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Chapter 22: Problem 14

Explain how plants grow toward light. Why is this response adaptive?

Short Answer

Expert verified
Plants grow toward light due to phototropism, driven by the hormone auxin. This adaptive response maximizes light absorption for photosynthesis.

Step by step solution

01

- Identify the Phenomenon

Plants exhibit a phenomenon called phototropism, which is the growth of an organism in response to a light stimulus.
02

- Understand Phototropism

In phototropism, plants grow towards a light source. This is typically observed when a plant bends or curves toward light, allowing the leaves to absorb more light for photosynthesis.
03

- Explain the Mechanism

This growth response is due to the plant hormone auxin, which redistributes towards the darker side of the plant, stimulating cell elongation on that side, causing the plant to bend towards the light.
04

- Explore the Adaptive Advantage

The response is adaptive because growing toward the light ensures that the plant can maximize its light absorption for photosynthesis, which is essential for producing the energy required for growth and survival.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Understanding Plant Growth
Plant growth is a fundamental aspect of botany, involving the increase in size and number of cells. It is influenced by various factors, including light, water, nutrients, and temperature.
For instance, light plays a crucial role in directing the growth of plants, as they use it for photosynthesis.
Growth can be measured in terms of height, leaf size, and the development of roots and flowers.
In particular, understanding how plants grow towards light, a phenomenon known as phototropism, is important for optimizing agricultural practices.
Thus, knowing the elements affecting plant growth helps in improving crop yield and ensuring food security.
The Role of Auxin in Phototropism
Auxin is a plant hormone pivotal in regulating growth by affecting the elongation of cells in the plant's stem.
In phototropism, auxin is unevenly distributed in response to light.
When light hits one side of the plant, auxin accumulates on the shaded side.
This higher concentration triggers the elongation of cells on the darker side, causing the plant to bend towards the light.
Understanding this mechanism helps us appreciate how plants adapt to their environment to maximize light exposure, critical for their survival and growth.
Photosynthesis and Its Importance
Photosynthesis is the process by which plants convert light energy into chemical energy in the form of glucose, using water and carbon dioxide.
This process occurs in chloroplasts within the plant cells, enabling plants to create their own food.
Adequate light is necessary for efficient photosynthesis, which explains why plants grow towards light sources.
The glucose produced is used for various functions such as growth, repair, and energy.
Additionally, oxygen, a byproduct of photosynthesis, is essential for the survival of aerobic organisms, including humans.
Adaptive Responses in Plants
Adaptive responses are changes in plants that improve their chances of survival and reproduction in a given environment.
Phototropism is one example of such adaptations.
By growing toward light, plants maximize their ability to absorb sunlight, necessary for photosynthesis.
Other examples include root growth toward water and gravity (known as gravitropism), and variations in leaf size and shape to optimize light capture.
These responses are essential in ensuring plants thrive in diverse environments, contributing to their evolutionary success.

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Most popular questions from this chapter

Give an example of asexual reproduction in a plant.

An oak tree may produce thousands of acorns, which squirrels bury or eat. Why does the tree make so many acorns? Why might a tree whose seeds disperse far from the parent have better reproductive success than one whose seeds fall at the base of the parent plant?

What is double fertilization? How does it increase the reproductive success of the parent plant?

Describe three tropisms. Which hormone is common to all three?

How does seed dormancy promote reproductive success?
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