What Is the Right Sequence of Steps During Infection of Plants

question 20

Multiple Choice

What is the right sequence of steps during infection of plants by nitrogen- fixing bacteria?

• A) Rhizobia release Nod factors; roots release flavonoids; rhizobia proliferate inside of root hair; infection thread grows into the root cortex; nodule forms.
• B) Rhizobia release flavonoids; roots release Nod factors; rhizobia proliferate inside of root hair; infection thread grows into the root cortex; nodule forms.
• C) Roots release flavonoids; rhizobia release Nod factors; rhizobia proliferate inside of root hair; nodule forms; infection thread grows into the root cortex.
• D) Roots release Nod factors; rhizobia release flavonoids; rhizobia proliferate inside of root hair; nodule forms; infection thread grows into the root cortex.
• E) Roots release flavonoids; rhizobia release Nod factors; rhizobia proliferate inside of root hair; infection thread grows into the root cortex; nodule forms.

---

Definitions:

Cerebrospinal Fluid

A clear, colorless body fluid found in the brain and spinal cord, playing a key role in cushioning the brain, removing waste, and providing nutrients.

Phagocytes

White blood cells that protect the body by ingesting harmful foreign particles, bacteria, and dead or dying cells.

Bipolar Neurons

are specialized neurons with one axon and one dendrite, commonly found in sensory systems like the retina of the eye.

Dendrite

A branched extension of a neuron that receives impulses from other cells and transmits them to the cell body.