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Anna [14]
3 years ago
7

5. You are walking through the various sections of an arboretum garden. As you move through the section specializing in "desert

plants," you notice that one of the trees has a gall forming in one area of the trunk near where it emerges from the soil. The plant has been infected by Rhizobium radiobacter. Would you expect this infection to trigger the tree’s "hypersensitive response"? a. Yes, because the hypersensitive response is the quickest way to limit the spread of Rhizobium throughout the plant. b. Yes, because the hypersensitive response is the last line of defense a plant can use against a pathogen. c. No, because Rhizbium radiobacter does not move through the plant. d. No, because Rhizobium radiobacter only infects a wounded area of the plant and those regions are already dead.
Biology
1 answer:
sertanlavr [38]3 years ago
6 0

Answer:

The correct answer is 'd' No, because Rhizbium radiobacter only infects wounded area of the plant and those regions are already dead.

Explanation:

Rhizobium is a genus of gram negative, soil bacteria that forms symbiotic relationship with certain plant, fixing nitrogen. However, soil borne plant pathogen, <em>Agrobacterium tumefaciens, </em>or rhizobium radiobacter, are tumor producing species that does not in anyway benefit the plant. The have a tendency to cause crown gall tumors by transfering T-DNA of its Ti plasmid intp a plant cell, where the T-DNA becomes integrated into the plant genome, Hence causing overproduction of plant growth hormones which ultimately results in tumor. A. tumefaciens does not elicit a typical Hypersensitivity response in a plant. As it enters only through wounds in the plant and these regions are already dead, hence no hypersensitivity response is produced by the plant.

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Which of these is a disadvantage of multicellular organisms?
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Multi cellular organisms are composed of many cells whereas unicellular organisms are composed of single cell. Multicellularity is indeed a progressive attribute of evolution where cells form tissue which forms organ and then organ system and finally an organism. Both multi cellular and unicellular organisms has advantages and disadvantages of their own. One of the main disadvantage of multi cellular organisms is that due to such a complex composition and functioning they require a large amount of energy for their maintenance and survival. Different organs and system require a huge amount of energy when it comes to comparison with unicellular organisms. A large amount of energy is also wasted in all these life processes. Though multi cellular organisms can survive in a variety of environmental conditions but then also their survival is difficult than any unicellular organism.

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3 years ago
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Answer: Hardy Weinberg

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5 0
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3 0
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In chickens, comb shape is determined by two independent genes (R and P). A walnut comb is produced when at least one dominant a
Aleksandr [31]

Answer:

Option B, Rr pp × rr Pp

Explanation:

Given

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Rose Comb - at least one dominant allele is present at the first locus and two recessive alleles are present at the second locus - R* pp

Pea comb - two recessive alleles are present at the first locus and at least one dominant allele is present at the second  - rr P*

Single comb - two recessive alleles are present at the first and the second locus  - rrpp

Parent are rose combed and pea combed

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will  produce

Walnut comb  with genotype Rr Pp

Single comb  with genotype rrpp

and pea comb  with genotype rrPp

Hence, option B is correct

8 0
3 years ago
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