76.
Two guanosine triphosphate (GTP) molecules are generated in the Krebs cycle via the reaction

77.
When the diseased stem of sugarcane is splitted open during the early stages ofthe red-rot disease.

79.
Consider the following statements regarding the germination of pollen grain and choose the correct answer:
1. The content of the pollen is a true male gametophyte
2. The pollen tube comes out due to the protrusion of the exine through the germ pore
3. When the pollen grain has germinated, the pollen tube penetrates the stigma through the stigmatic papillae
4. Some stigmas have a continuous cuticle in which pollen tubes penetrate by enzyme action