Unit 2 Test

Question 0

What causes extremely high levels of toxic chemicals in fish-eating birds?

Answer 0

Biological magnification

Question 1

Which of the following describes carbon dioxide, methane, and water vapor re-reflecting infrared radiation back toward Earth

Answer 1

Greenhouse Effect

Question 2

What is true about secondary consumers in an ecosystem?

Answer 2

They are fewer in number than are primary consumers

Question 3

What’s a fundamental difference between matter and energy?

Answer 3

Matter is cycled through ecosystems; energy isn’t

Question 4

In the nitrogen cycle, the transformation of gaseous nitrogen into nitrogen-containing compounds is performed primarily by

Answer 4

Prokaryotes

Question 5

What best explains why there are seldom more than five tropic levels in a food chain?

Answer 5

Energy is lost from each tropic level

Question 6

What is not a density-dependent factor that could act to limit population growth as population size increases?

Answer 6

Fire

Question 7

Big-bang reproduction like that involving the agave plant is an example of?

Answer 7

Semelparity

Question 8

What causes a sigmodial growth curve (S-shaped) to level off?

Answer 8

The population reaches the environmental carrying capacity

Question 9

When climbing a mountain, we can observe transitions in biological communities that are analogous to the changes

Answer 9

In biomes at different latitudes

Question 10

Which of the following events might you reduction to occur if the tilt of Earth’s axis relative to its plane of orbit was increased beyond 23.5 degrees?

Answer 10

Summers in the US might become warmer, and Winters in Australia might become more severe

Question 11

What would Dr. B want to do if he wanted his green beans to out grow his neighbors’?

Answer 11

Spray gibberellin on them

Question 12

Which plant hormone, developing in an apical bud, either directly or indirectly inhibits the growth of lower axillary buds?

Answer 12

Auxin

Question 13

What statement regarding phototropism is incorrect?

Answer 13

Auxin causes a decrease in growth on the side of the stem exposed to light

Question 14

Transcriptional regulation and post-translational modification are most closely associated with which stage of a signal transduction pathway?

Answer 14

Response

Question 15

What about reproduction in angiosperms is incorrect?

Answer 15

The generative cell undergoes one round of meiosis to form two polar nuclei

Question 16

What types of plant cells are haploid?

Answer 16

Gametophyte main body and gamete

Question 17

How many mitotic divisions are required for conversion of the megastore to the female gametophyte?

Answer 17

Three

Question 18

What is true about plants?

Answer 18

Mitosis occurs in gametophytes to produce gametes, meiosis occurs in sporophytes to produce spores, ms the gametophyte is within the flower on angiosperms

Question 19

Translocation of the phloem sap in a pant is primarily a result of

Answer 19

Positive pressure at the sugar source

Question 20

Under what circumstances will stomata generally be open to allow transpiration to occur?

Answer 20

When guard cells are full of water

Question 21

What effectively describes the Casparian strip?

Answer 21

It ensures that all water and dissolved substances must pass through a cell membrane before entering the stele

Question 22

Which phenomena are involved in the ascent of xylem sap?

Answer 22

Adhesion, cohesion, and transpiration

Question 23

What effect does “pinching back” have on a houseplant?

Answer 23

Makes the plant to grow fuller

Question 24

Which causes an increase in the intensity of UV radiation reaching the Earth?

Answer 24

Depletion of the atmospheric ozone

Question 25

The amount of chemical energy in consumers' food that is converted to their own new biomass during a given time period is known as which of the following?

Answer 25

Secondary production

Question 26

What typifies tropical rainforests?

Answer 26

Great biodiversity and usually highly stratified with at least five distinct layers, or stories, of vegetation

Question 27

The benthic zone of aquatic environments is defined as the

Answer 27

Substrate at the bottom of a body of water

Question 28

Slowing of stem elongation, thickening, and curvature of the stem to start growing horizontally are all part of a growing shoot's response to

Answer 28

Ethylene

Question 29

You are preparing a shipment abroad. To ensure the seeds won't germinate, you treat them with what hormone?

Answer 29

Abscisic acid

Question 30

What isn't a mechanism utilized by plants to prevent self-fertilization?

Answer 30

Brightly colored bracts that replace petals

Question 31

Which of the following cell types are present in the mature pollen grain?

Answer 31

Generative cel and tube cell

Question 32

What is false about bulk flow?

Answer 32

It depends on the force of gravity on a column of water

Question 33

What structure or compartment is not part of the plant's apoplast?

Answer 33

The lumen of a sieve tube

Question 34

Primary growth in plants is produced by the

Answer 34

Apical meristem

Question 35

Vessel elements belong to which plant tissue type?

Answer 35

Vascular

Question 36

The male gametophyte of an angiosperm is

Answer 36

Contained within the pollen grain

Question 37

Where would you expect to find the littoral zone of a lake?

Answer 37

Shallow water area along the shore

Question 38

Based on the ABC model, what would be the structure of a flower that had normal expression of genes C and B, but lacked expression of gene A

Answer 38

Carpel-stamen-stamen-carpel

Question 39

What is the main force by which most of the water within xylem vessels moves toward the top of a tree?

Answer 39

Evaporation of water through stoma

Question 40

What are the five events that explains the mass flow of materials in the phloem?

Answer 40

Leaf cells produce sugar by photosynthesis, sugar is transported from cell to cell in the leaf, diluted are actively transported into sieve tubes, water diffuses into sieve tubes, sugar moves down the stem

Question 41

How many mitotic divisions are required for conversion of the microspore to the male gametophyte?

Answer 41

One

Question 42

Which set of Coleoptera experiments show that auxin is a diffusible molecule?

Answer 42

Experiments that put a slice of mica or slice of agar between the severed tip and the rest of the coleoptile

Question 43

If there are 75 births for a population of 300 individuals, what is the annual per capita birth rate?

Answer 43

.25

Question 44

In the logistic equation, dN/dt =RN, r is a measure of the population's intrinsic rate of increase. It is determined by what?

Answer 44

Birth rate and death rates

Question 45

What is correct about bio geochemical cycling?

Answer 45

The phosphorus cycle is a sedimentary cycle that involves the weathering of rocks