ch.38 hw

What happens to the two sperm released from a pollen tube during double fertilization?

One sperm fuses with an egg while the other fuses with polar nuclei

Double fertilization in flowering plants results in the formation of two embryos (t/f)

false

Pollen grains release sperm, which then swim to fertilize the egg (t/f)

false

True or false? Fruits provide food to the developing plant

false

True or false? The endosperm tissue that nourishes the developing plant has the same nutritional characteristics regardless of the plant species.

false

What would be the impact of a mutation in a plant that prevents synergids from forming?

fertilization would not occur

Which six of the following statements reflect angiosperm adaptations to life on land?

-Floral parts of the sporophyte protect the reduced female gametophyte from drying out and from UV radiation -In many angiosperms, the male gametophyte contained in a pollen grain can be transported many miles away by wind or animal pollinators -Seeds enable plant embryos to be dispersed long distances from the parent plant via wind or animals -Fruits aid in the dispersal of seeds by wind or by animals that carry or eat the fruits -Seeds protect and nourish plant embryos, and fruits protect the seeds -Flowers attract animal pollinators carrying pollen from other plants of the same species

What is the role of endosperm in the reproductive cycle of flowering plants?

It nourishes embryos as they develop.

Why do fleshy fruits often have seeds with very tough seed coats?

So the seeds can survive the mechanical forces and conditions in an animal's gut

What characterizes the fruit of seeds that are dispersed by the wind?

They have structures to extend the distance they travel on the wind.

A stamen consists of

anther and filament

Which of these is unique to flowering plants?

double fertilization

Which part of a flower develops into the seed?

ovule

Which term describes the portion of a peach that can be eaten by humans?

pericarp

The male gametophytes of flowering plants are also referred to as

pollen grain

In flowering plants the integuments of the ovule develop into a(n)

seed coat

In angiosperms, pollination is the transfer of pollen grain to the _____ of a flower on the same plant or another plant of the same species

stigma

A carpel is composed of

stigma, style, and ovary

Embryos are diploid and endosperm is triploid (t/f)

true

Pollen grains are released from anthers. (t/f)

true