained in the plankton = 28,000 kJ/(m²/y)

The energy contained in the shrimp = 3,100 kJ/(m²/y)

The energy contained in the herring = 150 kJ/(m²/y)

Therefore, we have;

Energy supplied at the primary trophic level = 173,000 kJ/(m²/y)

The energy used for growth (contained) in the secondary trophic level (secondary consumer)  = 28,000 + 3,100 + 150 =  31,250 kJ/(m²/y)

Trophic \ efficiency = \dfrac{Energy \ used \ for\ growth\ (Secondary\  consumer)  }{ Energy \ Supplied \ (Primary \  consumer) } \times 100

Trophic \ efficiency = \dfrac{31,250}{ 173,000} \times 100 =  18.064 \ \%

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