STD 12 - 1. sexual reproduction in flowering plants — BIOLOGY STD 12 Science — Question

Statement $I$: Gause's competitive exclusion principle states that two closely related species competing for different resources cannot exist indefinitely.

Statement $II$: According to Gause's principle, during competition, the inferior will be eliminated. This may be true if resources are limiting.

In the light of the above statements, choose the correct answer from the options given below :

$I.$ The property of metastasis is shown by malignant tumors

$II.$ Carcinogens are the agents that causes cancer

$III.$ Benign tumor causes little damage to body cells

Which of the statements given above are correct?

$I$. In the absence of adenosine deaminase enzyme, purine metabolism is disturbed and $T-$lymphocytes fails to function $II$. $ADA$ deficiency is caused by the deletion of the gene for $ADA$

$III$. In some cases, it can be cured by bone marrow transplantation and enzyme replacement therapy. But in both approaches, the patients are not completely cured

$IV$. For permanent cure, genes isolated from the bone marrow cells producing $ADA$ at early embryonic stages can be a possible cure

Which of the above statements are correct?