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100+ Free Bihar BSEB Intermediate Biology Practice Questions

Bihar School Examination Board (BSEB) Intermediate Biology Examination practice questions are available now; exam metadata is being verified.

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2026 Statistics

Key Facts: Bihar BSEB Intermediate Biology Exam

~70 / ~30

Typical theory-to-practical marks split for Intermediate Biology

BSEB Intermediate science scheme (confirm current circular)

~30%

Approximate minimum pass level; theory and practical often separate

BSEB Intermediate examination practice

119

BSEB Intermediate Biology model-paper reference number

biharboardonline.com Intermediate model papers

100

Free OpenExamPrep practice MCQs in this bank (not official item count)

OpenExamPrep

Free 2026 BSEB Intermediate Biology MCQ practice for Bihar Class 12 Science students covering NCERT units from reproduction through ecology, with theory (~70) and practical (~30) assessed separately.

Sample Bihar BSEB Intermediate Biology Practice Questions

Try these sample questions to test your Bihar BSEB Intermediate Biology exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Which of the following is an example of asexual reproduction in plants?
A.Binary fission in Amoeba
B.Vegetative propagation by runners in strawberry
C.Conjugation in Spirogyra
D.Double fertilization in angiosperms
Explanation: Runners in strawberry are modified stems that produce new plants without gamete fusion, so they illustrate vegetative (asexual) reproduction. Binary fission and conjugation are not plant vegetative propagation, and double fertilization is sexual.
2In flowering plants, the male gametophyte is represented by the:
A.Embryo sac
B.Pollen grain
C.Ovule
D.Ovary
Explanation: The pollen grain is the male gametophyte of angiosperms. After germination it produces a pollen tube carrying male gametes. The embryo sac is the female gametophyte; ovule and ovary are sporophytic structures.
3Double fertilization in angiosperms results in the formation of:
A.Zygote only
B.Endosperm only
C.Zygote and primary endosperm nucleus
D.Two zygotes
Explanation: One male gamete fuses with the egg (syngamy) to form a diploid zygote, while the other fuses with two polar nuclei (triple fusion) to form the triploid primary endosperm nucleus—together called double fertilization.
4Which cells of the human testis produce testosterone?
A.Sertoli cells
B.Spermatogonia
C.Leydig (interstitial) cells
D.Spermatids
Explanation: Leydig (interstitial) cells located in the connective tissue outside seminiferous tubules secrete testosterone under LH stimulation. Sertoli cells support spermatogenesis; spermatogonia and spermatids are germ-line stages.
5The process of release of the secondary oocyte from the ovary is called:
A.Menstruation
B.Ovulation
C.Implantation
D.Parturition
Explanation: Ovulation is the rupture of a mature Graafian follicle and release of the secondary oocyte. Menstruation is shedding of endometrium; implantation is blastocyst embedding; parturition is childbirth.
6Which contraceptive method provides protection against sexually transmitted infections (STIs)?
A.Oral contraceptive pills
B.Copper-T IUD
C.Condoms
D.Vasectomy
Explanation: Barrier methods such as condoms prevent exchange of body fluids and thereby reduce STI transmission, in addition to preventing pregnancy. Hormonal pills, IUDs, and sterilization primarily prevent pregnancy without reliable STI protection.
7In a monohybrid cross of pure tall (TT) and pure dwarf (tt) pea plants, the F1 phenotype is:
A.All dwarf
B.All tall
C.3 tall : 1 dwarf
D.1 tall : 1 dwarf
Explanation: All F1 plants are heterozygous Tt and express the dominant tall phenotype. The 3:1 ratio appears in F2 after selfing F1 plants.
8The phenotypic ratio of a classic Mendelian dihybrid cross in the F2 generation is:
A.3:1
B.1:2:1
C.9:3:3:1
D.1:1:1:1
Explanation: Independent assortment of two genes yields the F2 phenotypic ratio 9:3:3:1 for two traits each showing complete dominance.
9DNA is a polymer of:
A.Amino acids
B.Nucleotides
C.Fatty acids
D.Monosaccharides only
Explanation: DNA is a polynucleotide whose repeating units are nucleotides (deoxyribose sugar + phosphate + nitrogenous base). Amino acids polymerize into proteins; fatty acids into lipids.
10Which nitrogenous base is present in RNA but not in DNA?
A.Adenine
B.Guanine
C.Thymine
D.Uracil
Explanation: RNA contains uracil paired with adenine, whereas DNA contains thymine instead of uracil. Adenine and guanine occur in both DNA and RNA.

About the Bihar BSEB Intermediate Biology Practice Questions

Verified exam format metadata for Bihar School Examination Board (BSEB) Intermediate Biology Examination is pending. The practice questions above remain available while official exam length, timing, passing score, fee, and administrator details are reviewed.