Acrosome reaction in sperm is triggered by
capacitation
release of lysin
influx of Ca++
release of fertilizin
C.
influx of Ca++
The activated spermatozoan on reaching the egg plasma membrane, undergoes a number of changes in its acrosomal region. All these changes are collectively described under acrosome reaction. Acrosome reaction is calcium-dependent involving massive uptake of calcium with an efflux of hydrogen generating high pH and osmotic pressure, producing negative surface charge, and partial or total release of the acrosomal enzymes. Calcium influx may activate phospholipase resulting in accumulation of unsaturated fatty acids and fusiogenic lysophospholipids contributing to acrosome reaction.
Assertion: Extra oxygen consumption in human, body is known as oxygen debt.
Reason: The extra oxygen is required by the body to oxidise the accumulated lactic acid produced during strenuous exercise.
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.
Assertion: In a regular medical examination of a small population, a 35 years old lady was found to have higher levels of oestrogens, progesterone in her blood.
Reason : The lady is 12 weeks pregnant.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are hue but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
What do A, B, C and D represent?
A- Infundibulum; B- Fertilization; C- Myometrium; D- Morula
A- Infundibulum; B- Fertilization; C- Endometrium; D- Blastocyst
A- Isthmus; B- Fertilization; C- Myometrium; D- Blastocyst
A- Isthmus; B- Fertilization; C- Endometrium; D- Morula
Assertion : Parturition is induced by neural signal in maternal pituitary.
Reason : At the end of gestation period, the maternal pituitary release prolactin which causes uterine contractions.
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 humans at the end of first meiotic division, the male germ cells differentiate into the
primary spermatocytes
secondary spermatocytes
spermatids
spermatogonia
Which of the following statements is correct
Monkey, apes and humans exhibit estrous cycle.
Urine is pale yellow and slightly alkaline.
Lots of enzymes are present in bile juice.
Ovulation in humans is spontaneous.
Assertion: Now-a-days amniocentesis is banned.
Reason: Amniocentesis gives the information of any abnormality in the foetus and many other complications regarding pregnancy can be detected.
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.
Assertion: Corpus luteum is produced by Graafian follicle after ovulation.
Reason: It secretes estrogen which is necessary to maintain pregnancy.
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.
