Unit 7 Study Guide Key

Unit 7 Practice Exam 

1. Plants are most closely related to which species of algae?A. Cyanobacteria (green)

B. Rhodophyta (red)

C. Charophyta

D. Phaeophyta (brown)

E. Chrysophyta (golden)


2. The major force that caused plants to diverge from algae was

A. Plants’ ability to photosynthesize

B. Plants living on land

C. Plants having flowers

D. Plants having roots

E. Plants having seeds


3. Put the types of plants in the correct order of when they evolved, from earliest to latest:

A. Ferns, Bryophytes, Gymnosperms, Angiosperms

B. Bryophytes, Ferns, Angiosperms, Gymnosperms

C. Angiosperms, Gymnosperms, Ferns, Bryophytes

D. Bryophytes, Ferns, Gymnosperms, Angiosperms

E. Ferns, Bryophytes, Angiosperms, Gymnosperms


4. Which of the following is true about the alternation of generations in plants?

A. Sporophytes make gametes by mitosis

B. Gametophytes make spores by mitosis

C. Sporophytes make spores by meiosis

D. Gametes make spores by meiosis

E. Sporophytes make spores by mitosis


5. Which stage(s) of plant life are diploid?

A. Spores

B. Sporophytes

C. Embryos

D. A, B and C

E. B and C 

6. A plant has xylem and phloem, seeds and no flowers.  It is most likely a

A. Moss

B. Fern

C. Gymnosperm

D. Monocot

E. Dicot


7. A friend brings you a new plant.  It has beautiful red flowers, parallel veins and fibrous roots.  It is most likely a

A. Gymnosperm

B. Monocot

C. Dicot

D. B or C

E. A, B or C


8-12 use the following as answers

A. Root cap

B. Zone of elongation

C. Zone of maturation

D. Zone of cell division

E. Lateral meristem

  8. An area of the plant where cells grow to be 10x as long - B  9. The lowest part of the root - A 

10. Place where the plant grows wider - E 

11. Contains root hairs and a functional xylem -C 

12. Area of a root where new cells are forming - D 

13. A gardener often prunes his plants.  This is to

A. Counter apical dominance and make the plant grow taller

B. Counter apical dominance and make the plant grow wider

C. Encourage apical dominance and make the plant grow taller

D. Encourage apical dominance and make the plant grow wider

E. Stimulate the terminal bud


14-17 use the following as answers:

A. Parenchyma

B. Sclerenchyma

C. Collenchyma

D. Tracheids and Vessel elements

E. Sieve-tubes

  14. Dead cells that support the plant -B  15. Cells that support the growing plant -C  16. Cells that transport sugar -E  17. Cells that conduct most metabolic functions -A


18. One major difference between root and leaf anatomy is

A. Only leaves have phloem tissue

B. Root cells have cell walls

C. Leaves have a waxy cuticle

D. Roots have an epidermis

E. Roots have xylem


19.  What type of tissue is found in the center of a root?

A. Dermal

B. Ground

C. Cork

D. Vascular

E. Epidermis


20. Wood is mostly

A. Primary phloem

B. Secondary phloem

C. Primary xylem

D. Secondary xylem

E. Cork


21. Which of the following is least likely to change osmosis in a plant?A. Temperature

B. Difference in solute concentrations

C. Aquaporins

D. Water potential

E. Pressure potential


22. Which of the following is not true regarding the process of active transport?

A. It takes ATP

B. It relies on differences in solute concentration

C. It requires proteins in the membrane

D. It can pump ions against their concentration gradient

E. It can create a membrane potential


23. A plant has a solute potential of -0.3 and a pressure potential of +0.4.  When placed in pure water

A. the plant will gain water

B. the plant will lose water

C. the plant will neither gain nor lose water

D. it will depend on the temperature

E. We need more information about the water


24. AquaporinsA. Move water against its concentration gradient

B. Require ATP

C. Speed up osmosis

D. Change the direction of water flow

E. Are a form of active transport


25. Water can move through the apoplast of plants.  This is significant becauseA. It allows a root to maximize the surface area taking in water

