12th Class Biology MCQS Chromosomes And DNA

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The addrenaline cortex produces ______________
Adrenaline
Aldosterone
Calcitonin
Epinephrine

Oxytocin is secreted by the endocrine gland named:
Parathyroid gland
Adrenal gland
Pituitary gland
Thyroid gland

_______ regulates the kidney’s retention of water.
Oxytocin
Vasopressin (ADN)
Prolactin
Thyroxin

In chordates the healing of fracture and repair of a skin wound are some other examples of
Reformation
Regeneration
Renaissance
Rejuvenation

Clear cytoplasm produces
Gut
Larval epidermis
Neural tube
Muscle cells 

The negative physiological changes in our body are said to be
Childhood
Agning
Displacement
Maturation

A plant has a growth pattern called
Closed growth
Previous
Round growth
Open growth

During elongation the cell volume increase up to 150 fold due to uptake of
Water
Light
Oxygen
Carbon dioxide

In humans ,MSH(melanocyte-stimulating hormone) ___________
Governs the rate of tarming
Causes the thyroid to produce thyroxin
Concentration is very low.
Regulates primary skin color

Parathyroid hormone acts to ensure that
Sodium levels in urine are constant
The concentration of water in the blood is sufficient
Potassium levels in the blood do not escalate
Calcium levels in the blood never drop too low

In the chick the mesodermal cells migrate and caudally from both sides and create a mid line thickening called
Blastoderm
Primitive streak
Excretion
Ultra-streak

Which prosess is characterized by movement and rearrangement of cells in the embryo
Blastulation
None of these
Gastrulation
Neurulation

The functions of oxytocin islare to ___________
All of the above
Induce labor
Cause the uterus to contract
Stimulate the release of milk from the mother’s mammary glands when her baby is nursing

Which of the following hormones is not released by the anterior pituitary?
Melanocyte – releasing hormone
Gonadotropin-releasing harmone
Thyroid- stimulating hormone
Growth hormone

An ordered sequence of irrversible steps with each step setting up the necessary conditions for the next step is
None of these
Growth
Development
Embryology

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