alleryThe female reproductive whorl of a flower is the
- calyx
- corolla
- androecium
- gynoecium
Show answer and solution
Correct answer: D. gynoecium
Gynoecium = female whorl (carpels).
Androecium = male (stamens).
Calyx = sepals; corolla = petals.
Bihar Board Class 12 (Science) Reproduction in Organisms & Plants — practice questions
Explore 143 free Reproduction in Organisms & Plants questions in Bihar Board Class 12 (Science) Biology. Open each question or exercise to read its content, reference answers and available explanation.
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The female reproductive whorl of a flower is theRead the answer and worked solution →A typical angiosperm embryo sac hasRead the answer and worked solution →The tough outer wall (exine) of pollen grains is made ofRead the answer and worked solution →Double fertilisation in angiosperms producesRead the answer and worked solution →Pollination of grasses occurs mainly throughRead the answer and worked solution →Self-incompatibility is a mechanism that preventsRead the answer and worked solution →Fertilisation in humans typically occurs in theRead the answer and worked solution →Oogenesis in humans beginsRead the answer and worked solution →Ovulation in a typical 28-day human menstrual cycle occurs around dayRead the answer and worked solution →Typical duration of human pregnancy is approximatelyRead the answer and worked solution →The hormone detected by home pregnancy tests isRead the answer and worked solution →The first milk produced after birth, rich in antibodies, is calledRead the answer and worked solution →A single spermatogonium ultimately produces how many functional sperm cells?Read the answer and worked solution →A single primary oocyte produces how many functional egg cells after meiosis?Read the answer and worked solution →Fertilisation in humans typically occurs in:Read the answer and worked solution →The average length of the human menstrual cycle is:Read the answer and worked solution →The LH SURGE triggers which key event in the menstrual cycle?Read the answer and worked solution →Human pregnancy lasts approximately:Read the answer and worked solution →The hormone that drives uterine contractions during childbirth (parturition) is:Read the answer and worked solution →Colostrum (the first milk after childbirth) is rich in:Read the answer and worked solution →Microsporogenesis (pollen formation) is initiated when:Read the answer and worked solution →The mature embryo sac (female gametophyte) in flowering plants typically has:Read the answer and worked solution →Pollination is best defined as the transfer of pollen from:Read the answer and worked solution →Pollination by INSECTS is called:Read the answer and worked solution →In a typical dicot embryo, the number of cotyledons is:Read the answer and worked solution →In the fruit, the OVARY WALL develops into the:Read the answer and worked solution →Parthenocarpy refers to:Read the answer and worked solution →The Reproductive and Child Health (RCH) programme replaced India's earlier Family Planning Programme in:Read the answer and worked solution →The legal minimum age of marriage in India for males and females respectively is:Read the answer and worked solution →Amniocentesis was BANNED for sex-determination purposes in India by:Read the answer and worked solution →
Worked practice questions
A typical angiosperm embryo sac has
- 3 cells, 4 nuclei
- 5 cells, 6 nuclei
- 7 cells, 8 nuclei
- 9 cells, 10 nuclei
Show answer and solution
Correct answer: C. 7 cells, 8 nuclei
7 cells, 8 nuclei: 3 antipodals, 1 central cell with 2 polar nuclei, 2 synergids, 1 egg.
The Polygonum-type embryo sac, the most common form.
The tough outer wall (exine) of pollen grains is made of
- cellulose
- lignin
- sporopollenin
- chitin
Show answer and solution
Correct answer: C. sporopollenin
Sporopollenin — the most resistant biological material known.
Survives strong acids, alkalis, and high temperatures.
Fossil pollen lasts millions of years.
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