Many would question and decide that Jesus being God why can't he predict if there was a fruit in the Fig Tree or not, why he just should not bring the fruits if he was hungry? (It would have been the same temptation when he was asked to make bread out of stone), Why should he curse it?

God's concern about his people - Israel related here as "Trees bearing fruits", but disappointed God by bearing sour fruit or by being fruitless.

Jesus told that he is the "True Vine" and we are the branches. To bear fruit the branch has to be with the True Vine, on alone it can't bear the fruit. This is the same with Salvation, it's not something that we can acheive ourselves, it has to be given by God for the faith that we have in him.

Jonah 4 NASB
Jonah’s Displeasure Rebuked
1But it greatly displeased Jonah and he became angry. 2He prayed to the LORD and said, “Please LORD, was not this what I said while I was still in my own country? Therefore in order to forestall this I fled to Tarshish, for I knew that You are a gracious and compassionate God, slow to anger and abundant in lovingkindness, and one who relents concerning calamity. 3“Therefore now, O LORD, please take my life from me, for death is better to me than life.” 4The LORD said, “Do you have good reason to be angry?”

5Then Jonah went out from the city and sat east of it. There he made a shelter for himself and sat under it in the shade until he could see what would happen in the city. 6So the LORD God appointed a plant and it grew up over Jonah to be a shade over his head to deliver him from his discomfort. And Jonah was extremely happy about the plant. 7But God appointed a worm when dawn came the next day and it attacked the plant and it withered. 8When the sun came up God appointed a scorching east wind, and the sun beat down on Jonah’s head so that he became faint and begged with all his soul to die, saying, “Death is better to me than life.”

9Then God said to Jonah, “Do you have good reason to be angry about the plant?” And he said, “I have good reason to be angry, even to death.” 10Then the LORD said, “You had compassion on the plant for which you did not work and which you did not cause to grow, which came up overnight and perished overnight.11“Should I not have compassion on Nineveh, the great city in which there are more than 120,000 persons who do not know the difference between their right and left hand, as well as many animals?”

Mark 11:12-25 New International Version (NIV)

Jesus Curses a Fig Tree and Clears the Temple Courts

12 The next day as they were leaving Bethany, Jesus was hungry.13 Seeing in the distance a fig tree in leaf, he went to find out if it had any fruit. When he reached it, he found nothing but leaves, because it was not the season for figs. 14 Then he said to the tree, “May no one ever eat fruit from you again.” And his disciples heard him say it.

15 On reaching Jerusalem, Jesus entered the temple courts and began driving out those who were buying and selling there. He overturned the tables of the money changers and the benches of those selling doves,16 and would not allow anyone to carry merchandise through the temple courts. 17 And as he taught them, he said, “Is it not written: ‘My house will be called a house of prayer for all nations’[a]? But you have made it ‘a den of robbers.’[b]”

18 The chief priests and the teachers of the law heard this and began looking for a way to kill him, for they feared him, because the whole crowd was amazed at his teaching.

19 When evening came, Jesus and his disciples[c] went out of the city.

20 In the morning, as they went along, they saw the fig tree withered from the roots. 21 Peter remembered and said to Jesus, “Rabbi, look! The fig tree you cursed has withered!”

22 “Have faith in God,” Jesus answered. 23 “Truly[d] I tell you, if anyone says to this mountain, ‘Go, throw yourself into the sea,’ and does not doubt in their heart but believes that what they say will happen, it will be done for them. 24 Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours. 25 And when you stand praying, if you hold anything against anyone, forgive them, so that your Father in heaven may forgive you your sins.”

Matthew 21:18-22 New International Version (NIV)

Jesus Curses a Fig Tree

18 Early in the morning, as Jesus was on his way back to the city, he was hungry. 19 Seeing a fig tree by the road, he went up to it but found nothing on it except leaves. Then he said to it, “May you never bear fruit again!” Immediately the tree withered.

20 When the disciples saw this, they were amazed. “How did the fig tree wither so quickly?” they asked.

21 Jesus replied, “Truly I tell you, if you have faith and do not doubt, not only can you do what was done to the fig tree, but also you can say to this mountain, ‘Go, throw yourself into the sea,’ and it will be done. 22 If you believe, you will receive whatever you ask for in prayer.”