Explanation:

• Ramdeo Misra is revered as the Father of Ecology in India. Born on 26 August 1908, Ramdeo Misra obtained Ph.D. in Ecology (1937) under Prof. W. H. Pearsall, FRS, from Leeds University in the UK. He established teaching and research in ecology at the Department of Botany of the Banaras Hindu University, Varanasi. Hence option (d) is the correct answer.
• His research laid the foundations for understanding tropical communities and their succession, environmental responses of plant populations, and productivity and nutrient cycling in tropical forest and grassland ecosystems. Misra formulated the first postgraduate course in ecology in India. Over 50 scholars obtained Ph. D degrees under his supervision and moved on to other universities and research institutes to initiate ecology teaching and research across the country.
• He was honored with the Fellowships of the Indian National Science Academy and World Academy of Arts and Science, and the prestigious Sanjay Gandhi Award in Environment and Ecology. Due to his efforts, the Government of India established the National Committee for Environmental Planning and Coordination (1972) which, in later years, paved the way for the establishment of the Ministry of Environment and Forests (1984).
• M. S. Swaminathan or Monkombu Sambasivan Swaminathan: He was born on August 7, 1925, in Kumbakonam, Tamil Nadu, India. He is an agricultural scientist, plant geneticist, Indian agronomist, administrator, and humanitarian. He is renowned for his leading role in India's "Green Revolution." It is a programme under which high-yield varieties of wheat and rice seedlings are planted in the fields of poor farmers.
• Salim Ali or Salim Moizuddin Abdul Ali: He was born on November 12, 1896, in the Bombay Presidency, British India. He was also known as the "Birdman of India." He was an Indian ornithologist and naturalist. He was also the first Indian who conducted systematic bird surveys across India and wrote various bird books that popularised ornithology in India. He played an instrumental role in creating the Bharatpur Bird Sanctuary (Keoladeo National Park).
• Sunderlal Bahuguna: He was born on January 9, 1927, near Tehri, Uttarakhand, British India. He was an Indian environmentalist and the leader of the Chipko movement. He fought for the preservation of forests in the Himalayas. In 1970, he first fought as a member of the Chipko movement and later spearheaded the anti-Tehri Dam movement from the 1980s to early 2004.