Home
Class 12
BIOLOGY
As a tree grows older, which increases r...

As a tree grows older, which increases rapidly in thickness

A

Heart wood

B

Sap wood

C

Pholem elements that serve as entry points for substances for transport to other plant parts.

D

Cortex

Text Solution

AI Generated Solution

The correct Answer is:
To answer the question "As a tree grows older, which increases rapidly in thickness?", we can follow these steps: ### Step-by-Step Solution: 1. **Understand the Components**: Identify the components mentioned in the question: heartwood, sapwood, phloem, and cortex. Each of these has a different role in the tree's structure and function. 2. **Analyze the Phloem**: The phloem is responsible for transporting food (sugars) produced by photosynthesis throughout the plant. However, it does not contribute significantly to the thickness of the tree. Therefore, we can eliminate phloem as an answer. 3. **Examine the Cortex**: The cortex is a layer of unspecialized tissue located between the epidermis and the vascular tissues. While it plays a role in storage and support, it does not contribute significantly to the increase in thickness of the tree. Thus, cortex can also be eliminated. 4. **Differentiate Between Heartwood and Sapwood**: - **Sapwood**: This is the outer layer of the xylem that is actively involved in the conduction of water. It is lighter in color and does contribute to the tree's thickness, but not as significantly as heartwood. - **Heartwood**: This is the inner part of the xylem that is made up of dead cells. It provides structural support and is highly lignified, which means it has a lot of lignin that strengthens the wood. As the tree ages, heartwood forms from the inner layers of sapwood and contributes significantly to the overall thickness of the tree. 5. **Conclusion**: As the tree grows older, the heartwood increases rapidly in thickness due to the accumulation of lignified dead cells and waste materials, which provide mechanical support and contribute to the girth of the tree. ### Final Answer: **Heartwood** is the part that increases rapidly in thickness as a tree grows older. ---
Promotional Banner

Topper's Solved these Questions

  • ANATOMY OF FLOWERING PLANTS

    AAKASH INSTITUTE ENGLISH|Exercise Section D Assertion-Reason Type Questions|10 Videos

  • ANATOMY OF FLOWERING PLANTS

    AAKASH INSTITUTE ENGLISH|Exercise ASSIGNMENT SECTION B Objective Type Questions|35 Videos

  • ANIMAL KINGDOM (CHORDATES)

    AAKASH INSTITUTE ENGLISH|Exercise Assignment (Section-D)|10 Videos

Similar Questions

Explore conceptually related problems

When a tree grows older which of the following increases rapidly?

In a botanical garden of a city there is a huge banyan tree growing on which hundreds of birds and thousands of insects live. Draw the pyramids of numbers and also biomass represented by this community. Comment giving reasons on the two different pyramids drawn.

Assertion : The viscosity of liquid increases rapidly with rise of temperature. Reason : Viscosity of a liquid is the property of the liquid by virtue of which it opposes the relative motion amongst its different layers.

The secretion of gonadotropins increase rapidly during

Assertion: The fundamental frequency of an open organ pipe increases as the temperature is increased. Reason: As the temperature increases, the velocity of sound increases more rapidly than length of the pipe.

Leaf fall occurs in a tree when there is an increase in the concentration of

Statement-1 : The fundamental frequency of an organ pipe increases as the temperature increases Statement-2 : As the temperature increases, the velocity of sound increases more rapidly than length of the pipe.

(A) : The maximum range of coverage by the ground wave propagation is limited up to a few MHz. (R) : The attenuation of ground wave increases very rapidly with frequency.

How does a dicot stem grow in thickness?

Leaf fall occurs in a tree when there is increase in concentration of