STD 11 - 4. Animal kingdom — NEET STD 11 Science — Question

Isthmus : Fallopian tube :: Mammary lobe : ,

It is not an example of Australian marsupials.

Which of the following can’t be taken as the symptom of a female suffering from gonorrhea?

On the basis of nature of nerve fibres, the nerves are

Assertion: Dryopithecus and Ramapithecus were hairy and walked like gorillas and chimpanzees.
Reason: Dryopithecus was more man-like while Ramapithecus was more ape-like.

Mammals have the ability to produce a concentrated urine. Which statement not match with production of concentrated urine ?
(i) The Henle's loop and vasa recta play a significant role in this.
(ii) Concentration of urine occurs by counter current mechanism.
(iii) The proximity between the Henle's loop and vasa recta, as well as the counter current in them increases osmolarity from cortex to medulla.
(iv) Osmolarity increasing from 300 mOsmol L' in the cortex to about 1200 mOsmol L' in the inner medulla.
(v) Osmolarity gradient from cortex to medulla is mainly caused by NaCl and urea.
(vi) Presence of osmolarity gradient helps in an easy passage of water from the collecting tubule thereby concentrating the filtrate (urine).
(vii) Human kidneys can produce urine nearly four times concentrated than the initial filtrate formed.

An 'antigen' is

The recently discovered hormones, melatonin and serotonin are secreted at ends of nerve fibres by the activity of

Bird females have chromosome arrangement as