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Chapter 23: Problem 36

You picked leaves while on a hike. One specimen appears to show an opposite arrangement. On closer inspection, you notice that those are not leaves, but leaflets attached to a midrib vein. What type of leaf arrangement are you observing? a. palmately compound b. pinnately compound c. simple whorled d. simple spiral

Short Answer

Expert verified
b. pinnately compound

Step by step solution

01

- Understand the Terms

First, it's important to understand the botanical terms used in the problem. A 'leaflet' is a smaller leaf-like structure that is part of a compound leaf. In a 'compound leaf', multiple leaflets are attached to a midrib or central vein.
02

- Identify Compound Leaves

Compound leaves can be divided into different types. A 'palmately compound' leaf has leaflets radiating out from a single point at the end of the stalk, like the fingers of a hand. A 'pinnately compound' leaf has leaflets arranged along both sides of a central midrib.
03

- Compare with Observations

According to the question, the observed structure consists of leaflets arranged along a midrib vein. This rules out a 'simple whorled' or 'simple spiral' arrangement, as these involve only single leaves.
04

- Determine the Final Answer

Since the leaflets are attached to a central midrib, the arrangement fits the characteristics of a 'pinnately compound' leaf.

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Key Concepts

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

Compound Leaves
Compound leaves are a fascinating aspect of plant biology. Instead of a single, undivided leaf blade, compound leaves are composed of multiple leaflets.
Unlike simple leaves, compound leaves have a complex structure that includes a central stem called the rachis or midrib.
Each leaflet is attached to this central midrib.

There are two main types of compound leaves we've observed: palmately compound and pinnately compound. Understanding these can help us identify the arrangement of leaflets in different plants.
Compound leaves can sometimes be mistaken for a branch with multiple leaves. However, note that all leaflets in a compound leaf are part of a single system and not individual leaves.
Palmately Compound
Palmately compound leaves have a unique and easily identifiable structure. In this type of compound leaf, the leaflets fan out from a single point at the end of the petiole, much like the fingers on a human hand spreading out from the palm.
Each leaflet is a part of the same compound leaf system.

One well-known example of palmately compound leaves is the horse chestnut tree. You can observe that all the leaflets are attached at a common point, forming a fan-like shape.
This arrangement is quite distinct and can be easily differentiated from other leaf arrangements.
Pinnately Compound
Pinnately compound leaves feature a different arrangement from palmately compound leaves. In this type, the leaflets are arranged along both sides of a central midrib.
Depending on the species, these leaflets can be evenly spaced or paired in an alternating pattern.

A good example is the rose plant.
If you look closely, you'll notice multiple leaflets emerging along the central vein or midrib, giving it a symmetrical appearance.
This arrangement can sometimes resemble a feather, which is why it's termed 'pinnate' (from the Latin word for feather).
Botanical Terms
Understanding some basic botanical terms can significantly enhance your ability to identify and describe plant structures.
Here are a few terms you might encounter:
  • Leaflet: A smaller, leaf-like part of a compound leaf.
  • Petiole: The stalk that attaches a leaf to the plant stem.
  • Midrib: The central vein or main axis of a leaf or leaflet.
  • Rachis: The main spine or midrib in a compound leaf from which leaflets arise.
  • Axil: The angle formed between the upper side of a leaf or stem and the supporting stem or branch.

Familiarizing yourself with these terms can help you in understanding plant morphology better and identifying different leaf arrangements accurately.

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Most popular questions from this chapter

Samples of leaves from monocots and dicots are piled on the table in a laboratory and students are sorting the leaves. What information will help them know which leaves to identify as monocots? a. Bulliform cells are usually absent from monocots whereas they are present on the upper epidermis of dicot leaves. b. Monocots have leaves with parallel venation and dicot leaves have reticulate, net-like venation. c. Dorsiventral symmetry is observed in monocot leaves whereas isobilateral symmetry is observed in dicot leaves. d. Monocots have leaves with reticulate, net-like venation and dicot leaves have parallel venation.

Plants lose water from their aboveground surfaces in the process of transpiration. Most of this water is lost from stomata. Excess loss of water has severe consequences and may be fatal for the plant. The table shows data collected on a sunny day. What is the best explanation for the transpiration rates leveling off and declining at temperature higher than \(27^{\circ} \mathrm{C} ?\) a. The plant ran out of water. b. The plant needs less water as temperature increases, so transpiration slows down to limit water uptake by the roots. c. Stomata close to conserve water, slowing down transpiration. d. The amount of water in the leaves decreases at high temperature and less is available for evaporation.

How do the locations and the functions of the three types of meristematic tissues compare? a. Apical meristems found in the tip of stems and roots promote growth by elongation; lateral meristems found at nodes and bases of leaf blades promote increase in length and intercalary meristems found in the vascular and cork cambia promote increase in girth. b. Apical meristems found at nodes and bases of leaf blades promote growth by elongation; lateral meristems found in the vascular and cork cambia promote increase in girth and intercalary meristems found in the tip of stems and roots promote increase in length. c. Apical meristems found in the tip of stems and roots promote growth by elongation; lateral meristems found in the vascular and cork cambia promote increase in girth and intercalary meristems found at nodes and bases of leaf blades promote increase in length. d. Apical meristems found in the tip of stems and roots promote growth by elongation; lateral meristems found in the vascular and cork cambia promote increase in length and intercalary meristems found at nodes and bases of leaf blades promote increase in length.

Where is the vascular cambium located in an established woody plant? a. between the primary xylem and the primary phloem b. between the secondary xylem and the primary phloem c. between the secondary xylem and the secondary phloem d. between the primary xylem and the secondary phloem

What are the functions of stomata and guard cells, and what would happen to a plant if these cells did not function correctly? a. Guard cells allow carbon dioxide to enter and exit the plant. Stomata regulate the opening and closing of guard cells. If the cells didn鈥檛 function, photosynthesis and transpiration would cease, which would interfere with the necessary continuous flow of water upward from roots to leaves. b. Stomata allow oxygen to enter and exit the plant. Guard cells regulate the opening and closing of stomata. If the cells didn鈥檛 function, photosynthesis would continue but transpiration would cease, which would interfere with the necessary continuous flow of water upward from roots to leaves. c. Guard cells allow carbon dioxide to enter and exit the plant. Stomata regulate the opening and closing of guard cells. Transpiration and in turn, photosynthesis would not occur which is necessary to maintain a continuous flow of water upwards from the roots to the leaves. d. Stomata allow gases to enter and exit the plant. Guard cells regulate the opening and closing of stomata. Photosynthesis and, in turn, transpiration, would not occur which is necessary to maintain a continuous flow of water upwards from the roots to the leaves.
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