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Why is the cohesion of water important for biological systems? A) It helps to moderate the temperature of cold-blooded animals. B) It prevents chemical reactions from occurring in body systems. C) It helps transport water from the roots to the leaves of a plant. D) It prevents salts from dissolving inside the plasma membrane.

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Keith Leannon
Keith LeannonLv2
29 Sep 2019
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Related questions

1,Match the descriptions to the type of transport.

- A. B. C.

Water enters a cell because it is hypertonic compared to the extracellular environment, increasing its turgor pressure
- A. B. C.

Water enters guard cells because the guard cells are hypertonic compared to the surrounding cells
- A. B. C.

Potassium ions are pumped into guard cells
- A. B. C.

The motor cells of a Venus fly trap are hypotonic compared to surrounding cells, causing water to leave the motor cells
- A. B. C.

Sugar is loaded into the phloem
A.

Both active and passive transport
B.

Passive Transport
C.

Active transport

2,Describe what is wrong with the following statement and explain why:

All prokaryotic and eukaryotic cells contain plasma membrane, nucleus, ribosomes, organelles, cytoplasm, and cell walls.

What is short-distance transport?

a,

The movement of solutes from a region of low concentration to a region of high concentration

b,The movement of water, nutrients, and other substances between cells
c,

The movement of substances from a region of high concentration to a region of low concentration
d,

The movement of water across a semipermeable membrane from a region of low solute concentration to a region of high solute concentration.

What terms describe the movement of water across a semipermeable membrane from a region of high water concentration towards a region of low water concentration (and high solute concentration.)

What is found in the proptoplasm?

Cell wall, cytoplasm, plasma membrane, nucleus, and other cell organelles

Plasmodesmata, cell wall, and plasma membrane

Cell wall, cytoplasm, and plasma membrane

Cytoplasm, nucleus, and other cell organelles

The channels that allow nutrients and protoplasm to pass between plant cells are called _________________.

What happens when a plant cell is placed in a hypotonic solution?

Water will enter the plant cell and the plasma membrane will swell and cell lysis will occur

Water will leave the plant cell and the plasma membrane will pull away from the cell and plasmolysis will occur

Water will enter the plant cell and the plasma membrane will swell and push against the cell wall

Water will leave the plant cell and the plant cell will lose turgor pressure, causing the plant to wilt

________________ transport uses cellular energy.

What molecules make plasma cell membranes hydrophilic on the outside and hydrophobic on the inside?

What type of cells do plants have?

Bacterial

Archaeic

Eukaryotic

Prokaryotic

Question 1

Plasma membranes are selectively permeable. This means that

A.

glucose cannot enter the cell.

B.

the plasma membrane allows some substances to enter or leave a cell more easily than others.

C.

plasma membranes must be very thick.

Question 2

Oxygen molecules O2 crosse a plasma membrane by

A.

passive transport

B.

osmosis

C.

active transport

Question 3

Facilitated diffusion across a biological membrane requires ________ and moves a substance ________ its concentration gradient.

A. energy and channel proteins; against (up)

B. transport proteins that make channels ; down

C. energy ; down

Question 4

When two aqueous solutions that differ in solute concentration are placed on either side of a semipermeable membrane and osmosis is allowed to take place, the water will

A. move to the side with lower water concentration

B.

move to the side with higher water concentration

C.

move to the side with lower solute concentration

Question 5

Kinetic energy differs from chemical energy in that

A.

chemical energy is a particular form of kinetic energy.

B.

kinetic energy is the energy of a moving object, whereas chemical energy is the potential energy of molecules.

C.

kinetic energy is stored energy that has the potential to do work, and chemical energy is the energy of movement.

Question 6

When a cell uses chemical energy to perform work, it uses the energy released from a(n) ________ reaction to drive a(n) ________ reaction.

A.

exergonic; endergonic

B.

endergonic; exergonic

C.

spontaneous; exergonic

Question 7

When an enzyme catalyzes a reaction

A. it raises the activation energy of the reaction.

B. it lowers the activation energy of the reaction.

C. it is used once and discarded.

Question 8

Which of the following statements regarding enzyme function is false?

A. An enzyme's function depends on its three-dimensional shape.

B. Enzymes are very specific for their substrates.

C. Enzymes are used up when they catalyze a chemical reaction so must be synthesized for each new chemical reaction

1. Select the true statements concerning tracheids.

Tracheids are responsible foranchoring the plant to a substrate.
Pterophytes lack tracheids but haveeuphylls.
Without tracheids colonization ofland would not have been possible.
All of the large dominant extantland plants are tracheophytes.
Tracheids allow for efficienttransport of water over longer distances.

2. Plants lacking well-developed conducting systems such asmosses, liverworts, and hornworts have been called

sporophytes.
bryophytes.
gymnosperms.
gametophytes.

angiosperms.

3.Select the true statements concerning gametophytes andsporophytes.

Both produce gametes.
Sporophytes are alwaysnutritionally dependent on the gametophytes.
Across all plant speciesgametophytes tend to remain small.
Only sporophytes produce eggs.

Antheridia are located on the gametophyte.

4. A waxy cuticle helps prevents desiccation. What is the costof this adaptation?

Slower H2Otransport
Reduced gas permeability
Lowered light absorption
Increased exposure to damaging UVradiation

Increased susceptibility to pathogenic infection

5.Select the best answer to complete the following statement.Stomata are openings used by plants for the passage of

carbon dioxide, oxygen, and watervapor.
only carbon dioxide and spores orgametes.
only carbon dioxide and watervapor.
only carbon dioxide andpollen.

only oxygen and carbon dioxide.

6.One of the main distinctions between charophytes and landplants is the possession of a cuticle. Why do modern charophyteslack a cuticle?

Their tough seed coats negate theneed for a cuticle.
Cuticles aren't necessary whenliving in water.
Modern Charophytes make up for theabsence of a cuticle by have large numbers of stomata.

Charophytes have a haplodiplontic life cycle.

7.Select the following plant adaptations for the terrestrialenvironment that are correctly listed by their function.

Stomata allow for gas exchangebetween the plant and the atmosphere.
Tracheids protect againstdesiccation.
Stomata transport water aroundplant body.

Tracheids transport water and minerals around the plantbody.

8.What would be the simplest way for a non-botanist to confirmthat the fern is not a small palm?

Height, all ferns are verysmall
Lack of roots, palms have roots butferns do not
Leaf shape, only ferns havedissected leaves

Dots on the underside of the leaf, only ferns have sporangiaunder their fronds

9.Select the true statements relating to the colonization ofland by plants.

Desiccation is a much more commonproblem in terrestrial environments.
Cuticle layers reduce gasexchange.
Xylem tissue, seeds and stomata arefound on both plants and charophytes.

Without trachids land plant would not have been to able to growmore than just a meter or so tall.

10.Survival on land for organisms is difficult because of theproblem of

spore germination.
coevolution.
desiccation.
pollination.

syngamy.

11. Well-developed vascular systems are absent in all of thefollowing except

mosses.
Charophytes.
hornworts.
liverworts.

Pterophytes.

12. Bryophytes, like ferns and certain other tracheophyteplants, require

soil to reproduce sexually.
water to reproduce sexually.
sunlight to reproducesexually.
air to reproduce sexually.

shade to reproduce sexually.

13.Plant success on the terrestrial landscape is linked to theevolution of all of the following except

gas-filled air spaces.
stems.
specialized reproductivefeatures.
specialized roots.
increased area for photosynthesisin the leaves.

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