Biology 9 Lesson 42: Effects of light on living things
1. Theoretical Summary
1.1. Effect of light on plant life
Light has a great influence on the morphology and physiological activities of plants.
+ Because the tree is light-oriented, the trees growing in the forest often have tall, straight trunks, branches and leaves are concentrated only at the top (natural pruning phenomenon) while the trees that grow alone in the light are often low and wide.
+ Depending on the ability to adapt to lighting conditions, plants are divided into 2 groups: light-loving plants and shade-loving plants.
– Some plants like light and dark:
1.2. Effects of light on animals
– Light affects animal life, creating conditions for animals to recognize objects and orient animals in space.
– Light affects the activity, growth and reproduction of animals.
+ There are two basic groups of animals: light-loving animals and dark-loving animals.
– Some animals like light and like darkness
2. Illustrated exercise
Lesson 1: Describe the difference between a light-loving and a shade-loving plant.
The difference between light-loving and shade-loving plants.
Lesson 2: Depending on the adaptability of animals to light, they are divided into two groups of animals:
A. The group of animals that like shade and the group that like the dark
B. The group of animals that like the light and the group that hate the dark
C. The group of animals that like light and the group that like the dark
D. The group of animals that are light and dark
- Depending on the ability of animals to adapt to light, they are divided into two groups of animals: the group of animals that like light and the group of animals that like dark.
3.1. Essay exercises
Question 1: Using the prompts below, explain why the lower branches of trees that live in the forest fall prematurely.
- What is the difference between sunlight hitting the top and bottom branches?
- When leaves are deprived of light, how is the ability of the leaves to photosynthesize?
Verse 2: How does light affect animals?
Question 3: When we put a potted plant next to the window, what happens after a while? Please explain that phenomenon?
Question 4: What is the phenomenon of self-pruning in nature? Please explain that phenomenon?
3.2. Multiple choice exercises
Question 1: Depending on the adaptability of plants to light, plants are divided into two groups:
A. The light group and the shadow group
B. Light-loving group and shadow-loving group
C. The light-loving group and the shadow-loving group
D. Light-loving group and shadow-loving group
Verse 2: The following plant species belong to the group of photophiles:
A. Rice plant
B. Corn plant
C. Castor plant
D. Both A, B and C are correct
Question 3: Which of the following is a shade-loving plant?
B. phoenix tree
C. Tamarind tree
D. Cucumber tree
Question 4: The following activities of green plants are greatly influenced by light:
C. Absorb water
D. All 3 work on
Question 5: Plants suitable for shady environments are:
A. Perennial tree of youth
B. nacre tree
C. casuarina tree
After completing this lesson, you should:
- Students state the effects of light factors on the morphological, anatomical, physiological and behavioral characteristics of organisms.
- List some groups of organisms based on the ecological limit of the light factor.
- Observe things, phenomena, give some examples of the adaptation of organisms to the environment.