2025 NEET Biology Practice Test || Exam Questions 21-30

21. Given below are the stages in the life cycle of pteridophytes. Arrange the following stages in the correct sequence.
A. Prothallus stage
B. Meiosis in spore mother cells
C. Fertilisation
D. Formation of archegonia and antheridia in gametophyte.
E. Transfer of antherozoids to the archegonia in presence of water.
Choose the correct answer from the options given below:

(1) B, A, D, E, C (2) B, A, E, C, D (3) D, E, C, A, B (4) E, D, C, B, A

22. Cardiac activities of the heart are regulated by:
A. Nodal tissue
B. A special neural centre in the medulla oblongata
C. Adrenal medullary hormones
D. Adrenal cortical hormones
Choose the correct answer from the options given below:

(1) A, B and C Only. (2) A, B, C and D (3) A, C and D Only (4) A, B and D Only

23. Which of following organisms cannot fix nitrogen?
A. Azotobacter
B. Oscillatoria
C. Anabaena
D. Volvox
E. Nostoc
Choose the correct answer from the options given below:

(1) A only (2) D only (3) B only (4) E only

24. Given below are two statements:
Statement I: Transfer RNAs and ribosomal RNA do not interact with mRNA.
Statement II: RNA interference (RNAi) takes place in all eukaryotic organisms as a method of cellular defence.
In the light of the above statements, choose the most appropriate answer from the options given below:

(1) Both statement I and statement II are correct (2) Both statement I and statement II are incorrect (3) Statement I is correct but statement II is incorrect (4) Statement I is incorrect but statement II is Correct

25. In the above represented plasmid an alien piece of DNA is inserted at EcoRI site. Which of the following strategies will be chosen to select the recombinant colonies?

(1) Using ampicillin & tetracyclin containing medium plate. (2) Blue color colonies will be selected. (3) White color colonies will be selected. (4) Blue color colonies grown on ampicillin plates can be selected.

26. Which of the following genetically engineered organisms was used by Eli Lilly to prepare human insulin?

(1) Bacterium (2) Yeast (3) Virus (4) Phage

27. Name the class of enzyme that usually catalyze the following reaction:
S – G + S# → S + S# – G
Where, G → a group other than hydrogen
S → a substrate
S# → another substrate

(1) Hydrolase (2) Lyase (3) Transferase (4) Ligase

28. Find the statement that is NOT correct with regard to the structure of monocot stem.

(1) Hypodermis is parenchymatous. (2) Vascular bundles are scattered. (3) Vascular bundles are conjoint and closed. (4) Phloem parenchyma is absent.

29. The correct sequence of events in the life cycle of bryophytes is
A. Fusion of antherozoid with egg.
B. Attachment of gametophyte to substratum.
C. Reduction division to produce haploid spores.
D. Formation of sporophyte.
E. Release of antherozoids into water.
Choose the correct answer from the option given below:

(1) D, E, A, C, B (2) B, E, A, C, D (3) B, E, A, D, C (4) D, E, A, B, C

30. Which are correct:
A. Computed tomography and magnetic resonance imaging detect cancers of internal organs.
B. Chemotherapeutics drugs are used to kill noncancerous cells.
C. α-interferon activate the cancer patients’ immune system and helps in destroying the tumour.
D. Chemotherapeutic drugs are biological response modifiers.
E. In the case of leukaemia blood cells counts are decreased.
Choose the correct answer from the option given below:

(1) B and D only (2) D and E only (3) C and D only (4) A and C only

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