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AP Intermediate 2nd Year Reproduction in Organisms & Plants — practice questions — page 7

Explore 187 free Reproduction in Organisms & Plants questions in AP Intermediate 2nd Year Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Reproduction in Organisms & Plants questions and exercises with answers

Showing questions 181–187 of 187.

The mature embryo sac (female gametophyte) in flowering plants typically has:Read the answer and worked solution →The tough outer wall (exine) of pollen grains is made ofRead the answer and worked solution →Oogenesis in humans beginsRead the answer and worked solution →NEET · Biology · Contraceptive Method ↔ TypeRead the answer and worked solution →Flip and pair: process with driverRead the answer and worked solution →Fertilisation in humans typically occurs in theRead the answer and worked solution →Estrogen and progesterone are primarily secreted by:Read the answer and worked solution →

Worked practice questions

The mature embryo sac (female gametophyte) in flowering plants typically has:

  1. 8 nuclei and 8 cells
  2. 8 nuclei and 7 cells
  3. 4 nuclei and 4 cells
  4. 16 nuclei and 7 cells
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Correct answer: B. 8 nuclei and 7 cells

The typical embryo sac is 8-nucleate and 7-celled: 3 antipodals + 2 polar nuclei (in the central cell, so counts as 1 cell with 2 nuclei) + 1 egg + 2 synergids = 8 nuclei in 7 cells.

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The tough outer wall (exine) of pollen grains is made of

  1. cellulose
  2. lignin
  3. sporopollenin
  4. chitin
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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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Oogenesis in humans begins

  1. at puberty
  2. during the menstrual cycle each month
  3. before birth, during fetal life
  4. after ovulation
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Correct answer: C. before birth, during fetal life

Primary oocytes form during fetal development (~20 weeks gestation). They remain arrested in prophase I until puberty, then resume meiosis one at a time at each ovulation. Most degenerate without being released.

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