Exam (elaborations)

Ag Crop Physiology Final Exam 2022 with complete solution

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Ag Crop Physiology

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Ag Crop Physiology

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Uploaded on June 6, 2023
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ag crop physiology final exam 2022 with complete

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Ag Crop Physiology Final Exam 2022 with complete
solution
Define a plant hormone -Ans>>a plant hormone is an organic compound that is
synthesized in one part of the plant and translocated to another part, and in low
concentrations it will cause a physiological response

List the three primary groups of secondary metabolites and describe their chemical
difference. -Ans>>-terpenes
-phenolics
-nitrogen- containing compounds

What type of experiment did scientists conduct using Arabidopsis to help identify "floral
identity genes" in flowering plants? -Ans>>They used and ABC model, using petals,
sepals, stamen and carpel. They used mutations and measured the plants using this
model

If the soil is at field capacity(Yp=0) and the root hairs have a Yw= -0.3 and a Yp= 0.2,
what is the Ys? -Ans>>-0.5

If salt water intrusion should occur and the soil is still at field capacity and the Ys of the
soil = -3.0, the Yw of the root hairs becomes -1.1. This is caused by a
________________ pressure potential. -Ans>>lower

This was a direct effect of water moving _____________ the root hair cells. -Ans>>out
of

The process by which this water movement and change in water potential occurred is
called __________? -Ans>>diffusion

This plant growth regulator is a relatively new hormone called ________? -
Ans>>Brassinosteroids

Their effect on plant growth is similar to_____? -Ans>>Auxins

However they may stimulate ______________ production causing lateral root
formation. -Ans>>Ethylene

Although this growth hormone has been found to increase the yield of many crops, the
response depended on the __________ under which the crop was grown. -Ans>>stress

Abscisic acid is translocated in the vascular cambium, primarily in the _________. -
Ans>>phloem

, During water stress the pH of xylem sap ______ favoring dissociated ABA. -
Ans>>increases

This result in redistribution of ABA in the leaf and thus increases ABA reaching the
guard cells stimulating closing of the guard cells by potassium ____________. -
Ans>>effux

ABA inhibits ethylene production promoting root growth when the water potential is
____________. -Ans>>low

_________ is the major site of free cytokinin synthesis. -Ans>>root apical meristem

Cytokinins move from through the xylem into the ___________ -Ans>>shoot

Cytokinins induce cell division in callus cells in the presence of _______________. -
Ans>>Auxin

Cytokinins promote ___________ formation leading to organogenesis in tissue culture. -
Ans>>callus

The rate limiting step for ethylene production is ___________ induced by wounding of
the plant. -Ans>>ACC synthase

____________ inhibits ethylene synthesis by blocking ACC oxidase and used to
prevent ripening of fruits in storage. -Ans>>carbon dioxide

These types of fruit produce ethylene and can be stimulated to ripen by ethylene.
_____________ -Ans>>Climacteric

Ethylene can be used to help _________ fruits such as pineapples. -Ans>>ripen

The most predominant auxin that stimulates elongation and promotes cell division is
__________ -Ans>>indoleacetic acid

A synthetic auxin that is used as a herbicide is called _________ -Ans>>2, 4-D

Most auxins are synthesized from _________ by removal of the amino acid group and
terminal carboxyl group. -Ans>>tryptophan

auxins can be synthesized in __________. -Ans>>shoot meristems

Auxins are primarily transported through the __________. -Ans>>phloem

Meristem identify genes -Ans>>flower initiation

floral organ identity genes -Ans>>control formation of floral organs

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