Start learning →

ISC Class 12 Reproduction in Organisms & Plants — practice questions — page 4

Explore 98 free Reproduction in Organisms & Plants questions in ISC Class 12 Biology. Open each question or exercise to read its content, reference answers and available explanation.

Practise Reproduction in Organisms & Plants with Quill →

Reproduction in Organisms & Plants questions and exercises with answers

Showing questions 91–98 of 98.

Flip and pair: term with meaningRead the answer and worked solution →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

Flip and pair: term with meaning

Read exercise and reference answers
Matching pairs
  1. A
    Chemical evolution
    B
    formation of biomolecules
  2. A
    Natural selection
    B
    Darwin's mechanism
  3. A
    Genetic drift
    B
    chance change in a population
  4. A
    Habitat fragmentation
    B
    a population split into patches
  5. A
    Homology
    B
    shared structure from common ancestry
The chapter's vocabulary. Source: syllabus Biology, Evolution.

Open this exercise →

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
Show answer and solution

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.

Open this question →

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

  1. cellulose
  2. lignin
  3. sporopollenin
  4. 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.

Open this question →

How to practise

  1. Choose a Reproduction in Organisms & Plants question and try to work out your answer.
  2. Open the question to check the correct answer and read its worked solution.
  3. Continue in the app for bite-sized lessons, explanations and review with Quill. You can start without creating an account.

Put it into practice

Continue with Reproduction in Organisms & Plants practice for ISC Class 12. Read explanations as you go. No signup form needed to start.

Practise Reproduction in Organisms & Plants →

More Biology topics

Genetics and EvolutionBiotechnology and ApplicationsBiology in Human Welfare & HealthEcology and Environment