The humble son of a farmer from Sarakkalvilai village in Tamil Nadu’s Kanyakumari dis trict, Dr. K. Sivan as Indian Space Research Organization (ISRO) chairman was leading the Chandrayaan-2 mission to moon. Sivan studied in a Tamil medium government school. After graduating from S.T. Hindu College in Nagercoil, Sivan completed a Master’s in Engineering from IISC in 1982. In 2006, he received Ph.D in Aerospace Engineering from IIT Bombay. Sivan is the first graduate in his family. His brother and two sisters were unable to complete higher education due to their poverty. ”When I was in college, I used to help my father in the f ield. That was the reason he got me admitted in a college near our house.” Sivan told TOI, ”Only when I had completed my B.Sc (Mathematics) with 100% marks his mind changed.” Sivan said he had spent his childhood days without a shoe or sandal. ”I continued wearing vesti (dhoti) till college. I wore pants for the first time when I entered MIT.” He joined ISRO in 1982 and worked on almost all rocket programmes. Before taking charge as an ISRO chairman in January, 2018, he was the director of Vikram Sarabhai Space Centre (VSSC) which develops rockets. He is known as ISRO’s ’Rocket Man’.

Answer the following questions in few words. (One or two words) :
What is Dr. Sivan known as ?
In which subject Dr. Sivan scored 100% marks in B.Sc. ?
When did Dr. Sivan join ISRO ?
In which space centre Dr. Sivan was the director ?
Step 1: Understanding the Questions:
The task is to provide short, precise answers to four factual questions based on the passage.
Step 2: Finding the Answers in the Passage:
- : The last sentence of the passage states, "He is known as ISRO's 'Rocket Man'."
- : The passage quotes Dr. Sivan: "...completed my B.Sc (Mathematics) with 100% marks..."
- : The passage mentions, "He joined ISRO in 1982..."
- : The passage says, "...he was the director of Vikram Sarabhai Space Centre (VSSC)..."
Step 3: Final Answers:
ISRO's 'Rocket Man'
Mathematics
1982
Vikram Sarabhai Space Centre (VSSC)

Write any four problems faced by the animals that thrive in forests and oceans: 
Verbal to Non-Verbal:
A stain is an unwanted mark of discolouration on a fabric caused due to contact with another substance which cannot be removed by the normal washing process. Stains can be grouped on the basis of their origin, e.g. tea, coffee and fruits come from vegetable source. Stains from shoe polish, tar, oil paints come under grease stains. Animal stains comprise of stains formed by milk, blood and eggs, whereas marks on your clothes after sitting on an iron bench are those of rust and come under mineral stains. Then there are stains that are formed due to dye, into perspiration which can be categorised under miscellaneous stains. Read the given passage and complete the table. Suggest a suitable title. 

Study the entries in the following table and rewrite them by putting the connected items in the single row: 