Biology Most Tricky Questions - NEET 2026 | Tina Ma'am

追加: 2026-05-11

[00:00:04]Hi guys, welcome back to an academy neat English channel. My name is Tina and I'm your biology educator. This session is going to be special because in this session I am going to discuss only those questions which have been sent by you my beautiful students for uh you wanted me to discuss these questions which you found tricky during your neat 2026 exam.

[00:00:24]So these questions are your questions which you wanted me to discuss. And now also during the session we are going to see whether these questions were really tricky or was it just an exam stress which made you made such mistakes. Yes, the paper was lengthy. Yes, there were few questions which were tricky. What was the tricky part or was it just NTA playing with your mind because of that exam fear? Let's delve into it and see to that. So there are few questions that you have sent me. Number one question, which of the following statements are correct with respect to the transcription unit? Now the chapter itself, molecular basis, you know, it excites it incites that feeling of awe and feeling of uh um you know that fear in us. Now see this question you have to find the correct statements with reference to transcription unit. Now read very carefully you will see these are the lines exactly from NCRT. So the transcription unit in DNA is defined primarily by three regions which is promoter, terminator and structural gene. Is this correct? Yes, absolutely true. So there are three components. Now the promoter is said to be located towards the five dash end of the structural gene upstream. Remember and it is written in the quotes that reference point is always taken with respect to the coding strand. This is true. Promoter is a DNA sequence that bind that provides binding site for RNA polymerase from where the this uh transcription initiates. So this is true. The promoter defines the template and the coding strand. Yes, if you change the location of the promoter, the coding and the non-coding strand also becomes different. And then terminator is towards the three dash end of the coding strand. The reference point is coding strand and defines the end of the process that is termination. This is true. So what is the correct statement?

[00:02:15]Answer would be all the statements are right.

[00:02:19]Not very tricky question. Lengthy. Yes.

[00:02:22]Because of that lengthiness, you know, we we are already in that uh state.

[00:02:27]Okay. Hurry up. And then we tend to forget things that we have already read in NCERT. These are clearcut NCERTT lines. Moving on to the next question here. Next question is match the following uh conjunctive tissue. Now conjunctive tissue you read about that in dicord root. It is a tissue that separates xylem and phium. Do you remember it is a tissue between this and you read about it in dicord root be it dord or monocott we have this conjunctive tissue in both to separate to separate the xylem and phim because xyllem and pheim are on different radius they are separated by this conjunctive tissue.

[00:03:08]Now a is this casparian strips in the name of scientist casparian. These strips are the endodermal cells which have subbrin deposition. Remember that barrel-shaped cells those barrel-shaped cells right and they were lined by the subin deposition which makes this water impermeable that is casperian strips.

[00:03:30]Where do you read about it? Again this is a part of dicot or monocott root.

[00:03:36]Then subsidiary cells. These are the specialized cells in vicinity of guard cells. Whatever be the shape of guard cell. So there is this cell which is present adjacent to the guard cell which is called subsidiary cells. And then starch sheath you read about starch sheath in dort stem only. So it is in dicot stem where endodermal cells are rich in starch and hence the name. Are you getting that? So was it tricky? Uh the students who have sent me they made this mistake with respect to conjunctive tissue. But never mind it was not very tricky. It was just examination fear.

[00:04:15]Now if you want to practice yourself with such questions, make sure that you practice the right type of questions.

[00:04:22]You must know how to solve these questions. It is very important guys that we solve these questions together.

[00:04:29]So don't forget to attend all the classes. Don't forget to solve questions on the special classes and give as many tests as possible. Now see which of the following statements are not true regarding the restriction endonucleus.

[00:04:44]Not true. They are called molecular scissors. This is true. These are the enzymes responsible for restricting the growth of bacteria phasages and e.coli.

[00:04:52]Yes. And we know that restriction enzymes are found extracted from the bacteria. What are they doing in the bacteria? They act like their cellular defense. If a bacteria phase or a virus attacks them, these enzymes are going to kill the viral DNA. Then they cut DNA at the center of pelendromic site that is right. But it is saying only at the pelindromic site only sorry only at the center of the pelindromic site. This is wrong. We know gatuk eori1 is not going to cut it in the center. It is going to cut it little away from the center between G and C. So only word makes it wrong. They remove the nucleotides only from the ends. Now that is also wrong. There are certain cases where it cuts right in between not in case of gut but yes and it results in the formation of blunt ends.

[00:05:42]Right? So this only word makes it wrong.

