Glencoe Integrated Science - 7th Grade - OLGC - Chapter 8 Section 2
Terms in this set (51)
____________________________ are any changes in an enviroment that cause organisms to respond.
A plant will respond to __________________ by growing toward it.
When stimulated by an insect's ____________________, the 2 sides of a Venus flytrap snap shut immediately, trapping the insect inside.
light, touch, and gravity
Plants' responses to different environmental stimuli include ___________________________, touch, and _____________________.
A _____________________________________ is a response that results in plant growth toward or away from a stimulus.
The growth of a plant toward or away from light is called __________________.
Leaves and _______________________________ tend to grow in the direction of light.
__________________________ generally grow away from light.
The response of a plant to touch is called _______________________________.
Structures that respond to touch, called __________________, can wrap around or cling to objects.
When ___________________________________, the leaves of Mimosa pudica quickly droop or fold up.
The response of a plant to the stimulus of gravity is called _________________________________________.
_____________________________ grow away from gravity.
______________________________ grow toward gravity.
Some plants flower in response to the amount of __________________________________ they are exposed to.
__________________________________ is a plant's response to the number of hours of darkness in its environment.
Plants that flower when exposed to less than 10-12 hours of darkness are called ________________________________________________ plants.
Any changes in an environment that cause organisms to respond are called ________________________________.
A plant's ______________________________ to stimuli could be slow or rapid, but all plants respond to __________________________.
There are 2 main types of stimuli affecting plants: ___________________________________ stimuli and __________________________stimuli.
A positive ___________________________ identifies a plant's response that results in growth TOWARD a stimulus.
phototropism, gravitropism, thigmotropism
There are 3 types of tropisms: ___________________________,
_______________________________, and _______________________________.
___________________________________ is a plant's response to hours of darkness, and it is a response seen even in some flowering plants.
Carnations are (long-day/ short-day /day-neutral) plants. Choose one.
Roses are (long-day/ short-day /day-neutral) plants. Choose one.
Cehmicals produced by the plant, called ____________________________, are also called messengers because they are produced at one part of the plant anad affect another part.
auxins, cytokinins, gibberellins, ethylene
4 examples of plant hormones
Which plant hormone is a gas given off by plants?
The hormone ___________________________ assists a plant's response to light.
The hormone ______________________ helps ripen fruit.
Plants produce many different hormones. Often 2 or more hormones interact and work together. (True/False.)
Scientists study the interaction of hormones to find ways to make plants more _____________________________.
Larger plants, faster ripening fruit, and stronger and longer ________________________________ are examples of the changes brought about by applying additional hormones to plants.
Short-day plants require 12 or more hours of _________________________________ for flowering to begin.
__________________________________ plants flower when they reach maturity and the environmental conditions are right.
____________________________________ are substances that act as chemical messengers within plants.
Hormones are called ______________________________ because they are usually produced at one part of a plant and affect another part of that plant.
___________________________ generally cause increased plant growth.
___________________________ helps stimulate the ripening of fruit.
________________________________________ increase the rate of cell division and cell elongation in stems and leaves.
________________________________ increase the rate of cell division and slow the aging process of flowers and fruits.
Plants produce many different hormones (True/False.)
Often, 2 or more plant hormones interact and produce a plant response (True/False).
Humans make plants more ___________________________ using plant hormones.
Some crop plants are now easier to _______________________ because humans understand how they respond to hormones.
food, shelter, fuel, oxygen, medicine
Name 4 needs for which humans depend on plants.
long-day plants, short-day plants, day-neutral plants
The 3 types of plants that are affected by photoperiodism
_____________________ are plant hormones that enhances phototropism to make plants grow.
______________________________ helps make fruit ripen.
_______________________ helps plants grow by increasing the rate of cell division and cell elongation.
__________________________ helps increase the rate of cell division and slow aging of plants.