Question 1

Bird-pollinated flowers

Accepted Answer

The answer of Bird-pollinated flowers
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Question 2

In angiosperms, double fertilization results in the development of

Accepted Answer

Double fertilization in angiosperms results in the formation of the zygote (which develops into the embryo) and the endosperm. The endosperm provides nutrients for the developing embryo and is a distinguishing feature of angiosperm seeds. Therefore, the correct choice is E.

Question 3

In angiosperms, two male gametes contained within a single male gametophyte participate in fertilization.One sperm nucleus combines with the egg to produce a diploid zygote, and the other sperm nucleus combines with two other haploid nuclei of the female gametophyte.This process is called

Accepted Answer

The process described is double fertilization, where one sperm nucleus fertilizes the egg to form the zygote and the other sperm nucleus combines with two polar nuclei to form a triploid endosperm. None of the other choices accurately describe this process.

Question 4

The flowers of a new kind of tropical vine are bright scarlet in color but are not highly scented.These plants are most likely pollinated by

Accepted Answer

Brightly colored flowers are often pollinated by birds, as they have good color vision and are attracted to brightly colored flowers. The lack of scent also supports the idea that birds are the pollinators, as they rely more on visual cues than on scent to locate flowers.

Question 5

You are throwing a disco-themed party and decorate with some small white flowers that have a delicate fragrance.During the party you notice the flowers have a striking pattern when the black light (a source of UV light) is on.Based on these observations, the flowers are most likely

Accepted Answer

The answer of You are throwing a disco-themed party and...

Question 6

You are given two flowers of the same species from two separate plants.One flower has only a pistil, and the other has only stamens.It is most likely that the flowers are _______ and the species is _______.

Accepted Answer

If one flower has only pistil and the other has only stamens, it means that they are imperfect flowers. If both flowers were from the same plant and had both pistil and stamens, they would be perfect flowers. Thus, the species is imperfect. If the species had both male and female flowers on the same plant, it would be monoecious. However, since the two flowers are from separate plants, it means that the species is dioecious. Therefore, option B is the correct answer.

Question 7

Research on an island off the coast of Australia turns up an angiosperm even more primitive than Amborella.In fact, it employs the most primitive means of transferring pollen, which is pollination by

Accepted Answer

The most primitive means of transferring pollen is by wind. Bees, ants, moths, and songbirds are all relatively advanced pollinators compared to wind pollination. Therefore, the most likely choice is A) wind.

Question 8

When analyzing the fruit from a newly discovered tree, you find a tissue that contains three sets of chromosomes.You are most likely looking at the

Accepted Answer

The endosperm is a tissue in the seeds of most flowering plants that is triploid, meaning it has three sets of chromosomes. This is a result of the double fertilization process, where one sperm cell fertilizes the egg cell to form the diploid embryo, and another sperm cell fertilizes two polar nuclei to form the triploid endosperm.

Question 9

A new kind of lemon tree produces megasporangia and microsporangia in separate flowers on the same plant.This plant has _______ flowers and is _______.

Accepted Answer

The presence of separate megasporangia and microsporangia flowers suggests that the plant is imperfect. The fact that both types of flowers are present on the same plant indicates that it is monoecious, meaning that it has both male and female reproductive structures on the same individual. The plant is not dioecious, as that would mean that separate male and female individuals exist. Finally, a clone would imply that the plant is an exact genetic copy of another individual, which is not suggested in the scenario.

Question 10

Refer to the figure, which shows the life cycle of an angiosperm.  If double fertilization were delayed in this plant, the appearance of which two critical structures shown in the diagram would be also delayed?

Accepted Answer

Double fertilization is the process by which one sperm fertilizes the egg cell to form the zygote (which develops into the embryo) and the other sperm fuses with the polar nuclei to form the endosperm. Delaying double fertilization would delay the formation of both the embryo and the endosperm. Therefore, the appearance of critical structures corresponding to these two would also be delayed. The other structures (integument, micropyle, and pollen tube) are not directly related to double fertilization and would not be affected by its delay.

Question 11

Which scenario described is not possible?

Accepted Answer

A plant that has perfect flowers must have both male and female reproductive parts in the same flower, which is contradictory to being dioecious (meaning the plant has separate male and female individual organisms). The other scenarios are possible.

Question 12

You have discovered a new kind of tree that bears edible fruits.Each fruit consists of carpels of many flowers fused tightly together as one fruit.Based on this arrangement, this fruit would most likely resemble a(n)

Accepted Answer

Pineapples are composed of many fused carpels from multiple flowers, forming a single, large fruit. This is different from raspberries, apples, and grapes, which are typically composed of individual carpels or seeds. Walnuts are also composed of multiple carpels, but they are not generally considered fruit in the same way that pineapples, raspberries, apples, and grapes are.

Question 13

In some of the most basal clades of angiosperms, all of the following are characteristic of flowers except

Accepted Answer

Bilateral symmetry is more characteristic of advanced or derived angiosperms rather than the most basal clades, which typically exhibit radial symmetry and other features listed.

Question 14

A fruit that develops from several separately fused carpels of a single flower, such as a raspberry, is a(n) _______ fruit.

Accepted Answer

An aggregate fruit develops from several separate carpels of a single flower. Raspberries are an example of an aggregate fruit.

Question 15

Plant species in which individuals are exclusively male or exclusively female are called

Accepted Answer

Plant species in which individuals are exclusively male or exclusively female are called dioecious.

Question 16

The diploid zygote in angiosperms develops into the

Accepted Answer

The diploid zygote in angiosperms develops into the embryonic axis and cotyledons. The embryonic axis will eventually form the stem and root system of the plant, while the cotyledons are the first leaves that appear and sometimes serve as a food source for the developing embryo.

Question 17

Strawberries, apples, and pears have parts other than the carpel and seeds and are thus considered to be

Accepted Answer

Strawberries, apples, and pears are considered accessory fruits because they are formed from the receptacle tissue of the flower in addition to the carpel and seeds. In strawberries, the fleshy part is swollen receptacle tissue that holds the achenes (seed-like structures). In apples and pears, the fleshy part is the enlarged and thickened receptacle tissue surrounding the carpels and seeds in the core.

Question 18

You discover a new plant and want to learn more about its biology.Which features will best help you understand which sort of pollination mechanism this plant uses?

Accepted Answer

The morphology and color of the corolla are important features to understand which type of pollinators are attracted to the plant and how the pollination process occurs. For example, if the corolla is brightly colored and tubular in shape, it may be adapted for pollination by hummingbirds or butterflies, whereas if the corolla is pale and wide with a strong odor, it may be adapted for pollination by insects such as bees or flies.

Question 19

Which of the following represents the correct ordering of the events in the angiosperm life cycle?

Accepted Answer

The correct sequence in the angiosperm life cycle starts with a pollen grain reaching the stigma of a sporophyte, followed by the production of a pollen tube that allows the sperm to reach the ovule for fertilization. After fertilization, the diploid zygote is formed and then divides to develop into a new plant.

Question 20

Which of the following about plant-pollinator interactions is false?

Accepted Answer

Flower diversity has not been restricted to accommodate pollinators. Instead, pollinators have played a role in driving the evolution of diverse flower structures and characteristics.

Quiz 28: The Evolution of Seed Plants