[00:05:45]They recognize specific pelromic based sequences. This is true. Every enzyme, every uh restriction enzyme has a specific site that it recognizes. So which are the wrong statements? It says not true. It is C and D. Moving on to the next question guys. Now arrange the following steps of DNA fingerprinting.

[00:06:06]Now this in the correct sequence. Have you noticed something about meat or NTA?

[00:06:12]They are loving these sequence based questions. It started 2024. Even before that one or two questions used to be sequent based. But since 2025, the uh you know frequency of these sequence based questions has increased so much.

[00:06:29]So you know what am I trying to say? You have to practice such questions and we did practice these questions sequence based questions in our classes. So make sure we do that again. And moving on to this. So DNA fingerprinting this sequence is clearly given in your NCERT six steps but they have summarized it in five because isolation of DNA digestion by restriction enzymes. These are two points in NCRT they've clubed together.

[00:06:55]This is step number one. After isolation and after digestion we need to separate them. This is step number two. After separation they will be transferred to the synthetic membranes nitro cellulose and nylon written in NCERTT. Step number three, can we do that now? A E C A E C answer will be this. And then after hybrid this uh transferring to the synthetic membranes, we hybridize it with labeled V and TR probes. And finally, it is detected using auto radiography. This is number five. So the sequels are clearly given in NCRT. There was nothing to get confused about. But I know these tricky questions were actually lengthy. It was the length of the exam and the ticking clock which made you mistakes made you make mistakes in uh in such questions. So we need to prepare ourselves better next time. All right. Finding out the incorrect statement about photosynthesis. It says the water splitting complex is associated with PS1. No, it is associated with PS2. when the PS electron from PS2 is lost, it is compensated by the splitting of water.

[00:08:09]So this is a wrong statement. C4 plants use C3 pathway or CO2 fixation as the main biosynthetic pathway. Now this is where you made mistake and this can be a tricky point uh statement. See understand be it C4 plants or be it C3 plants first of all you have to be very clear about the two things C3 plant and C3 cycle okay and then C4 plant and C4 cycle so please understand whether it is C3 plant or I'm talking about the plant or it is the C4 plant both the plants show C3 cycle this under this goes on in both the plants. In fact, it is the C3 cycle only during which food is produced. So, it is an absolutely right statement that C4 plants use C3 pathway as a main biosynthetic pathway. Biosynthetic is where actually starch is produced or glucose is produced. Right? Now, the difference is that C4 plants also show C4 cycle. Now this C4 cycle does not happen here right and we know that why this happens here C2 cycle will occur which will not occur here but I'm I we let's just discuss these two cycles here in C4 plant C4 cycle will occur first and then it will be followed by C3 cycle but C3 has to occur so this is true in C4 plants photorespiration does not occur this is right see it says C3 plants plants exhibit Kren's anatomy.

[00:09:50]Now Krenn's anatomy is not shown by these there is no Kren's anatomy in the C4 plants.

[00:09:56]This anatomy is a characteristic feature of only C4 plants. ATP synthesis whether it occurs C in C3 or C4 it will only and always occurs through chemiosmosis. Four protons move out from lumen into the stroma forming one ATP molecule. So now it's asking incorrect statements and incorrect statements are A and D. Answer would be C. Now yes this question can be considered a little tricky. Then moving on to this question. Since original diversification there have been five episodes. How is the sixth extinction different from the previous episodes?

[00:10:32]Now you might say why ma'am why this question? This was the easiest questions. Isn't that I understand. Now please relax and listen. Some of you have got so excited looking at the questions. Even those who have made this mistake knew the answer. But just because of you know that hyper excitation. Oh wow. We know the answer.

[00:10:54]You forgot to notice that it is written 10 times here and 100 to,000 times here.

[00:11:00]So answer is sixth extinction is worse because it is 100 to,000 times faster not 10 times faster. So not tricky but that excitation of knowing the answer.

[00:11:13]Okay, excitedness right that made us go wrong. Then looking at the next question correct statement with reference to packaging of DNA helix. Histones are organized to form a unit of eight molecules. Histone octimer. Yes or no?

[00:11:26]Yes. Histones are negatively charged.

[00:11:29]Now histones are basic proteins. This part is right. But if it is basic it can't be negative. It has to be positively charged. Now this is the wrong statement. Then it says histones are rich in basic amino acids. Yes, it is rich in basic amino acids. That's why the protein nature is also basic. This is two. Then positively charged DNA.

[00:11:52]Again wrong. See DNA is acidic and what is acidic is negatively charged. So this is a wrong statement. Now packaging of chromatin at higher levels when we are condensing the chromatin to form chromatin fibers and then chromosome then additional set of proteins called NFC proteins non-histone chromosomal proteins are also needed. So we need to mark the correct statement which is A, C and E. Answer would be three. Answer would be three. Now see here regarding the frog's anatomy says hippatic portal system is a special venus connection between liver and intestine. This is true. This is also present in humans. There are 12 pairs.