B. It allows water to enter the xylem without passing through a membrane

C. It limits the amount of water that can enter the root

D. The cell wall is more selective than the cell membrane

E. Water can’t move through the cells themselves


26. The endodermis functions to

A. Move all water to the apoplast

B. Push all water straight into the xylem

C. Filter out all minerals so only water makes it to the xylem

D. Direct all water and minerals into the symplast

E. Pump water into the xylem


27. The main force driving movement of water is

A. Root pressure

B. Active transport of water

C. Tension from the build up of sugar

D. Tension from evaporation of water

E. A pump


28. Which of the following does not help increase the surface area of roots for taking in water?

A. Root hairs

B. The Endodermis

C. Mycorrhizae

D. Fungi associated with the roots

E. Fibrous roots


29. Movement of water though the xylem relies on all of the following except

A. Transpiration

B. Adhesion

C. Cohesion

D. Tension

E. Active transport of sugar   

30. Guard cells in the leaf

A. Conduct most of the photosynthesis

B. Control the opening of pores in the leaf

C. Transport water throughout the leaf

D. Transport sugar throughout the leaf

E. Provide a waxy surface to prevent water loss


31. Which of the following would likely cause stomata to open?

A. A very dry day

B. Nighttime in a normal plant

C. The loss of water from guard cells

D. Photosynthesis occurring

E. Dehydration of the plant


32. Which of the following is not true about the xylem?A. It moves both directions

B. The cells are mostly dead

C. The cells contain a thick cell wall

D. There can be many layers, especially in woody plants

E. It transports water and minerals


33. All of the following are true about the movement of sugar except

A. It is conducted by phloem cells

B. It requires active transport

C. It takes place in sieve-tubes

D. It takes place in dead cells

E. Sugar is moved from a source to a sink


34. A chemical inhibits the proton pump and maintenance of a proton gradient.  All of the following would be affected exceptA. Xylem transport

B. Phloem transport

C. Photosynthesis

D. Cellular respiration

E. Stomatal opening


35. CAM plants differ from most plants in that they

A. Don’t photosynthesize

B. Consume animals

C. Open their stomata at night

D. Don’t use carbon dioxide

E. Don’t need nitrogen   

36. Which of the following is not an adaptation to prevent water loss?

A. Thicker leaves with less surface area

B. CAM photosynthesis

C. Losing leaves during the dry seasons

D. Broad leaves

E. Stomata on the lower surface of leaves


37. Which of the following makes the greatest contribution to a plant’s mass?

A. Nitrogen fixing bacteria

B. Carbon dioxide

C. Phosphates in the soil

D. Water

E. Hydrogen ions in the soil


38. Most of a plant’s dry mass is found inA. Carbohydrates

B. Proteins

C. Nucleic acids

D. Fats

E. Lipids


39. A plant is placed in pure clay.  It most likely won’t grow because

A. Clay won’t hold enough water

B. Clay won’t hold enough minerals

C. Clay will hold onto negatively charged minerals too tightly

D. Clay won’t allow any air spaces to hold oxygen

E. Plants grow best in pure clay


40. The significance of humus is thatA. It recycles minerals to the soil

B. It holds lots of air

C. It holds lots of water

D. It helps break down rocks, making more soil

E. It provides energy to the plant


41. Overwatering a plant will kill it by preventing

A. Photosynthesis from occurring

B. Uptake of minerals

C. Formation of water potential

D. Transpiration

E. Respiration in the roots    

42. Bacteria in the soil are essential to life because

A. They hold water for plants

B. They provide the oxygen plants need

C. They make usable nitrogen for all plants and animals

D. They make ATP for plants

E. They are like a natural pesticide


43. A legume is affected by rhizobium.  The most likely effect is

A. Death

B. Dehydration of the plant

C. Yellow leaves

D. More nitrogen in the plant

E. Stunted growth


44. Carnivorous plants have evolved where

A. Sunlight for photosynthesis is scarce

B. Water is scarce

C. Carbon dioxide for photosynthesis is scarce

D. Oxygen is scarce

E. Soil is lacking in minerals 

45. All of the following flower parts are directly involved in pollination exceptA. Sepal

B. Carpel

C. Anther

D. Stigma

E. Style


46. A male flower would not have

A. Sepals

B. Carpels

C. Stamens

D. Anthers

E. Petals


47. Which of the following most accurately describes pollination?

A. Pollen enters the ovule, fertilizing the egg

B. Pollen inserts a tube into the stamen, which inserts sperm into the ovule

C. Pollen binds to the stigma of the carpel and inserts 2 sperm cells through a tube into the ovary

D. Pollen, containing 2 sperm cells, enters the ovary and fertilizes the egg

E. Pollen fuses with the ovary and fertilizes the egg


48. Sperm cells are created via

A. Meiosis in pollen

B. Meiosis in anthers

C. Mitosis in male gametophytes

D. Mitosis in the carpel

E. Meiosis in the stamen

 Pollen is already haploid – thus the sperm cells are made by mitosis so they are also haploid.  Meiosis occurs during the formation of spores (haploid) from sporophytes (diploid) 

49. The purpose of the second fertilization is to

A. Ensure at least one egg gets fertilized

B. Create 2 seeds

C. Make fertilization more efficient

D. Create nourishment for the embryo

E. To create the basal cell


50. Fruits develop from

A. A single ovary

B. Multiple ovaries

C. Multiple flowers

D. A and B only

E. A, B or C 

51. Which of the following is not an advantage of dormancy of seeds?

A. Seeds can germinate after a fire, when there is new space to grow

B. Seeds can germinate immediately after the cold season

C. Seeds can germinate when there is sufficient water

D. Seeds can wait until conditions are ideal for growth

E. All of these are advantages 

52. Which of the following could be an advantage to sexual reproduction in crops?

A. Preservation of good traits

B. Uniform growth periods and fruit sizes

C. Ability to withstand changes to an environment

D. Easier to grow

E. Seeds are better protected than cuttings


53. How do pollination and fertilization relate?

A. Fertilization precedes pollination

B. Pollination brings sperm and egg together to allow fertilization

C. Fertilization creates the gametes which can then pollinate

D. Pollination creates the gametes which can then be fertilized

E. They are the same thing