STD 12 - 6. evolution — NEET STD 11 Science — Question

How many statements are correct for fertilization?
i. The motile sperms swim rapidly enter into the uterus after insemination and finally reach fallopian tube.
ii. Fertilisation only occurs at the ampullary- isthmic junction.
iii. During fertilisation, a sperm comes in contact with the zona pellucida layer of the ovum and induces changes in the membrane that block the entry of additional sperms.
iv. The secretions of the acrosome help the sperm enter into the cytoplasm of the ovum and induce the completion of the meiotic division of the secondary oocyte.
v. Scientifically it is correct to say that the sex of the body is determined by the father and not by the mother.

Nematocysts take part in

Which one of the following was the contribution of de Vries

Bowman's capsule and glomerulus together constitute

Which one of the following statements are correct ?
(i) ACTH stimulates the synthesis and secretion of steriod hormones called glucocorticoids from adrenal cortex.
(ii) The gonadotrophins release by pituitary gland are LH & FSH.
(iii) Prolactin regulates the growth of mammary gland and formation of milk whereas oxytocin stimulates milk ejection from them.
(iv) Vasopressin is also known as anti-diuretic hormone.
(v) The pineal gland is located on ventral side of forebrain and secretes melatonin hormone.
(vi) The two lobes of thyroid gland are interconnected with a thick flap of connective tissue called isthmus.
(vii) Deficiency of iodine in our diet results in hypothyroidism thyroidism and enlargement of the thyroid gland is called goitre.
(viii) Hyperthyroidism during pregnancy causes defective development and maturation of the growing baby leading to stunted growth called cretinism.
(ix) Hormones of thyroid gland play an important role in the regulation of the basal metabolic rate.
(x) Thyroid glands secretes a steroid hormone called thyrocalcitonin, which regulates the blood calcium levels.
Choose the correct option given below :-

Which one of the following techniques is safest for the detection of cancers?

Ringworm in humans is caused by

At which stage of life the oogenesis process is initiated?

Find the odd example.