Plant Diversity

How does indoleacetic acid ( ?natural auxin) affect fruit development?
A) preventing pollination
B) inhibiting formation of the ovule
C) promoting gene expression in cambial tissue
D) promoting rapid growth of the ovary
E) inducing the formation of brassinosteroids


Ethylene, as an example of a plant hormone, may have multiple effects on a plant, depending on all of the following except the
A) site of action within the plant.
B) developmental stage of the plant.
C) concentration of ethylene.
D) altered chemical structure of ethylene from a gas to a liquid.
E) readiness of cell membrane receptors for the ethylene.


On the subject of positive gravitropism exhibited by plant roots,
A) it is mediated by auxin as for phototropism.
B) it depends on more rapid elongation of some cells than other cells.
C) gravity causes auxins to accumulate on the lower side of roots.
D) the phenomenon depends upon inhibition of cell elongation of certain root cells by auxins.
E) All of the above are correct.


In order for a plant to initiate chemical responses to herbivory,
A) the plant must be directly attacked by an herbivore.
B) volatile "signal" compounds must be perceived. ( I was thinking B)
C) gene-for-gene recognition must occur.
D) phytoalexins must be released.
E) all of the above must happen.

Which of the following are examples or parts of plants' systemic acquired resistance against infection?
A) phytoalexins
B) salicylic acid
C) pheromones
D) A and B only (This?)
E) A, B, and C

Location of the microsporangia:
A) stamen - possible?
B) carpel
C) petals
D) sepals
E) receptacle

Location of the ovary:
A) stamen
B) carpel picked this
C) petals
D) sepals
E) receptacle

Bio_man 8)

Now pay if forward and help answer questions

Thanks for the help!

I had two quick questions though xD

I was thinking maybe the first one was C? And the question about plants' systemic acquired resistance against infection to be only the first two? Because aren't pheromones used to attract incests.

I obtained the answers from a test-bank .

Oh

I got some other questions for my lab sheet. Could you help with those? I have some more but these were the ones I couldn't find in the book (or maybe I skimmed too fast xD). Thanks again for helping.


Why should one expect the soil?s nitrogen not to be contained solely within the rhizoids of  the Polytrichum mosses?
A) Rhizoids are associated with fungi that inhibit mineral transfer from soil to rhizoids.
B) Rhizoids are not absorptive structures.
C) Rhizoids consist of single, tubular cells or of filaments of cells.
D) Rhizoids lack direct attachment to the moss sporophytes.


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The 2-m height attainable by Polytrichum moss is at the upper end of the size range reached by mosses. What accounts for the relative tallness of Polytrichum?
A) the cuticle that is found along the ridges of ?leaves?
B) ?leaves? that are more than one-cell-layer thick
C) high humidity of surrounding air provides support against gravity
D) reduced size, mass, and persistence of the sporophytes allows gametophores to grow taller
E) the presence of conducting tissues in ?stem?

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Among bryophytes, only the sporophytes of mosses and hornworts have stomata, whereas
stomata are missing from liverwort sporophytes. If the common ancestor of all bryophytes
had sporophytes that bore stomata, then which of these might account for their absence
from liverwort sporophytes? If, in contrast to early mosses and hornworts, early liverwort
sporophytes had
A) more-effective transport of glucose from gametophyte to sporophyte.
B) increased robustness (i.e., thicker, more massive tissues).
C) increased nutritional independence from the gametophyte.
D) decreased need to broadcast spores long distances.

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A major change that occurred during the evolution of plants from their algal ancestors was
the origin of a branched sporophyte. What advantage would branched sporophytes provide in this stage of the life cycle?
A) increased gamete production
B) increased spore production
C) increased potential for independence of the diploid stage from the haploid stage
D) increased fertilization rate
E) increased size of the diploid stage

-------------------

Closer observation reveals that these small spheres are produced on tiny extensions of the
stem, each of which helps compose the strobilus. These small, spore-producing extensions
of the stem are called
A) scales
B) sporangia
C) sporophylls
D) gametangia


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 ________ are the most successful group of nonvascular plants and can be found in tropical environments
A.   sorus
B.   liverwarts
C.   ferns
D.   Bryophyta


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Sperm forming tissue is found in the __________.
     A) Antheridia
     B) gametangia
     C) archegonia
     D) sporangia


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In nonvascular plants female gametophytes will form when _______  divide by mitosis.
      A)  sporangium
      B)  sporophyte
      C)  motile sperm
      D)  megaspores

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Carpels and stamens are
A) sporophyte plants in their own right.
B) gametophyte plants in their own right.
C) gametes.
D) spores.
E) modified sporophylls.

Why should one expect the soil?s nitrogen not to be contained solely within the rhizoids of  the Polytrichum mosses?
A) Rhizoids are associated with fungi that inhibit mineral transfer from soil to rhizoids.
B) Rhizoids are not absorptive structures.
C) Rhizoids consist of single, tubular cells or of filaments of cells.
D) Rhizoids lack direct attachment to the moss sporophytes.

-------

The 2-m height attainable by Polytrichum moss is at the upper end of the size range reached by mosses. What accounts for the relative tallness of Polytrichum?
A) the cuticle that is found along the ridges of ?leaves?
B) ?leaves? that are more than one-cell-layer thick
C) high humidity of surrounding air provides support against gravity
D) reduced size, mass, and persistence of the sporophytes allows gametophores to grow taller
E) the presence of conducting tissues in ?stem?

--------------

Among bryophytes, only the sporophytes of mosses and hornworts have stomata, whereas
stomata are missing from liverwort sporophytes. If the common ancestor of all bryophytes
had sporophytes that bore stomata, then which of these might account for their absence
from liverwort sporophytes? If, in contrast to early mosses and hornworts, early liverwort
sporophytes had
A) more-effective transport of glucose from gametophyte to sporophyte.
B) increased robustness (i.e., thicker, more massive tissues).
C) increased nutritional independence from the gametophyte.
D) decreased need to broadcast spores long distances.

--------

A major change that occurred during the evolution of plants from their algal ancestors was
the origin of a branched sporophyte. What advantage would branched sporophytes provide in this stage of the life cycle?
A) increased gamete production
B) increased spore production
C) increased potential for independence of the diploid stage from the haploid stage
D) increased fertilization rate
E) increased size of the diploid stage

-------------------

Closer observation reveals that these small spheres are produced on tiny extensions of the
stem, each of which helps compose the strobilus. These small, spore-producing extensions
of the stem are called
A) scales
B) sporangia
C) sporophylls
D) gametangia

Carpels and stamens are
A) sporophyte plants in their own right.
B) gametophyte plants in their own right.
C) gametes.
D) spores.
E) modified sporophylls.

I answered what I could... Start a new topic next time, don't continue adding . Thanks.

Sorry, I thought you wanted to save space. I'll start a new topic right away xD

haha, there is infinite space .

that's true!

Wouldn't the statement Rhizoids are not absorptive structures be false? (chosen answer)

I think bio_man is right, it's

B) Rhizoids are not absorptive structures.