Exam 24: Reproduction and Development of Flowering Plants

The main pollinators of flowers that have markings visible only under ultraviolet light are

Jasmonic acid is a plant hormone that activates a plant's defenses against predators.

Where are floral megaspores located?

In the late 1870s,Charles Darwin and his son Francis discovered that if the tip of the grass was covered,phototropism did not occur,even though the rest of the grass was exposed to light.However,if the rest of the plant was covered and only the tip exposed to light,the grass bent a few centimeters below the tip.Which of the following was sensing the light?

A directional response to touch exhibited by plants is called

The first step in the germination of a plant seed is the absorption of water.

The portion of a flower that receives the pollen is the

A seed's response to gravity is called

The pollen-producing body of a flower is the

Double fertilization reduces the energetic cost of reproduction.In gymnosperms,the female gametophyte stockpiles food for the embryo in advance of fertilization.The investment is wasted if no zygote ever forms.In contrast,double fertilization ensures that an angiosperm devotes energy to the zygote only if sperm fertilizes the egg.Where is this energy stored in a fertilized angiosperm?

Whorl one,the outermost whorl of a flower,is made up of the

A region of separation that forms near the base of the leaf's petiole when the leaf is shed is the

What is a seed?

How are animals involved in the life cycle of plants?

The plant hormone that triggers the withering of petals and stamens and promotes fruit ripening is

The sporophyte generation of a plant is _________________ and produces ___________________ spores.

Abscisic acid is a plant hormone that activates a plant's defenses against predators.

Whorl two of a flower is made up of the

Gymnosperms are the flowering plants.

Cytokinins are plant hormones that stimulate the ripening of fruit.