can I start directly with respiration in plants, is there any problem?

Dear student,

Yes, you can directly start from respiration of plants chapter of your biology. But first you must read this chapter from ncert, so that you will get a good basic idea about the concepts and basic information.

And also reading ncert will be helpful for you exams.

So, definitely you can start with this chapter. Also it will not take much time of you read this chapter like a story form. So, take interest and read this chapter with free mind.