MCQ
Which of the following statements is correct ?
- ✓Lichens do not grow in polluted areas.
- BAlgal component of lichens is called mycobiont
- CFungal component of lichens is called phycobiont
- DLichens are not good pollution indicators
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$I$. It checks the mixing of oxygenated and deoxygenated blood in heart
$II$. It circulates only oxygenated blood through heart.
Choose the correct option accordingly
$(1)$ On and average a healthy human breaths ...$X$....times/minutes
$(2)$ Every $100\, ml$ of oxygenated blood can deliver around ....$Y$.... of $O_2$ of the tissues under normal physiological conditions.
$X-Y$