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3 years ago

Which of the following statements about xylem and phloem is true?

Biology

2 answers:

Natalija [7]3 years ago

8 0

Answer:

C. Xylem moves water up, and phloem moves food down

Explanation:

The xylem moves water up, and the phloem moves food down. So, option (C) is correct answer.

Wewaii [24]3 years ago

5 0

C. Xylem moves water up, and phloem moves food down

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Two teams are playing tug-of-war. Each team is pulling on the rope with a different force—Team X with 500 newtons and Team Y wit

Nikitich [7]

No question, but team x has 200 more newtons than team y and therefore will win.

5 0

3 years ago

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In a plant, leaf color and leaf shape are controlled by two linked genes Leaves of the wild-type plant are red. A recessive muta

Brrunno [24]

Solution :

Red is dominant over the white leaves and pointed is dominant over smooth.

Red = R , white = r

Pointed = P , smooth = p

Red, pointed x white,smooth ------ Parents

RRPP rrpp

RP rp ----------------- Gametes

RrPp -------- $F_1$

(red, pointed)

When this $F_1$ is test crossed,

RrPp x rrpp ---- $F_1$ test cross

Gametes → rp

RP ---------- RrPp - red, pointed - 36 parental type

Rp ---------- Rprp - red, smooth - 14 re- combination

rP ----------- rrPp - white pointed - 10 re- combination

rp ----------- rrpp - white, smooth - 40 - parental type

Total = 100

As this ratio is deviating from 1:1:1:1, it indicated the two genes are linked.

Linkage strength = percentage of crossing over = map distance between the genes.

Percentage crossing = recombination frequency = percentage of recombination.

Recombination frequency $=\frac{\text{total no. of recombination}}{\text{total no. of progeny}}\times 100$

$=\frac{14+10}{100} \times 100$

= 24 %

= 24 map units

4 0

3 years ago

Which of the following statements is true? Friction works in the direction opposite of motion. Lubrication can be used to increa

bekas [8.4K]

Hello sorry for the late replay but my best answer is going to be
A.)
Friction works in the direction opposite of motion

4 0

3 years ago

Read 2 more answers

Which of these structures would be found

kirill [66]

Answer:

A and B

Explanation:

Only plants have cell membranes and chloroplast.

6 0

4 years ago

A student inoculates a gelatin tube and places it at 37C for the week. When he comes back he takes the tube out of the incubator

ycow [4]

<h2>Gelatin </h2>

Explanation:

Gelatin is a differential medium which tests the ability of an organism to produce an exoenzyme, called gelatinase (this enzyme hydrolyzes gelatin)

When gelatin is at a temperature below 32°C (or within a few degrees thereof), it is a semisolid material and at temperatures above 32°C, it is a viscous liquid

When gelatin is broken down, it can no longer solidify and if an organism can break down gelatin, the areas where the organism has grown will remain liquid even if the gelatin is refrigerated

No the conclusion by student is not right because the tube must be runny after incubation followed by refrigeration to be considered gelatinase positive

3 0

3 years ago