Botany Chapter 7

Which of these plants produce leaves with chemicals that affect the behavior and/or mood of people?

All of these answers are correct (marijuana, coca, tea, tobacco)

Which of the following is known to be modified as a tendril?

All of these answers are correct (rachis, leaflet, stipule, petiole)

Which of the following beverages is manufactured or brewed from leaves?

All of these answers are correct (tequila, absinthe, palque, mate)

Floral leaves

Also known as bracts, these specialized leaves are located at the base o flowers or flower stalks and are often mistaken for petals. They can be green or bright colors.

Bladderworts

Aquatic plants with finely dissected leaved and stomach-shaped bladders.\; rush of water propels insect into the trap, trapdoor shuts, and bacteria digest the insect; insect touches 1 of 4 stiff, curled hairs causing a trapdoor to open.

Which statement about venation is incorrect?

Some flowering plants have leaves that lack venation even though the stems and roots have vascular bundles.

Flower pot leaves provide _______. In turn, adventitious roots harvest minerals from the resulting accumulation of nutrient-rich material.

a haven for ant nests

fibers

agave (century plants) species, and sansevierias

Which of the following leaf pigments is/are red if the cell sap is slightly acid and blue if the cell sap is slightly alkaline?

anthocyanins

dyes

bearberry, henna, and blue ash

Because of the greater light intensity and heat absorption on the upper surface of the leaf, the upper surface has

both fewer stomata and a thicker cuticle than the lower surface does

The large cells of certain grass leaves that permit the leaves to roll up under dry conditions are

bulliform cells

The jacket of cells surrounding a leaf vein is usually termed a(n)

bundle sheath

food

cabbage, parsley, lettuce, spinach, and chard

The leaf pigments mostly responsible for gold to orange leaf colors in the fall are

carotenes

Another name for mesophyll cells is

chlorenchyma

Which of the following do guard cells and palisade mesophyll have in common?

chloroplasts

drugs

deadly nightshade, foxglove, cocaine, tobacco, and marijuana

Plants whose leaves fall off at the end of the growing season are

deciduous

Which is a morphological adaptation to reduce water loss from the leaf?

densely hairy leaves

The venation that forks repeatedly in leaves is termed

dichotomous

Leaf venation patterns in ______ leaves are usually netlike or reticulate.

dicot

A leaf arrangement in which there are two leaves at a node is called

opposite

A cluster of leaflets attached to the end of the petiole would be characteristic of a

palmately compound leaf

Window leaves

partially buried, ice cream cone shaped leaves with few stomata and a waxy cuticle. They possess transparent water-storage cells on their exposed surface to allow light to reach their inner chloroplasts.

Which of the following drugs is NOT obtained from leaves?

penicillin

The plant part that facilitates a leaf blade being oriented at right angles to the sun is a(n)

petiole

fragrant oils

petitgrain, orange tree, lavender, patchouli, lemongrass, and citronella

the arrangement of leaves on a stem is referred to as

phyllotaxy

Which of the following insect trapping leaves do NOT have active traps?

pitcher plants

All leaves originate as

primordia

In the abscission zone of the leaf, which of the following is closest to the stem?

protective layer

Which of the following is primarily responsible for forcing water out of hydathodes?

root pressures

In spines most of the normal leaf tissue is replaced with

sclerenchyma

A leaf that lacks a petiole is termed

sessile

Spines

sharply pointed modified leaves or stipules located on the stem. often found on desert plants, they reduce water loss and protect the plant from grazing animals.

A ________ leaf has a single expanse of blade tissue.

simple

Typical leaves function as _______________ in the plant.

solar panels

spices

thyme, marjoram, oregano, tarragon, peppermint, basil, dill, and cilantro

All leaves originate as primordia on the surface of the stem apical meristem.

true

Betacyanins are pigments found in leaves that are usually red in color.

true

Pinnately compound leaves have leaflets in pairs along a rachis

true

Stomata open when the water content of the guard cells increases.

true

Xylem and phloem in a leaf are part of the

veins

Tendrils

very slender, coiled modified leaves that wrap around rigid objects, thereby allowing plants to climb.

The opening and closing of stomata is governed by _______ levels in the guard cells.

water

A leaf arrangement in which there are three or more leaves at a node is called

whorled

Flower-pot leaves

with the help of ants they house, these urn-shaped leaves produce and contain their own growing medium. Adventitious roots will often sprout.

Which if the following is NOT a specialized leaf?

Irish (white) potato

Pitcher Plants

Large, vaselike or cone-shaped leaves with nectar glands to lure in insects; trapped insects cannot climb out due to a wall of downward-pointing, rigid hairs

Sundews

Leaf senses insect, bends to surround it and breaks it down with digestive enzymes; oval leaves with glandular hairs (hairs tipped with droplets of sticky, digestive fluid)

If you are looking for bundle sheath cells in a leaf, you would usually find them forming a layer next to the upper epidermis.

False

Monocots generally have net-veined leaves.

False

Insectivorous plants trap and digest insects and other small organisms to get nitrogen which is lacking in the soils of their environments.

True

Modified leaves are used by insectivorous plants to trap insects. One such plant that has movable modified leaves is

Venus flytraps

Stomata are part of this tissue

epidermis

medicinal oils

eucalyptus, camphor, cajeput, and pennyroyal

which of the following is a function of a stoma?

facilitating transpiration

All healthy leaves of insectivorous plants actively trap insects and other small organisms.

false

Bracts function as little windows that admit light to the interior of the leaf

false

Few, if ant, drugs are obtained from leaves.

false

Most photosynthesis in a leaf take place in the spongy mesophyll

false

Which of the following is a typical characteristic of a shade leaf (as opposed to a leaf of the same plant that is fully exposed to the sun)?

fewer, well-defined mesophyll layers,

bracts are

found at the bases of flowers or flower stalks

The spongy mesophyll is so named because it

has numerous intercellular spaces

In an energy- conscious world, people may plant more trees around their homes because ___________.

leaves of tress provide shade and reduce energy use for cooling homes

Reproductive Leaves

leaves that produce new plantlets along their margins, either at the tips of in notches.

Storage leaves

leaves that store large amounts of either water or carbohydrates for later use. They have large, thin-walled parenchyma cells contain large vacuoles.

Leaves of _________ provide fibers for production of cordage, robes, and other textiles.

manila hemp, a relative of the banana

Leaf veins are located in which of the following?

mesophyll

Venus Flytraps

midrib of leaves forms the hinge connecting the two halves of the leaf blade; blade halves snap shut when an insect triggers 2 of its 3 trigger hairs; trap re-opens after the insect is broken down with the leaf's digestive enzymes.