Biology 1B - Lesson Two

A food-rich tissue that nourishes the seedling as it grows is called the _____.

Endosperm

Seed _____ is the early growth stage of the plant embryo.

Germination

In _____, stems are used as scions.

Grafting

Hormone

Substance produced in one part of an organism that affects another part of the organism.

Lateral Bud

A meristematic area on the side of a stem that gives rise to side branches.

In angiosperms, pollen grains are produced within the _____.

Anther

When buds are used as scions, the process is called _____.

Budding

Herbicide

Compound that is toxic to plants.

During _____, plant embyros are alive but not growing.

Dormancy

In _____, plant growth and activity decreases or stops.

Dormancy

The process of _____ in angiosperms produces a diploid zygote and a triploid endosperm.

Double Fertilization

The female gametophyte of the flowering plant consisting of eight nuclei and the surrounding membrane is called the _____.

Embryo Sac

Short-Day Plants

Flower when days are short.

Apical Dominance

Inhibition of a lateral bud growth near stem tips.

Brightly colored _____ attract pollinators to flowers.

Petals

Gibberellins

Plant hormones that increase the overall size of plants.

Auxins

Plant hormones that stimulate cell elongation.

Phytochrome

Plant pigment that responds to periods of light and darkness.

Epiphytes

Plants that are not rooted in soil and grow directly on other plants.

In gymnosperms, pollen grains form in _____.

Pollen Cones

When a pollen grain lands on a stigma, it begins to grow a (an) _____.

Pollen Tube

Phototropism

Response of a plant to light.

Photoperiodism

Response of a plant to periods of light and darkness.

Gravitropism

Response of a plant to the force of gravity.

Thigmotropism

Response of a plant to touch.

The female gametophyte is produced by _____ in gymnosperms.

Seed Cones

The sticky portion of the carpel where pollen grains often land is called the _____.

Stigma

Strawberry plants send out long trailing stems called _____ that produce roots when they touch the ground.

Stolons

Tropisms

The responses of plants to external stimuli.

When flowering plants reproduce asexually it is called _____.

Vegetative Reproduction