The function of endosperm is to
a. form the seedling.
b. develop the fruit.
c. provide water to the embryo.
d. provide nutrients to the embryo.
e. provide a protective coating for the embryo.
Parasitic plants have specialized roots for invading a host plant's tissues. What are these roots called?
You are examining a seed with tiny white plumes attached to it. How is this type of seed most likely dispersed?
a. by animals who eat it
b. by floating on water
c. by the wind
d. by attaching to the fur of animals
e. by bursting forth from the seed pod
The pollen grain contains the
Which modern technology is not used in the creation of transgenic plants?
a. protoplast regeneration
b. high voltage electric pulses
c. a gene gun
d. plant hybridization
e. a bacterial plasmid
Which two structures are associated with the terminal bud?
a. apical meristem and leaf primordia
b. shoot tip and zone of maturation
c. apical meristem and zone of cell division
d. zone of cell division and leaf primordia
e. none of these structures are associated with the terminal bud
The two-stage life cycle in plants evolved as an adaptation to life on land.
In asexual reproduction in plants, there is only one parent, instead of two.
The male gametophyte in flowering plants will be found within the
e. pollen grain.
Most of the water obtained by a plant enters through the
a. cambium layer.
b. palisade cells.
c. root hairs.
If you had a problematic hillside that continually eroded when it rained, plants with which type of roots would best solve your problem?
Girdling a tree involves cutting a deep groove all the way around a tree trunk; it would have the effect of
a. triggering additional auxin production and increasing leaf growth.
b. increasing the input of carbon dioxide and increasing photosynthesis.
c. interrupting the flow of minerals and stunting the growth of the tree.
d. interrupting the passage of phloem sap and killing the tree.
e. interrupting the passage of water and killing the tree.
When a plant grows upward, the distance between the internodes increases in length.
Plant vascular tissue contains
a. collenchyma and lignin.
b. xylem and phloem.
c. epidermis and cuticle.
d. periderm and cork.
e. parenchyma and sclerenchyma cells.
Upon visiting a redwood forest, you realize that because of their meristematic tissue these ancient trees are still growing.
Which stem modifications are underground, thin, papery leaves and have a thick stem that lie dormant during the winter?
If digestive enzymes are used to remove the plant cell wall, the naked plant cell that remains is called a
The tissue that regulates entrance of minerals into the vascular cylinder of a root is(are) the
e. root hairs.
Which of the following is not part of the female portion of the flower?
The waxy material known as the Casparian strip is found on the
b. xylem vessels.
c. vascular cambium.
d. endodermal cells.
e. epidermal cells.
Which structure of the eudicot embryo within a seed is NOT correctly identified?
a. The radicle is the embryonic root.
b. A cotyledon is a seed leaf.
c. The endosperm is the nutrient source for the embryo.
d. The epicotyl is the shoot above the attachment of the cotyledons.
e. The hypocotyl is the embryo plant below the attachment of the cotyledons.
Sugars are conducted through plant tissues by the
What flower mechanism would not help prevent pollination by a foreign plant species?
a. A pollen tube only grows inside the style of its own species.
b. The stigma is sticky mainly to its own species of pollen.
c. The timing of flowering keeps pollinators moving among a limited number of species.
d. Flowers attract a small number of specialized pollinators, and therefore pollen is not spread equally to all available species of flowers.
e. Flowers of different plant species bloom at the same time with flowers of similar shape, size, and color.
A friend complains that all of her houseplants have bent stems. You examine the plants and find that their stems all curve toward the light. What would you recommend to your friend to correct the problem?
a. Apply an auxin to the shady side of the stems.
b. Water the plants more frequently.
c. Apply gibberellins to the bases of the stems.
d. Turn each plant occasionally.
e. Repot the plants.
An aphid is an insect that has mouthparts to sip plant sap. When placed on a herbaceous stem, it soon has its mouthparts embedded and is withdrawing plant sap. Sometimes so much plant sap is taken that it cannot use all of it and the aphid secretes droplets of the sugar to attract ants that in turn protect and care for the aphids. What layer of cells has the aphid's mouthparts tapped?