1. Saccharum officinarum: Known as the noble cane, this species is cultivated for its high sugar content.
2. Saccharum spontaneum: A wild species used for breeding and improving sugarcane varieties due to its disease resistance.
3. Saccharum barberi: Found in northern India, it is known for its tolerance to adverse conditions.
4. Saccharum sinense: Commonly cultivated in China, it has moderate sugar content and good adaptability.
These species play a vital role in sugarcane production and breeding programs.
In the adjoining figure, \( AP = 1 \, \text{cm}, \ BP = 2 \, \text{cm}, \ AQ = 1.5 \, \text{cm}, \ AC = 4.5 \, \text{cm} \) Prove that \( \triangle APQ \sim \triangle ABC \).
Hence, find the length of \( PQ \), if \( BC = 3.6 \, \text{cm} \).
In the adjoining figure, $\triangle CAB$ is a right triangle, right angled at A and $AD \perp BC$. Prove that $\triangle ADB \sim \triangle CDA$. Further, if $BC = 10$ cm and $CD = 2$ cm, find the length of AD.