STD 11 - 19. Chemical coordination and integration — NEET STD 11 Science — Question

Which one of the following organisms bears hollow and pneumatic long bones?

Given below are two statements:
Statements-I: Amphibians and mostly reptiles have a 3-chambered heart with two atria and a single ventricle, and oviparous in nature
Statements-II: Crocodiles possess a 4 chambered heart with two ventricles and two atria: and viviparous in nature
In the light of the above statements, choose the most appropriate answer from the options given below:

In Mendel's experiment nature of seed coat, flower colour, position of flower, pod colour, stem height etc. are reffered to as

Entamoeba histolytica infection occurs through

Statement I: Heart failure is when the heart muscle is suddenly damaged by an inadequate blood supply.
Statement II: Atherosclerosis is caused by deposition of calcium, fat, cholesterol and fibrous tissue.

Which of the following gland grows to the maximum size at puberty and then diminishes gradually?

Which of the following sequences is correct to initiate inspiration ?
(i) The contraction of external intercostals muscles raises the ribs and sternum.
(ii) Volume of thorax increases in the dorso-ventral axis.
(iii) Intrapulmonary pressure decreases.
(iv) Diaphragm contraction.
(v) Air rushes into lungs.

Assertion : Corpus luteum degenerates in the absence of fertilization.

Reason : Progesterone level decreases.

Ganga Action Plan for controlling pollution in Ganges started in