During menstrual cycle, levels of LH and estrogen are highest around
14day
21day
7day
28day
A.
14day
The secretion of gonadotropins (LH and FSH) increases gradually during the follicular phase and stimulates follicular development as well as secretion of estrogens by the growing follicles. Both LH and FSH attain a peak level in the middle of the cycle (about 14 day). Rapid secretion ofLH leading to its maximum level during mid-cyclecalled LH surge induces rupture of Graafian follicle and thereby the release of ovum (ovulation). Concentration of estrogen in blood is also high around 14 day and reaches its peak.
Which of the following occurs due to monosomy of sex chromosome
Down's syndrome
Turner's syndrome
Haemophilia
Sickle cell anaemia
Assertion: Adrenocorticotropic-Releasing Hormones (ARH) excite the anterior lobe of
pituitary gland to produce adrenocorticotropic hormone (ACTH).
Reason: ACTH stimulates the adrenal cortex to secrete its glucocorticoid and mineralocorticoid hormones.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
In cloning of cattle a fertilized egg is taken out of the mother's womb and
in the eight cell stage, cells are separated and cultured untill small embryos are formed which are implanted into the womb of other cows
in the eight cell stage the individual cells are separated under electrical field for further development in culture media
from this upto eight identical twins can be produced
the egg is divided into 4 pairs of cells which are implanted into the womb of other cows.
Which of the following associations shows mutualism
Fig and wasp
Barnacles on whale
Roundworms in human intestine
Orchids on mango tree
Somaclones are prepared by
callus culture
sexual reproduction
micropropagation
somatic hybridisation
Assertion: Pulmonary circulation consists of flow of deoxygenated blood from right ventricle to the lungs and flow of oxygenated blood from lungs to the left atrium.
Reason: Systemic circulation consists of flow of oxygenated blood from the left ventricle to all parts of the body and deoxygenated blood from different parts to right atrium.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.