Coordination — Practice

Question 1

If a person has lost control over emotions, which part of the brain has stopped functioning?

Accepted Answer

Cerebrum

Question 2

Diabetes is related to which gland?

Accepted Answer

Pancreas

Question 3

Leaf movement in Mimosa helps to

Accepted Answer

Protect from grazers

Question 4

The largest region of the brain is ______, a point of contact between two neurons is a ______, ______ is the phytohormone responsible for cell elongation, and thyroxine is responsible for ______.

Accepted Answer

The cerebrum; a synapse; auxin; general growth rate and metabolic activities

Question 5

Which hormone would you use to grow long branches in a dwarf plant, to keep seeds dormant during long storage, and to make several lateral buds sprout after the stem tip is cut off?

Accepted Answer

Gibberellins for stem elongation; abscisic acid for seed dormancy; cytokinins for sprouting of lateral buds.

Question 6

What is a synapse, and how is it useful in the transfer of information?

Accepted Answer

The functional region of contact between two neurons, where the dendrites of one meet the axon of another and information is relayed across a minute gap as a chemical or electrical signal.

Question 7

State whether each of the following is a voluntary action, a reflex action or a conditioned reflex: blinking of eyes, cleaning the table, playing on a keyboard, salivating when food is put into the mouth, closing the ears on hearing an unbearable sound.

Accepted Answer

Blinking, reflex. Cleaning the table, voluntary. Playing on a keyboard, conditioned reflex, learned until it needs no thought. Salivating when food enters the mouth, reflex. Closing the ears, voluntary.

Question 8

How does phototropism occur in plants?

Accepted Answer

Auxin accumulates on the shaded side of the stem, cells there elongate faster than those on the lit side, and the unequal growth bends the shoot towards the light.

Question 9

Arrange in order the events from smelling something foul to covering your nose: chemicals cross the synapse; the impulse reaches gland and muscle cells; the stimulus is received by dendrites and sets off an electrical impulse; the impulse travels through the cell body and axon; the axon end releases chemicals.

Accepted Answer

Dendrites receive the stimulus and an electrical impulse is created; the impulse travels through cell body and axon; at the axon end the electrical impulse releases chemicals; the chemicals cross the synapse to the next neuron, repeatedly; finally the impulse reaches the gland that recognises the smell and the muscle cells that cover the nose.

Question 10

Give an example of coordination in your body where hormonal and nervous controls function together, and explain how each contributes.

Accepted Answer

The fright response. The nervous system detects the threat and acts within a fraction of a second, while adrenalin from the adrenal gland sustains and broadcasts the changes across many organs at once.

Practice — Coordination

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