Questions

Johann Strauss's on the Banks of the Beautiful Blue Danube

Nigeria, an African country on the Gulf of Guinea. 

Nigeria has a Federal Republic and Presidential system of Government.

Postmodernism is the literary period, the beat generation aligned with. Postmodernism refers to mid to late 20th century.

A line on a map connecting points that have the same average percentage of cloudiness is called Isoneph.

National Science Centre is located at New Delhi.

Yes, plant cells have Mitochondria.

While plant cells have chloroplasts to photosynthesize, they also require ATP for cellular functions, and do use oxygen to break down some of the sugar they produce in order to generate that ATP. They need mitochondria for this.

In particular, at night when there is no light, plants undergo cellular respiration since there is no sunlight to photosynthesize.

They do, however, produce far more sugar and oxygen through photosynthesis than they use up in respiration.