NR 215 Plant Biology Lecture 6: Leaves Outline Quiz

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What characteristic makes a leaf different from other green plant parts exposed to the sun?

They lack glucose/starch storage tissues.

They continue to grow like a shoot and produce buds.

They have an epidermis but lack stomata.

They are lateral appendages of a stem specialized for photosynthesis. (correct)

What structures in bald cypress trees are believed to aid gas exchange?

Rachis

Aerenchyma

Phyllotaxy

Pneumatophores (correct)

Which structure of a leaf is responsible for the network of vascular tissue?

Epidermis

Lamina

Petiole

Veins (correct)

Which of the following is NOT a main leaf arrangement category?

Axillary (A) Signup and view all the answers

In compound leaves, how is the blade divided?

Into leaflets (B) Signup and view all the answers

What term is used for leaves that are replaced each year?

Deciduous (A) Signup and view all the answers

What is the term for the extension of the petiole in compound leaf arrangements?

Rachis (B) Signup and view all the answers

Which plant species mentioned in the text is an example of a deciduous gymnosperm?

Bald cypress (D) Signup and view all the answers

What does the lamina refer to in leaf anatomy?

Blade of the leaf (C) Signup and view all the answers

What type of leaves have a single blade per petiole and an axillary bud at the base of each leaf?

Simple leaves (C) Signup and view all the answers

What is the primary function of the epidermis in a leaf?

Protection and regulation of gas exchange (A) Signup and view all the answers

Which leaf arrangement type has the leaflets arranged along the rachis?

Pinnate (B) Signup and view all the answers

What separates the mesophyll from the vascular tissue in Gymnosperm leaves?

Endodermis (C) Signup and view all the answers

What is the role of the endodermis in Gymnosperm needles?

Separates ice-containing central tissue from ice-free mesophyll (D) Signup and view all the answers

How does the endodermis impact needle freezing behavior in conifer leaves?

It helps manage ice localization (D) Signup and view all the answers

What is the significance of the endodermis in mountain pine needles during freezing?

Determines frost resistance (B) Signup and view all the answers

Which cellular structure is separated by the endodermis in Gymnosperm leaves?

Mesophyll (A) Signup and view all the answers

How does the presence of an endodermis impact ice management in conifer needles?

Facilitates discrimination between ice-containing and ice-free tissues (B) Signup and view all the answers

What is the main function of stomata on a leaf?

Regulate gas exchange (A) Signup and view all the answers

What is the specialized function of guard cells on a leaf?

Regulate stomatal opening and closing (C) Signup and view all the answers

What happens to up to 99% of water absorbed by a plant?

Is 'lost' through transpiration (D) Signup and view all the answers

What theory explains the movement of water from roots to leaves in plants?

Cohesion-Tension Theory (C) Signup and view all the answers

Besides gas exchange regulation, what other role does transpiration play in plants?

Cools plants and facilitates nutrient transport (A) Signup and view all the answers

What is the primary function of stomata during photosynthesis?

Allow entry of CO2 and release of O2 (C) Signup and view all the answers

What was the consequence of ice confinement to the central vascular cylinder in frozen needles?

Mesophyll cells remained photosynthetically active. (A) Signup and view all the answers

How does the specific lignification patterning of cell walls help in mountain pine needles?

It impedes freeze-dehydration and enables gas exchange of frozen needles. (D) Signup and view all the answers

What is the role of the hypodermis in gymnosperm leaves?

It is a layer of sclerenchyma cells beneath the epidermis that supports leaves. (B) Signup and view all the answers

How does the lignification of endodermal cell walls affect freezing response?

It contributes to ice confinement in the central vascular cylinder. (C) Signup and view all the answers

What is the primary function of the microchemistry of cell walls investigated by Raman microscopy?

To relate the freezing response to the structure of cell walls. (A) Signup and view all the answers

Why is the elaborate needle freezing pattern at the treeline considered ecologically important?

It enables gas exchange in frozen needles, crucial in freezing environments. (D) Signup and view all the answers