PLS 170C1 FINAL EXAM QUESTIONS WITH ANSWERS ALL CORRECT 2024 NEW UPDATE
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PLS 170C1
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PLS 170C1
PLS 170C1 FINAL EXAM QUESTIONS WITH ANSWERS ALL CORRECT 2024 NEW UPDATE
Which of the following correctly identifies the function of the flower part named? - Answer-Sepals protect the flower bud.
It is estimated that animal or insect-pollinated plants produce 1000 pollen grains for each ovule;...
PLS 170C1 FINAL EXAM QUESTIONS
WITH ANSWERS ALL CORRECT 2024
NEW UPDATE
Which of the following correctly identifies the function of the flower part named? -
Answer-Sepals protect the flower bud.
It is estimated that animal or insect-pollinated plants produce 1000 pollen grains for
each ovule; wind-pollinated plants produce 1,000,000 pollen grains for each ovule.
What does that indicate about pollination systems? - Answer-Wind pollination is less
efficient than animal-assisted pollination.
Cottonwood, aspen, and willow trees have drab-colored flowers, with no petals, that
appear before the tree's leaves are out in the spring; and they are dioecious. What does
that indicate about these trees? - Answer-Their pollen is dispersed by wind.
Large showy flowers are usually wind-pollinated, whereas small inconspicuous flowers
usually attract insect pollinators. - Answer-False
The study of pollen is called palynology. - Answer-True
Most plants are adept at asexual reproduction. What is the probable explanation for the
energy spent for sexual reproduction? - Answer-Sexual reproduction mixes up genes,
contributing to variation in a species.
Angiosperms are unique in having double fertilization that forms endosperm. What is
true about double fertilization in angiosperms? - Answer-One sperm combines with the
egg to form the zygote, and one sperm combines with the polar nuclei to form
endosperm.
The egg of a plant has a haploid chromosome number of 12 (n = 12). What is true about
the number of chromosomes in the cells of other tissues of this plant? - Answer-The
endosperm has 36 chromosomes.
After double fertilization in angiosperms, what development sequence is correct? -
Answer-The ovule becomes the seed.
Which of the following is not part of the mechanism of asexual reproduction in plants? -
Answer-double fertilization
,Homologous chromosomes are the same length, have the same amount of DNA, and
genes for the same characters. - Answer-True
In which phase of meiosis are homologous chromosomes aligned in pairs at the center
of the cell? - Answer-metaphase I
Which of the following is a false statement about homologous chromosomes? - Answer-
They separate from each other during the second division of meiosis.
Which of the following statements pertaining to the alternation of generations in plants is
true? - Answer-The first cell of the gametophyte generation is a spore.
After fertilization, the _____________divides by _______________to produce the
_______________, a miniature plant representing the next generation. - Answer-
zygote; mitosis; embryo
Unripe fruits protect seeds from predation and early germination. What is the major
function of ripe fruits? - Answer-Dispersing seed
Which of the following fruits is classified as a berry? - Answer-all of these
A specialized berry with a tough outer rind that consists of both receptacle tissue and
exocarp is called _____________. - Answer-pepo
What name is given to fleshy fruits that have a single seed in a hard, stony endocarp? -
Answer-drupe
Which of the following is not a dry indehiscent fruit? - Answer-pea
Nuts, grains, and samaras are all types of dry, dehiscent fruits. - Answer-False
Multiple fruits develop from the fused ovaries of many separate flowers. - Answer-True
Which of these developmental events happens first when a seed germinates? - Answer-
The root emerges from the seed to obtain water and nutrients from the soil.
A hypothesis is - Answer-A question that can be tested
The Cell Theory states - Answer-that cells are the basic organizational unit of living
things
How large are plant cells (typically)? - Answer-10-100 micrometers in diameter
Which of the following is found in BOTH animal and plant cells? - Answer-Mitochondria
All psychoactive drugs are illegal and have no medical use? - Answer-False
, Plasmolysis - Answer-the breakage of the cell wall upon dehydration
What is genetic recombination? - Answer-the new combination of maternal and paternal
chromosome segments that result when homologs cross over
Thorns are - Answer-modified leaves
Erosion - Answer-reduces the top soil available for agricultural land
Prokaryotic cells ... - Answer-lack both membrane bound organelles and membrane
bound nuclei.
Stolons are - Answer-horizontal stems modified to facilitate plant distribution
Which of the following is the correct RNA sequence for the DNA sequence
GCCATAAGT? - Answer-CGGUAUUCA
According to the second law of thermodynamics ______________________. - Answer-
the quantity of usable energy declines with each energy transformation
The balanced equation for the generation of sugar from sunlight, water, and CO2 is -
Answer-6 CO2 + 12 H2O → C6H12O6 + 6 O2 + 6 H2O
A farmer uses triazine herbicide to control pigweed in his field. For the first few years,
the triazine works well and almost all the pigweed dies; but after several years, the
farmer sees more and more pigweed. Which of these explanations best describes this
observation? - Answer-Only triazine-resistant weeds survived and reproduced, so each
year more pigweed was triazine-resistant.
Corn was first domesticated in an area of central ________________ at least
_______________ years ago. - Answer-Mexico, 5,500
Genetic variation, provided through sexual reproduction, offers more opportunity for
offspring to survive in changing environments. What two aspects of meiosis provide
sources of such variation? - Answer-crossing over and independent assortment of
chromosomes
Fossilized remains of plants and animals are commonly found in ancient dump sites
referred to as _____________________. - Answer-middens
Cassava is a minor crop of importance only to people in Asia. - Answer-False
Shellfish can accumulate the toxins produced by algal blooms known as "red tide", and
subsequently poison humans who eat the shellfish. - Answer-true
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