"High Cohesiveness In A Group Leads To Higher Group Productivity." Do You Agree Or Disagree?

Yes. Off course I do agree, why do I agree because, effective productivity could only be achieved by synergy that is found by the help of the cohesiveness hence I must state while agree on the same

Yes I do agree with the phrase. Productivity is known as a ratio of output to the resources used to produce this output and affect of high cohesiveness on higher group productivity can be measured very easily on the following parameters.
1-efficiency in utilizing resources
2-quality
3- volume of work produced
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Yes.  I agree with the same

Yes.  I agree with the same

Yes, I fully agree with the above