[00:12:37]That is wrong. There are 10 pairs.

[00:12:39]Uratus and ovidu open separately into the cloa in the female. Now this was a tricky statement. A little tricky for those who got it confused with the male frog. See we we have read that cloa is a common opening for urinary bladder for elementary canal and the opening of the elementary canal and the reproductive canal right but in case of males guys we know urtor is a common duct for and that for urine and sperms and therefore we call it urinogenit so in that case there will be two but here there will be three different openings urus and ovducts in females they don't converge right they are going going to open separately. This is true. And then hindb brain consists of cerebellum right middleangata, right? But optic loes, no optic loes is a part of midbrain. So this is also a wrong statement. And then it says sinus minosis joins the right atrium. Yes, this is that chamber where all the three pre uh all the three venas two preva and one post cava they open and then sinosis further opens from the dorsal side of the heart. So this is true. So you have to mark the correct statements guys. Correct statement would be a c and e. Answer is three. Answer is three. Then now this was less tricky. There was just one statement which was wrong. Motor neuron. Yes, the neuron which gets message to the muscle is a motor neuron.

[00:14:10]Send signal sent by the CNS to the sarma of the muscle fiber. Right? So this is true. Neural signal generates an action potential which causes the release of calcium ions in the from the saropplasmic reticulum. Remember it is a storehouse of calcium ions and on the arrival of impulse it releases calcium.

[00:14:30]This is true. Then increase in calcium inactivates the actin. No, calcium is going to bind with troponin TPC and it is going to unmask gradually. It is going to unmask the meiosin binding sides on actin. So it will not inactivate.

[00:14:48]Is that clear? So this is wrong. Actin binds the meiosin head to form the crossbridge. Yes. Whenever actin and meiosin they will bind to each other.

[00:14:56]This linkage is called crossbridge formation. This is true. And then it says sar shortening of sarcomia takes place during the pulling of by the pulling of actin filaments towards the center. So it is the thin filaments which will slide over the thick filament and they move towards the center. Right?

[00:15:14]While the thick filaments which represent the a band they will not move towards the center. This is true. So which is the correct statement it says.

[00:15:24]So everything other than c answer will be two. So guys, now if you want to practice more such questions which you have already done uh before the neat exam also and you want to practice more such questions then don't forget to join me in my batch in my batch which is Phoenix 2.0 batch for neat UG and this will be a complete English batch for class 12 and dropper students. Now it's not that if you buy this batch if you take this batch then you will be restricted to watch our lectures only.

[00:15:56]You can watch every other educator's lecture also. You'll get 600 plus live lectures. So during the live lecture also you can always ask your doubts which is the most beautiful thing. Why?

[00:16:07]Because until and unless your doubts are solved properly we are not prepared. So make sure that you ask your doubts.

[00:16:16]I always see students solving so many questions never asking any doubts. That is useless activity. You have to solve questions and it is mandatory if you are solving so many questions you will come across some doubts. So make sure that you solve those doubts during the live lectures also and then there are other discussion batches for the uh for the test uh discussion. Then there are WhatsApp groups for your uh for your doubt session. So we are always available to you. There will be 15 plus tests. So the mistakes that you have made in your exam if you would solve the questions properly you will take the test properly you will make mistakes earlier than the neat exam. See mistakes are a part of our nature. We cannot live without making mistakes be it young or old we all make mistakes but why is practice so much important? Because the mistakes which you're going to make on the final day they can be made before and worked upon. Right? And then make sure that you join the batch quickly because the classes are going to commence from 20th May. And if you enroll guys now see the fee structure has become little different. So there's a limit. This is a limited offer for a plus batch. It is 3982 plus GST. So you can join the plus batch. This is for complete one year till 10th May. If you join now 20th May to 10th May, this this is the duration of the batch and you can join your plus batch in under 4,000. And then if you go for the iconic batch, it is uh 11,6 rupees plus GST. So this is a limited offer and it cannot be better than this right now. See, so you'll be open to watching the lectures of all the educators. So there are so many batches which are starting in English. just one batch starting in English. So you can always choose your educators. Okay. And make sure that yes and make sure that you do join these batches quickly. Don't delay because the initial classes are the foundation classes where we work on so many things.

[00:18:24]So make sure that you join us in time so that we can work on the mistakes and we can clear our neat exam. we can crack our neat exam with flying colors. I'll see you in the classes. All the best.