Bio 1260 exam 3 - clicker question
You hammer a nail into a tree trunk 2 meters above the ground. The tree is currently 5 meters tall and grows taller at a rate of 1 meter per year. How far above ground level will the nail be in 10 years? 2 meters 5 meters 15 meters 20 meters
2 meters
Arrange the following events in an order that explains the mass flow of materials in the phloem. 1. Water diffuses from xylem into nearby sieve tubes. 2. Leaf cells produce sugar by photosynthesis. 3. Water diffuses into nearby xylem. 3. Sugar is actively transported into sieve tubes. 4. Sugar is transported into sink tissues. 5. Sugar moves down the stem.
2,4,1,6,5,3
Choose the option that best describes the relationship between the cell wall thickness of parenchyma cells versus sclerenchyma cells. A) The cell walls of parenchyma cells are thinner than those of sclerenchyma cells. B) The cell walls of parenchyma cells are thicker than those of sclerenchyma cells. C) The thickness of the cell walls for both types of cells is roughly equal. D) The thickness of the cell walls for both types of cells is too variable for a comparison to be made.
A
How do ions get across the plasma membrane? A. Active transport B. Passive
A
Which of these situations regarding phloem sources and sinks is FALSE? A.The shoot tip and young leaves are strong sources for the leaves below. B. Sugars can be transported both up and down in plants. C. Storage organs like roots and potato tubers can be sources. D. The seeds in a developing fruit are a strong sink.
A
You place a plant cell in an open beaker of 0.3 M sucrose. The solution has a Ψs of -1.5 MPa. The plant cell has a Ψs of -3.0 MPa and a Ψp of +1.0. Immediately after placing the cell in the sucrose solution, what will happen? A. Water will flow in. B Water will flow out. C. No net water movement. D. The cell will burst.
A
A tree will die if the bark is stripped off around the entire circumference of the tree. Why is this so? A. Water-conducting cells in xylem are removed, and the tree can no longer conduct water and minerals up the trunk to the leaves. B. Phloem cells are removed, sugars can no longer C. be transported from the leaves to the roots, and the roots will die. D. Oxygen is lethal to the inner wood of tree trunks. The apical meristems are removed, preventing any further increase in height
B
Corn plants have male and female flowers on the same plant; cannabis has separate male and female plants. Corn is ____ and cannabis is ___. A. Diecious; monoecious B. Monoecious; diecious C. Imperfect; perfect D. Perfect; imperfect
B
Double fertilization in angiosperms results in: A. a diploid embryo and a diploid endosperm. B. a diploid embryo and a triploid endosperm. C. a triploid embryo and a diploid endosperm. D. a diploid embryo and a haploid endosperm. E. a haploid embryo and a haploid endosperm
B
In roots, the vascular tissue is A. Organized in vascular bundles B. Surrounded by the endodermis C. Found outside of the cortex D.A and B E.All of the above
B
In roots, the vascular tissue is A.Organized in vascular bundles B. Surrounded by the endodermis C. Found outside of the cortex D. A and B E. All of the above
B
Technically speaking, what is wood? A. Primary xylem B. Secondary xylem C. Primary phloem D. Secondary phloem E. Bark
B
Which of the following "vegetables" is botanically a fruit? A) Potato B) Green beans C) Radish D) Celery E) Lettuce
B
Which of these structures represent gametophytes? A. sperm and eggs B. pollen and embryo sacs C. petals and carpels D. ovaries and anthers E. roots, stems, and leaves
B
You hammer a nail into a tree trunk 2 meters above the ground. The tree is currently 5 meters tall and grows taller at a rate of 1 meter per year. How far above ground level will the nail be in 10 years? A. 2 meters B. 5 meters C. 15 meters D.20 meters
B
_______ is the process that drives water transport, in which water moves towards parts of the plant with _______ water potential. A.Transpiration; more positive B. Transpiration; more negative C. Respiration; more positive D. Respiration; more negative
B
How is pressure generated to drive the flow of sugars from leaves to sinks within the plant? A. Sucrose is actively transported out of phloem cells located in the leaves. Water then exits the phloem by osmosis. This causes a decrease in turgor pressure in the phloem cells located in the leaves. B. Phloem cells in leaves contract to generate pressure. This causes sucrose to move down through the rest of the plant. C. Sucrose is actively transported into phloem cells located in the leaves. Water then enters the phloem by osmosis. This causes an increase in turgor pressure in the phloem cells located in the leaves. D. Sugars and water are transported into xylem cells. Turgor pressure increases in xylem, which drives the movement of sugars from the leaves.
C
K+ is an example of a cation nutrient. How is K+ taken up by the root? A. It diffuses into roots down a concentration gradient. B. It is pumped in using primary active transport. C. Secondary active transport via a channel. D. Facilitated diffusion via a channel
C
An ovary contains 20 ovules. How many pollen grains are required for all 20 ovules to develop into viable seeds with embryos and endosperm? A. only 10, since each pollen tube produces two sperm B. 40, since double fertilization requires two pollen to fertilize each embryo sac C. only one, since pollen tubes can release more than one sperm D. 20, since each pollen tube releases two sperm E. only two, since one pollen tube will release sperm and the other will release eggs
D
Rhizobium bacteria are found in the roots of plants such as legumes (e.g., peas and beans). These bacteria: A. help legumes absorb more water from the soil B. help legumes exclude sodium and toxic heavy metals from entering their roots C. help legumes increase the amount of nutrients (e.g., sodium and phosphorous) absorbed from the soil D. form nodules where nitrogen fixation can occur E. are responsible for major diseases, including leaf rot disease in legumes
D
Tree A is 5 meters tall, and tree B is 10 meters tall. Which tree has to expend more energy to move water up the trunk due to cohesion-tension and transpiration? A. Tree A B. Tree B C.Both trees expend the same amount of energy, since energy used in pumping water up the trunk in a tree is constant. D. Both trees expend virtually no energy, since water movement up the trunk of a tree is driven by evaporation of water from leaves.
D
Which of the following is FALSE regarding plant dermal tissue? A) Trichomes can function to deter herbivores and reduce transpiration. B) Guard cells regulate transpiration on the above ground parts of a plant. C) Root hairs increase root surface area to increase water and mineral absorption. D) The cuticle is made of cells that form a layer protecting the epidermis.
D
You place a plant cell in an open beaker of 0.3 M sucrose. The solution has a Ψs of -1.5 MPa. The plant cell has a Ψs of -3.0 MPa and a Ψp of +1.0. You allow the cell to come to equilibrium in the sucrose solution. What will the pressure potential (Ψp) of the cell be after equilibrium? A.-1.5 MPa B. -1 MPa C. +1 MPa D. +1.5 MPa
D
Solute potential A. is one of the factors determining how water moves between cells B. is always negative (except for in pure water) C. becomes more negative as the solute concentration increases D. A and B E. All of the above
E
What important role does the endodermis play in roots? A.The endodermis increases surface area to facilitate the absorption of as much water from the soil as possible. B. The endodermis kills mycorrhizae that try to invade plant roots. C. The endodermis provides the oxygen needed for root growth. D. The endodermis passively transports toxins from the soil into the root cortex. E. The endodermis acts as a selective filter and prevents certain ions and toxins from entering the xylem.
E
Which cell types are alive at maturity? A. Sclerenchyma B. Parenchyma C. Collenchyma D. A and B E. B and C
E
Fertilizer bags are labeled with 3 numbers representing their ratio of N:P:K. N, P, and K are Macronutrients Micronutrients
Macro
How does water move into roots? Active transport Passive diffusion
Passive
Water transport is an active process. True False
false