bio quiz plants

Which of the following is a correct description of guard cell activity with regard to stoma?

When the guard cells become flaccid from losing water, the stoma opens

20. Leaves are adapted for photosynthesis in a plant's environment. Cacti leaves are the sharp spines that protect them and reduce water loss. This is known as a leaf's

adaptation

which of the following is not one of the main funtions of roots?

carrying out reproduction

A pollen grain, having absorbed water, sprouts a tube that extends down into the ovary. What is the name of this particular process?

fertilization

which is the most common type of plant tissue?

ground tissue

The palisade mesophyll and the spongy mesophyll are parenchyma cells in the inner leaf that are specialized for what natural process?

photosynthesis

How sap moves through a plant from a sugar source to a sugar sink is called

pressure-flow model

Which is the end product of glycolysis and a requirement for the Krebs cycle?

pyruvate

which part of a seed embryo becomes a root?

radicle

Which of the following is the most important environmental cue in changing a seed from being dormant to active growth?

temperature

xylem and phloem combine to which of the following?

vascular tissue/bundles

_______is a vascular tissue that carries water and _______is a vascular tissue that carries sugars produced by photosynthesis from the leaves to the rest of the plant.

xylem, phloem

Plants cells differentiate into cell types such as parenchyma or epidermis in which area of the root?

zone of cell division

Most of the growth in shoots and root tips occurs in which area?

zone of elongation

Which of the following is the best description of the electron transport chain?

A chain of molecules that move down a concentration gradient from the matrix of the inner membrane of the mitochondria

The Casparian strip performs what function in the root?

Forms a watertight barrier around endodermal cells

What are chlorophylls and carotenoids?

Photosynthetic pigments in the leaf that absorb light energy

Which of the following best explains how the surface of the leaf is used in a plant's natural processes?

Photosynthetic processes exchange gases through the leaf's surface.