question in attachment :)-> options are:-1. a1+212= a3 2. 2a1+a2= 2a33. a1+a2= 2a34. a1+a2= a3Correct answer is 4. but pls explain how?

NEET COACHING FOR GRADE 9 STUDENT IN ABU DHABI,UAE. What are the options available

Explaination on the strength of bonds in the figure

Mam today in neet ug 2021 due to my nervousness I bubbled one wrong figure of my roll number but I have filled the roll number correctly in the blocks the invigilator adviced me to leave it as it is and to bubble the same correct figure so I did that .am very much worried what will happen

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in the stomatal apparatus why are subsidiary celss absent in cucurbits?