M.Sc

No, you can not pursue M.Sc nursing after completing B.Sc zoology (Hons.). Please refer to the eligibility criteria below:
The eligibility required for M.Sc nursing:-
1) The candidate should be a Registered Nurse and Registered midwife or equivalent with any Stat Nursing Registration Council.
2) The minimum education requirements shall be the passing of B.Sc nursing
/ B.Sc (Hons.) Nursing / Post Basic B.Sc. Nursing with a minimum of 55% aggregate marks.
3) The candidate should have undergone in B.Sc. Nursing / B.Sc (Hons.) nursing
/ Post Basic B.Sc nursing in an institution which is recognised by Indian Nursing Council.
4) Minimum one year of work experience after basic B.Sc nursing.
5) The candidate shall be medically fit.
6) 5% relaxation of marks for SC/ST candidates may be given.

Hello Vemula,
Geologists supervise exploration work in deserts, ocean floors, riverbeds, mountains, etc.They research and carry out a scientific study with organizations involved in geological work who locate physical data and material for study from near Earth's surface and in the sea. Analyse information collected through seismic prospecting; examine surface rocks and samples of buried rocks, study information collected by satellites. Identify rocks, minerals, and fossilsConduct geological surveys, construct maps, measure Earth's gravity and magnetic field. Research for locating oil, natural gas, and minerals. Work in laboratories to study samples from the earth or seabed. Study the flow of oil and water through rocks. In government departments, they monitor waste disposal sites and water supplies.
Geological Survey of India and the Central Ground Water Board select geologists through an examination conducted by the Union Public Service Commission (UPSC). Geologists work in the private sector as consultants. They are involved in exploration and survey. Geologists are recruited with companies such as Oil and Natural Gas Commission (ONGC), Hindustan Zinc Ltd, Coal India, Mineral Exploration Ltd. Oil and Natural Gas Commission. ONGC holds annually a written examination in two parts. The papers are in General Studies, English and Geology. This is followed by an interview. The selection is based on vacancies.Oil India Limited is involved in oil exploration. The Mineral Oil Exploration Corporation Limited interviews academically bright candidates for placement. Hindustan Zinc Ltd. (HZL) and Coal India Ltd. offer jobs after a written examination of two papers followed by the interview. The Atomic Mineral Division at Hyderabad functions under the ministry of Atomic Energy. The recruitment examination is exclusively in geology and has an objective paper and a test of practical knowledge. Selected candidates have to take an interview. The National Geophysical Research Institute at Hyderabad and the National Institute of Oceanography in Goa select geologists with specialization with a doctorate qualification. Similar openings are in Wadia Institute of Himalayan Geology in Dehradun. In Research geologists work as research associates with institutions like the Council of Scientific and Industrial Research (CSIR) and the department of Science and Technology. These institutions also recruit geologists as scientific officers. Doctorates are preferred for these posts.