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Yes, it is possible to apply for a B.Tech degree in Information Technology after completing your Diploma in Engineering. Many universities and colleges in India offer lateral entry admission to students who have completed a diploma in engineering.
With lateral entry admission, you can directly join the second year of the B.Tech program, which will enable you to complete your degree in three years instead of four. However, the eligibility criteria for lateral entry admission vary depending on the institution.
Typically, to be eligible for lateral entry admission to a B.Tech program, you must have completed a diploma in engineering with a minimum aggregate score of 60% to 70%, depending on the institution. You may also have to appear for an entrance exam such as JEE Main or the state-level engineering entrance exam.
Therefore, I would suggest that you research the eligibility criteria and admission requirements of the institutions that you are interested in, and then apply accordingly.

Yes, you are eligible for M.Sc in Food Science and Technology at Banaras Hindu University (BHU) with a Bachelor's degree in Zoology and Chemistry. The eligibility criteria for M.Sc in Food Science and Technology at BHU is as follows:
Candidates must have a Bachelor's degree in Science with a minimum of 50% marks in the relevant subject (Zoology, Chemistry, Microbiology, Food Technology, and other related subjects).
Candidates who have appeared in the final year of their qualifying examination and awaiting results are also eligible to apply.
Therefore, since you have completed your Bachelor's degree in Zoology and Chemistry, you are eligible to apply for M.Sc in Food Science and Technology at BHU, provided you meet all other eligibility criteria and fulfill the admission requirements of the university.
To apply for the course, you need to fill the application form available on the official website of BHU, and the selection is based on the merit of the qualifying examination.