12th Class Biology Quiz Ranking Challenge [June 2025]

Announcing the 12th Class Biology Quiz Ranking Challenge of 2025. Participate every month and become chance to #IAmRanker of your subjects.

Delve deep into the captivating world of biology! The 12th Class Biology Quiz Ranking Competition of 2024 is calling all bio-enthusiasts to challenge and expand their biological acumen. Participate without any fees and engage with budding biologists from around the globe.

Time: 30 Minutes for 20 Question.

Class 12th Biology Quiz Contest [June 2025]

The number of attempts remaining is 1

1 / 20

1. Which of the following is a post-fertilisation event in flowering plants?

Choose the correct option

Formation of flower

Formation of pollen grains

Transfer of pollen grains

2 / 20

2. Extrusion of second polar body from egg nucleus occurs

after entry of sperm but before completion of fertilization

after completion of fertilization

before entry of sperm

without any relation of sperm entry

3 / 20

3. In a type of apomixis known as adventive embryony, embryos develop directly from the

nucellus or integuments

zygote

synergids or antipodals in an embryo sac

accessory embryo sac in the ovule

4 / 20

4. Pollination occurs in

bryophytes and angiosperms

pteridophytes and angiosperms

angiosperms and gymnosperms

angiosperms and fungi

5 / 20

5. Haploid plants are preferred over diploids for mutation study because in haploids

recessive mutation express immediately

induction of mutations is easier

culturing is easier

dominant mutation express immediately

6 / 20

6. From among the situations given below, choose the one that prevents both autogamy and geitonogamy

None of these

Dioecious plant bearing only male or female flowers.

Monoecious plant with bisexual flowers

Dioecious plant with bisexual flowers

7 / 20

7. Budding, in hydra, is a form ________

Asexual reproduction

None of the above

Sexual reproduction

Apoptosis

8 / 20

8. Amoeba and Yeast reproduce asexually by fission and budding respectively, because they are

Unicellular organisms

Uninucleate organisms

Heterotrophic organisms

Microscopic organisms

9 / 20

9. There is no cell division involved in

spermiogenesis

embryogenesis

oogenesis

All of these

10 / 20

10. Spermatids are transformed into sperm by a process called_______.

spermiation

implantation

insemination

spermiogenesis

11 / 20

11. Which one of the following traits of garden pea studied by Mendel was a recessive feature?

Green pod colour

Round seed shape

Axial flower position

Green seed colour

12 / 20

12. A pleiotropic gene

controls multiple traits in an individual

is a gene evolved during Pliocene

control of trait only in combination with another gene

13 / 20

13. Which plant will lose its economic value if its fruits are produced by induced parthenocarpy?

Grape

Pomegranate

Banana

Orange

14 / 20

14. Choose the right one among the statements given below

IUDs increase phagocytosis reaction in the uterus

IUDs are generally inserted by the user herself

IUDs suppress gametogenesis

IUDs once inserted need not be replaced

15 / 20

15. Among the following characters, which one was not considered by Mendel in his experiments on pea?

Among the following characters

Seed – Green or Yellow

Pod – Inflated or Constricted

16 / 20

16. The method of directly injecting a sperm into ovum in assisted by reproductive technology is called

ICSI

ZIFT

GIFT

17 / 20

17. Certain characteristic demographic features of developing countries are

high fertility, low or rapidly falling mortality rate, rapid population growth and a very young age distribution

high fertility, high density, rapidly rising mortality rate and a very young age distribution

high infant mortality, low fertility, uneven population growth and a very young age distribution

high mortality, high density, uneven population growth and a very old age distribution

18 / 20

18. The part of Fallopian tube closest to the ovary is

Isthmus

Infundibulum

Cervix

Ampulla

19 / 20

19. Progesterone, which is the most important component of oral contraceptive pills, prevents pregnancy by

preventing the formation of egg

preventing the cleavage of the fertilized egg

creating unfavourable chemical environment for the sperms to survive in the female reproductive tract

blocking ovulation

20 / 20

20. Cells of corona radiata remain grouped together by

Hyaluronic acid

Hyaluronidase

Lipids

Pectins

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