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STU1043 Introduction to Plant Physiology LU6: Plant Growth Regulators 1 Quiz

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STU1043 Introduction to Plant Physiology LU6: Plant Growth Regulators 1 Quiz

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Questions and Answers

Which of the following is not a plant growth regulator?

Stomata (correct)
Gibberellins
Auxin
Phenolics

What is the role of phytohormones in plants?

Promote photosynthesis
Enhance soil fertility
Facilitate water transport within the plant
Initiate biochemical reactions and changes in chemical composition within the cells (correct)

Which environmental factors interact with phytohormones during growth and differentiation?

Atmospheric pressure and humidity
Wind and rain
Soil pH and nutrient availability
Light and temperature (correct)

Which group of triggering substances is commonly known as phytohormones?

Auxins, Cytokinins, Gibberellins, Phenolics (D) Signup and view all the answers

Which plant growth regulators contain nitrogen?

Auxin and Cytokinin (C) Signup and view all the answers

What are the changes in growth patterns that occur due to phytohormones?

Formation of roots, shoots, leaves, flowers, and other structural characteristics (C) Signup and view all the answers

What is the main function of plant growth regulators (PGR)?

To control the growth and physiological functions of plants (B) Signup and view all the answers

What is a common characteristic of hormones in plants?

They are synthesized by cells in one part of the plant and transported to another part (A) Signup and view all the answers

Which physiological effect is attributed to the role of auxins in plants?

Stimulation of cell division and growth in stem cuttings (B) Signup and view all the answers

What is the specific role of auxin in promoting root initiation?

It stimulates the formation of adventitious roots in cuttings (A) Signup and view all the answers

What happens when a wedge-cut is made in the stem of a Coleus plant to severe and remove parts of the vascular bundles?

New vascular tissues will be formed from the cells in the pith and will connect with the bundles in the uncut regions (A) Signup and view all the answers

What is the main function of auxin related to vascular tissue differentiation?

It influences the differentiation of vascular tissue in the elongating shoot (A) Signup and view all the answers

How does auxin promote the growth of cambium in woody plants?

By promoting cell division in cambium cells under its influence (A) Signup and view all the answers

What is the effect of applying a large quantity of auxin to roots already growing?

It inhibits root growth (D) Signup and view all the answers

What is a characteristic feature related to the use of hormones in plants?

They give rise to different effects from time to time, species to species, and tissues to tissues (D) Signup and view all the answers

What is a key characteristic of plant growth regulators (PGR) known as bio-stimulants or bioinhibitors?

They modify physiological processes in plants to stimulate or inhibit specific enzyme or enzyme systems (D) Signup and view all the answers