STD 11 - 16. Excretory product and their elimination — NEET STD 11 Science — Question

Fight­or­flight reactions cause activation of

If the vas deferens of a man is surgically disconnected

Which of the following is absent in frog

What opens in ejaculatory duct of cockroach?

Select correct statements :
(i) Benign tumours normally remain confined to their original location and do not spread to other parts of the body and cause little damage.
(ii) The malignant tumours are a mass of proliferating cells called neoplastic or tumour cells.
(iii) Tumours cells grow very rapidly, invading and damaging the surrounding normal tissues as it starve the normal cells by competing for vital nutrients.
(iv) Metastasis property is found in benign tumours.
(v) lonising radiations like X-rays and gamma rays and non-ionizing radiations like UV cause DNA damage leading to neoplastic transformation.
(vi) Cancer causing viruses called oncogenic viruses have genes called viral oncogenes.
(vii) Antibodies against cancer specific antigens are also used for detection of certain cancers.

Choose the correct statements

Which technique uses the body's water molecules as the bases for its images?

A woman with normal vision, but whose father was colour blind, marries a colour blind man. Suppose that the fourth child of this couple was a boy. Thus boy