10th Grade > Biology
CONTROL AND COORDINATION MCQs
Total Questions : 57
| Page 6 of 6 pages
Answer: Option C. ->
Blinking of eyes
:
C
:
C
Blinking of eyes is not a reflex action, but it is involuntary action. A reflex action is one which occurs spontaneously whereas involuntary action happens without the conscious choice of an organism. The way the iris in our eye adjusts the size of the pupil in response to sudden bright or dim light is a reflex action. But blinking of eyes is an involuntary action.
Answer: Option B. ->
cranium
:
B
The bony structure in our head is called the skull. Cranium is the part of the skull that encloses the brain. Three layers of meninges are present below the cranium. Eight bones enclose the brain and form the cranium and fourteen bones form the face. These bones together make up the skull.
:
B
The bony structure in our head is called the skull. Cranium is the part of the skull that encloses the brain. Three layers of meninges are present below the cranium. Eight bones enclose the brain and form the cranium and fourteen bones form the face. These bones together make up the skull.
Answer: Option A. ->
Cytokinin
:
A
:
A
Cytokinins promote cell division, cell growth and differentiation along with auxin. Ethylene is responsible for fruit ripening. Abscisic acid helps the plant to sustain in adverse conditions. Gibberellins enable the plants to grow taller.
Answer: Option A. ->
Cytokinin
:
:
A spinal nerve is a mixed nerve, which carries motor, sensory, and autonomic signals between the spinal cord and the body. In humans there are 31 pairs of spinal nerves, one on each side of the vertebral column.
Answer: Option D. ->
parathyroid
:
D
:
D
The parathyroid glands are small, oval bodies that are usually four in number which lie at the back of thyroid glands. They secrete a hormone called as parathormone or parathyrin. It regulates the level of calcium in the blood plasma. Parathormone and a thyroid hormone called calcitonin work antagonistically (they work in opposite ways i.e. if one increases the calcium and phosphate levels, the other will decrease) to regulate the plasma calcium and phosphate levels.
Answer: Option A. ->
Ethylene
:
A and D
:
A and D
Abscisic acid (ABA) is a plant growth regulator that derived its name because it was initially thought to be responsible for abscission (leaves or fruits falling from the plants). Abscisic acid inhibits growth and so works antagonistically to auxins and gibberellins. Ethylene in excess amount can also play a major for abscission. In leaves, ABA weakens the petiole and results in shedding of the leaves.
Answer: Option B. ->
A - 3, B - 4 , C - 1, D - 2
:
B
:
B
Adrenaline hormone is a crucial part of the body's fight-or-flight response. Adrenaline is produced by the adrenal glands.
When the level of growth hormone is low, the hypothalamus releases growth hormone releasing factor which stimulates the pituitary gland to release growth hormone.
Iodine is necessary for the thyroid gland to make thyroxin hormone.
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