alleryStart learning →The 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.
Rajasthan Board Class 12 (RBSE) Reproduction In Organisms — practice questions
Explore 35 free Reproduction In Organisms questions in Rajasthan Board Class 12 (RBSE) Biology. Open each question or exercise to read its content, reference answers and available explanation.
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Showing questions 1–30 of 35.
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 →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 →Sort limbs by shared ancestryRead the answer and worked solution →Complete the chain from chemistry to lifeRead the answer and worked solution →True or false: variation and fitnessRead the answer and worked solution →Which process is this?Read the answer and worked solution →Darwin and selectionRead the answer and worked solution →True or false: how new species appearRead the answer and worked solution →Assertion and reasonRead the answer and worked solution →Two are true, one is notRead the answer and worked solution →Flip and pair: term with meaningRead the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →Tap every factor the chapter says can lead to new speciesRead the answer and worked solution →Order the sequence the chapter sets outRead the answer and worked solution →Reading the mechanisms backRead the answer and worked solution →True or false: evidence for evolutionRead the answer and worked solution →Chance or selection?Read the answer and worked solution →OriginsRead the answer and worked solution →Flip and pair: process with driverRead 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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