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AP Intermediate 2nd Year Biology — practice by topic

Browse 1,035 questions across 15 Biology topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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Biology topics

Genetics and Evolution (210)Reproduction in Organisms & Plants (187)Biotechnology and Applications (167)Biology in Human Welfare & Health (116)Ecology and Environment (79)Reproductive Health (77)Organisms and Populations (50)Biodiversity and Conservation (49)Evolution (30)Ecosystem (20)Human Health and Disease (16)Sexual Reproduction in Flowering Plants (13)Biotechnology and its Applications (11)Biotechnology: Principles and Processes (5)Human Reproduction (5)

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For normal male fertility, at least what percentage of ejaculated sperms must show vigorous motility?Read the answer and worked solution →At puberty, approximately how many primary follicles remain in each ovary?Read the answer and worked solution →The new membrane that forms around the secondary oocyte just before ovulation is called the:Read the answer and worked solution →In human females, the first menstruation at puberty is termed:Read the answer and worked solution →

Worked practice questions

For normal male fertility, at least what percentage of ejaculated sperms must show vigorous motility?

  1. 80%
  2. 40%
  3. 20%
  4. 60%
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Correct answer: B. 40%

As per your syllabus, at least **40% vigorous motility** AND at least **60% normal shape/size** are required for normal fertility.

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At puberty, approximately how many primary follicles remain in each ovary?

  1. 1 - 2 million
  2. 60,000 - 80,000
  3. 5 - 10 million
  4. 1,000 - 2,000
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Correct answer: B. 60,000 - 80,000

A large number of primary follicles degenerate during the phase from birth to puberty. Only **60,000–80,000 primary follicles** remain in each ovary at puberty.

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The new membrane that forms around the secondary oocyte just before ovulation is called the:

  1. Zona pellucida
  2. Theca interna
  3. Vitelline membrane
  4. Corona radiata
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Correct answer: A. Zona pellucida

The **zona pellucida** is the glycoprotein membrane that surrounds the secondary oocyte. Sperm must penetrate it to fertilise the ovum, and after entry of one sperm it blocks further sperms.

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