Bro you'll have to pay 1k atleast to get it from online stores as soft copy of this isn't listed on any Website buy it from Amazon or flipkart. Hope you get it there. Thank you 

Sorry there is not even a single site or link from where you can download the PDF version Trueman's Objective Biology. I would suggest you to buy it. There are two volumes priced at Rs. 1,220 on Amazon and Rs. 1,000 on Flipkart.