निम्नलिखित में से कौन सा सजावटी पौधा व्यावसायिक रूप से दृढ़-काष्ठ तना कर्तन (hardwood stem cutting) द्वारा प्रवर्धित किया जाता है?

Which of the following specialized vegetative structures is primarily used for the propagation of Dahlia?

Which of the following pairs is a correct example of a plant propagated by a corm and a sucker, respectively?