BIOLOGY
12th Edition
ISBN: 9781260169614
Author: Raven
Publisher: RENT MCG
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Textbook Question
Chapter 39, Problem 2A
If you were to plant a de-etiolated (det2) mutant Arabidopsis seed and keep it in a dark box, what would you expect to happen?
a. The seed would germinate normally, but the plant would not become tall and spindly while it sought a light source.
b. The seed would fail to germinate because it would not have light.
c. The seed would germinate, and the plant would become tall and spindly while it sought a light source.
d. The seed would germinate, and the plant would immediately die because it could not make sugar in the dark.
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Scenario:
I planted a monggo seed and put red cellophane over one, and blue cellophane on the other in order to observe the plant growth.
Question:
a. How does the red color affect the seedlings of plants in terms of growth?
b. How does the blue color affects the seedlings of plant in terms of growth?
Suppose that 100 pollen grains land on a stigma, and 50 mature seeds are formed in the fruit. What does this indicate about the pollination process and success?
A) 100% success: 100 pollen grains grew to 50 ovules, two to each, and double fertilization occurred.
B) 100% success: Only 50% of the pollen grains germinated, but each produced 2 sperms to complete double fertilization in 50 seeds.
C) 50% success: 50 sperm fertilized 50 eggs, and 50 sperm fused with 50 polar nuclei.
D) 50% success: 50 sperm fertilized 50 eggs, and 50 sperm fused with 100 polar nuclei.
correct answer and explanation why please.
Under which of the following conditions would pollen from an S2S5 plant successfully pollinate an S1S5 flower?
a. Using pollen from a carpelate flower to fertilize a staminate flower would be successful.
b. If the plants used gametophytic self-incompatibility, half of the pollen would be successful.
c. If the plants used sporophytic self-incompatibility, half of the pollen would be successful.
d. Pollen from an S2S5 plant can never pollinate an S1S5 flower.
Chapter 39 Solutions
BIOLOGY
Ch. 39.1 - Compare the pigments phytochrome and chlorophyll.Ch. 39.1 - List growth responses influenced by phytochrome.Ch. 39.1 - Prob. 3LOCh. 39.2 - Prob. 1LOCh. 39.2 - Prob. 2LOCh. 39.3 - Prob. 1LOCh. 39.3 - Prob. 2LOCh. 39.3 - Prob. 3LOCh. 39.4 - Prob. 1LOCh. 39.4 - Prob. 2LO
Ch. 39.4 - Identify the types of biological molecules that...Ch. 39.5 - Discuss properties of hormones.Ch. 39.5 - Prob. 2LOCh. 39.5 - Prob. 3LOCh. 39 - Prob. 1DACh. 39 - Prob. 1IQCh. 39 - Prob. 2IQCh. 39 - Propose a mechanism to explain how seedlings could...Ch. 39 - Which of the following is stimulated by blue...Ch. 39 - Prob. 2UCh. 39 - Prob. 3UCh. 39 - Prob. 4UCh. 39 - Which of the following does NOT happen as a seed...Ch. 39 - Dwarf mutants can sometimes be induced to grow...Ch. 39 - Prob. 1ACh. 39 - If you were to plant a de-etiolated (det2) mutant...Ch. 39 - Prob. 3ACh. 39 - Which of the following defects would prevent...Ch. 39 - You have come up with a brilliant idea to stretch...Ch. 39 - You have identified a mutant Arabtdopsis plant...Ch. 39 - Which of the following might not be observed in a...Ch. 39 - Prob. 1SCh. 39 - Prob. 2SCh. 39 - The current model for gravitropism suggests that...Ch. 39 - Prob. 4S
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- How would a loss-of-function mutation in the α-amylase gene affect seed germination? a. The seed could not imbibe water. b. The embryo would starve. c. The seed coat would not rupture. d. The seed would germinate prematurely.arrow_forwardA. What is double fertilization? B. What are the products of double fertilization? C. Explain the following quote “As an individual, the endosperm is unique as it has three ancestors and never leaves any descendants.” What are the three ancestors referred to in this quote? And why endosperm does not leave any descendants?arrow_forwardHow would plant development change if the functions of the genes SHOOTMERISTEMLESS (STM) and MONOPTEROUS (MP) were reversed? a. The embryo–suspensor axis would be reversed. b. The embryo–suspensor axis would be duplicated. c. The root–shoot axis would be reversed. d. The root–shoot axis would be duplicated.arrow_forward
- Seed banks function as a reservoir for plant genetics? a. true b. falsearrow_forwardIf the VIN3 gene had a loss-of-function mutation, how do youthink that would affect the phenotypes of summer-annual andwinter-annual Arabidopsis plants?a. Neither type would flower.b. Both types would flower at the proper time.c. The summer type would flower, but the winter type wouldnot.d. The winter type would flower, but the summer type wouldnot.arrow_forwardArabidopsis plants that have mutant AtSUC2 alleles accumulate sugar and starch in their mature leaves. What process might these plants be unable to carry out?. a. Abscission b. Phloem loading c. Guttation d.Photosynthesis.arrow_forward
- Plant biologists are currently working to identify those Arabidopsis genes with unknown functions. If you were assigned to determine the function of a particular gene, how might you approach this task?arrow_forwardMany flowers have both anthers and pistils. What prevents self-pollination and later self-fertilization?arrow_forwardWhat initial observation led the researchers to form a hypothesis? A.) Seeds warmed by sunlight had higher germination rates. B.) Pea plants are more efficient at photosynthesis. C.) Moist paper towels increased germination rates. D.) The germination rate was higher when seeds were directly exposed to sunlight.arrow_forward
- If you exposed seeds to a series of red light versus far-red light treatments, which of the following exposure treatments would result in seed germination? a. Red; far-red b. Far-red; red c. Red; far-red; red; far-red; red; far-red; red; far-red d. Both a and c are correct.arrow_forwardWhat are the external factors on seedling growth? and what are their effects in seed growth and germination? (The seeds used in the experiment are monggo seeds)arrow_forwardWhat is the relationship between pollination and fertilization in flowering plants? Select one: a. Fertilization precedes pollinations. b. If fertilization occurs, pollination would be unnecessary. c. Pollination brings gametophytes together so that fertilization can occur. d. Pollination easily occurs between plants of different species.arrow_forward
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