NEET 2012 Biology question

Which one of the following is the correct statement for respiration in humans ?

(1)About 90% of carbon dioxide () is carried by haemoglobin as carbamino-haemoglobin
(2)Cigarette smoking may lead to inflammation of bronchi
(3)Neural signals from pneumotaxic centre in pons region of brain can increase the duration of inspiration
(4)Workers in grinding and stone-breaking industries may suffer from lung fibrosisCorrect

Answer: (4)

Solution

Occupational respiratory disorders: long-term exposure of workers in grinding or stone-breaking industries to silica dust causes inflammation leading to fibrosis (proliferation of fibrous tissue) and serious lung damage (silicosis). So (4) is correct according to NCERT. (1) is wrong: about 20-25% of is

See the full step-by-step solution

Create a free account to read the complete working, and practise questions like this in a timed test.

Create a free account

Question ID VK-091244