Answer: Option D. -> Wide use of ginger is made in Ayurveda to treat a host of disorders.
Answer: (d)Ayurveda makes wide use of ginger to treat a host of disorders. (a) Wide use of ginger has been made in Ayurveda to treat a host of disorders. (Tense has changed) (b) Ginger is being widely used to treat a host of disorders in Ayurveda (Tense has changed) (c) A host of disorders are made use of in Ayurveda with regard to ginger.(Meaning has changed) (d) Wide use of ginger is made in Ayurveda to treat a host of disorders.(Correct)

Answer: Option A. -> He is being tried to contact by me.
Answer: (a)I am trying to contact him. (a) He is being tried to contact by me. (Correct) (b) Contacting him is being tried by me. (Incorrect subject) (c) He tried to contact me. (Incorrect tense) (d) He is being contacting me. (Trying is missing)

Answer: Option A. -> I was startled from the deep depths of slumber by the ringing of the alarm clock.
Answer: (a)The ringing of the alarm clock startled me from the deep depths of slumber. (a) I was startled from the deep depths of slumber by the ringing of the alarm clock. (Correct) (b) The alarm clock rang and startled me from the depth of slumber. (Missing- ringing of the alarmclock) (c) The ringing of the alarm clock made me awake.(Missing – startled) (d) The alarm clock rang, startled and awakened me from sleep. (Missing- ringing of the alarm clock)

Answer: Option B. -> All living species on Earth must be taken care of by us.
Answer: (b)

Answer: Option D. -> The entire block will be demolished by them.
Answer: (d)

Answer: Option C. -> All the decisions should be adhered to by the members
Answer: (c)

Answer: Option A. -> Our institute, Pinnacle will take care of all your needs.
Answer: (a)All your needs will be taken care of at our institute, Pinnacle. (a) Our institute, Pinnacle will take care of all your needs. (Correct) (b) Our institute, Pinnacle will be taking care of all your needs. (Tense haschanged) (c) Our institute, Pinnacle will have taken care of all your needs. (Tense haschanged) (d) Our institute, Pinnacle will have cared for all your needs. (Tense has changed)

Answer: Option C. -> Rainfall has been reduced due to deforestation in tropical lands.
Answer: (c)

Answer: Option A. -> Citrus peel is bitter when it is tasted.
Answer: (a)If active voice is in the format– Sub + Verb + Adjective Passive Voice – S + H.V + Adjective + when + Pronoun (according to the Sub.) + H.V + V3V

Answer: Option B. -> You are requested to offer your remarks.
Answer: (b)Kindly offer your remarks. (a) You are being requested to offer your remarks. (Tense has changed) (b) You are requested to offer your remarks. (Correct) (c) You were requested to offer your remarks. (Tense has changed) (d) You have been requested to offer your remarks. (Tense has changed)