Pls solve a , b , c

Dear student,
Please find below the answer:

a. The correct option is 3. The centromere is present between two chromatids. It holds together two chromatids and is a point of attachment of kinetochore.
b. The correct option is 3. Hydathodes are the secretory tissues that are found at the tips of the margins of the leaves. They secrete water through the pores in some herbaceous plants found in moist areas.  
c. The correct option is 4. Lenticels help in the gaseous exchange between the outer atmosphere and inner tissues of the stem. They are found in the woody stems of dicotyledonous flowering plants. 

Hope this clears your doubt.

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