AP Biology : Plant Biology

Study concepts, example questions & explanations for AP Biology

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Example Questions

Example Question #11 : Plant Biology

Which of the following best describes the pith: a tissue type present in vascular plants?

Possible Answers:

It is a tissue in non-vascular plants that transports nutrients throughout the plant

Pith is located in leaves

It is a tissue in vascular plants that transports nutrients throughout the plant

It contains no parenchyma cells

Correct answer:

It is a tissue in vascular plants that transports nutrients throughout the plant

Explanation:

Pith is a type of tissue located in the stems of vascular plants. It stores and transports nutrients throughout the plant. The pith is composed of parenchyma cells.

Example Question #1 : Understanding Angiosperms

What is the female reproductive structure in angiosperms?

Possible Answers:

Pistil

Integument

Stamen

Pollen

Petal

Correct answer:

Pistil

Explanation:

Angiosperms are flowering plants. They have both male and female reproductive organs.

The pistil is the female reproductive structure, and consists of three parts. The stigma is the sticky knob used to catch pollen. It is situated at the top of the style, while the ovary contains egg cells and is located below the style. 

The stamen is the male reproductive structure, and consists of two parts. The anther produces pollen, and the filament helps in holding up the anther.

Example Question #2 : Understanding Angiosperms

Which of the following is a quality that distinguishes angiosperms from other plants?

Possible Answers:

Angiosperms are able to survive in aquatic environments

Angiosperms have true roots

Angiosperms have true flowers

Angiosperms are able to reproduce vegetatively

Angiosperms produce spores

Correct answer:

Angiosperms have true flowers

Explanation:

The production of a true flower is one of the defining characteristics of an angiosperm. In fact, angiosperms are also called "flowering plants." Groups of plants that are not angiosperms (think ferns, ginkgos, or pine trees) can have roots and spores and are able to survive in aquatic environments and reproduce vegetative.

Example Question #1 : Understanding Angiosperms

Which of the following is not a difference between monocots and dicots?

Possible Answers:

Dicots can have secondary (radial, horizontal) growth whereas monocots cannot

Monocot embryos have one cotyledon where dicot embryos' have two cotyledons

Dicots have a true flower whereas monocots do not

The vascular bundle tissue of monocots is arranged in a ring whereas in dicots the vascular bundle tissue has no particular pattern

Monocot veins are parallel whereas dicot veins are branched

Correct answer:

Dicots have a true flower whereas monocots do not

Explanation:

Both monocots and dicots are angiosperms which means that they both have true flowers. All of the other answer choices are true differences between monocots and dicots.

Example Question #12 : Plant Biology

Which of the following traits are specific to angiosperms?

Possible Answers:

Endosperm

All of these

Flowers

Fruit production

Correct answer:

All of these

Explanation:

Angiosperms are a class of land plant that produces seeds. Angiosperms can be distinguished from gymnosperms by characteristics that include flowers, the presence of endosperm, and fruit production.

Example Question #13 : Plant Biology

Which of the following is true regarding seed development in angiosperms?

Possible Answers:

Seeds are enclosed within the ovary

They often exist in cone form

Seeds are "naked" and not enclosed in an ovary

Seeds develop on leaves or scales

Correct answer:

Seeds are enclosed within the ovary

Explanation:

Angiosperm seeds are enclosed within ovaries, which prevent self-fertilization and allow for selective pollination.

Example Question #6 : Understanding Angiosperms

Which of the following is not a trait of angiosperms?

Possible Answers:

Flowering organs

Endosperm

Reduced gametophyte stage

Unenclosed seeds 

Correct answer:

Unenclosed seeds 

Explanation:

Angiosperms have certain characteristics that distinguish them from gymnosperms including flowering organs, endosperm, and a reduced gametophyte stage. Additionally, angiosperms possess closed seeds that are surrounded by the ovary.

Example Question #3 : Understanding Plant Metabolism And Photosynthesis

Which of the following structures is unique to plant cells?

Possible Answers:

Vacuoles

Endoplasmic reticulum

Mitchondria

Lysosomes

Chloroplasts

Correct answer:

Chloroplasts

Explanation:

Chloroplasts are organelles in plant cells that conduct photosynthesis; therefore they are unique to plant cells. All the other mentioned organelles can be found in both animal and plant cells.

Example Question #1 : Plant Structures

Which of the following can be found in plant cells, but not animal cells?

Possible Answers:

Ribosomes

Cell membrane

Mitochondria

Chloroplasts

Correct answer:

Chloroplasts

Explanation:

Chloroplasts, the site of photosynthesis, are only in plant cells and are not found in animal cells. Ribosomes, a cell membrane, and a mitochondria, however, can be found in both animal and plant cells.

The other structure that may be found in plant cells, but not animal cells, is a cell wall.

Example Question #5 : Understanding Plant Metabolism And Photosynthesis

Where in the chloroplasts does the Calvin Cycle of photosynthesis take place?

Possible Answers:

Intermembrane space

Thylakoid lumen

Grana

Stroma

Thylakoid membrane

Correct answer:

Stroma

Explanation:

The Calvin Cycle occurs in the stroma, the aqueous fluid-filled area of the chloroplast. The stroma can be seen as analogous to the cytoplasm of a cell, in that it is the liquid in which all other substructures reside. The other processes of photosynthesis, the light-dependent reactions, take place in the thylakoid, a membrane-bound substructure within the chloroplast.

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