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

Select the correct statement for supar class pisces
a. In chondrichthyes claspers are present in male
b. Air bladder regulates buoyancy in osteichtyes
c. Heart is usually two chambered but three chambered in frog
d. Members of pisces are called true fish

Bundle of His' can be named as a muscular tissue which is found between

Identify the wrong statements for poriferans from given statements.
(i) Metameric segmentation present in poriferans
(ii) Notochord is a mesodermally derived in poriferans.
(iii) Poriferans are primitive multicellular and have cellular level of organisation.
(iv) Digestion is intracellular in poriferans
(v) Poriferans are hermaphrodite and fertilisation is internal.

In most mammals, the testes are located in scrotal sac for

Conversion of milk to curd improves its nutritional value by increasing the amount of

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.

Which is not possible by mutation:

Radial symmetry occurs in