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AP Biology Unit 8O: Population Growth & Carrying Capacity — practice questions — page 2

Explore 75 free Unit 8O: Population Growth & Carrying Capacity questions in AP Biology Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Unit 8O: Population Growth & Carrying Capacity questions and exercises with answers

Showing questions 31–60 of 75.

Cleistogamous flowers:Read the answer and worked solution →From 100 microspore mother cells in an anther, how many pollen grains will be produced?Read the answer and worked solution →In a flower, anther has 4 microsporangia. Each microsporangium has 100 MMCs. Total pollen grains:Read the answer and worked solution →Which of the following best defines reproduction in animals?Read the answer and worked solution →In which year did India initiate family planning programmes at the national level?Read the answer and worked solution →Saheli, the non-steroidal once-a-week oral contraceptive for females, was developed by which Indian research body?Read the answer and worked solution →In the natural method of periodic abstinence, the couple avoids coitus during which days of the menstrual cycle?Read the answer and worked solution →The lactational amenorrhea method of contraception is reported to be effective only up to what maximum period following parturition?Read the answer and worked solution →Which of the following is correctly classified as a copper-releasing intra uterine device (IUD)?Read the answer and worked solution →Combined oral contraceptive pills are taken daily for how many consecutive days, starting preferably within the first five days of the menstrual cycle?Read the answer and worked solution →The chapter reports that the incidence of sexually transmitted infections is very high among persons in which age group?Read the answer and worked solution →In ZIFT (zygote intra fallopian transfer), embryos with up to 8 blastomeres are transferred into which part of the female reproductive tract?Read the answer and worked solution →For normal male fertility, at least what percentage of ejaculated sperms must show vigorous motility?Read the answer and worked solution →The mild uterine contractions originating from the fully developed foetus and placenta that initiate parturition are called the:Read the answer and worked solution →How many chromosomes are present in a normal human zygote immediately after fertilisation?Read the answer and worked solution →At puberty, approximately how many primary follicles remain in each ovary?Read the answer and worked solution →The Medical Termination of Pregnancy (MTP) was legalised in India in: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 →The average menstrual cycle in human females lasts approximately:Read the answer and worked solution →The menstrual phase normally lasts approximately:Read the answer and worked solution →After fertilisation, the resulting zygote first undergoes cleavage as it moves through the:Read the answer and worked solution →In a blastocyst, the outer layer attaching to the endometrium is the *trophoblast*, and the inner cluster that differentiates into the embryo is the:Read the answer and worked solution →The structural and functional unit between the developing foetus and maternal body that supports exchange of gases, nutrients and wastes is the:Read the answer and worked solution →Which of the following hormones is produced by the placenta during pregnancy?Read the answer and worked solution →Which hormone, secreted by the ovary in the later phase of pregnancy, is produced *only* during pregnancy?Read the answer and worked solution →By the end of which month/period of pregnancy is the human embryo's heart formed?Read the answer and worked solution →The average gestation period in humans is approximately:Read the answer and worked solution →The hormone primarily responsible for stronger uterine contractions during parturition is:Read the answer and worked solution →The first milk produced during the initial few days of lactation, rich in antibodies essential for the newborn's immunity, is called:Read the answer and worked solution →

Worked practice questions

Cleistogamous flowers:

  1. Insect-pollinated
  2. Wind-pollinated
  3. Never open; obligate self-pollination — bud-form structure
  4. Open flowers
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Correct answer: C. Never open; obligate self-pollination — bud-form structure

**Cleistogamy:** flowers that never open. Self-pollination assured. Found in some grasses (Oxalis, Commelina, Viola, Commelina benghalensis). Often produced in addition to chasmogamous (normal open) flowers — bet-hedging strategy. **Drawback:** no cross-fertilization → no genetic variation.

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From 100 microspore mother cells in an anther, how many pollen grains will be produced?

  1. 100
  2. 25
  3. 800
  4. 400 (each MMC → 4 microspores via meiosis → 4 pollen grains)
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Correct answer: D. 400 (each MMC → 4 microspores via meiosis → 4 pollen grains)

Each MMC undergoes meiosis → tetrad of 4 microspores → 4 pollen grains. **So 100 MMCs × 4 = 400 pollen grains.**

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In a flower, anther has 4 microsporangia. Each microsporangium has 100 MMCs. Total pollen grains:

  1. 100
  2. 400
  3. 1600 (4 × 100 × 4 pollen per MMC)
  4. 800
Show answer and solution

Correct answer: C. 1600 (4 × 100 × 4 pollen per MMC)

4 microsporangia × 100 MMCs each = 400 MMCs. Each MMC → 4 pollen grains via meiosis. Total = 400 × 4 = 1600 pollen grains. Calculation key for NEET-style multiple-step questions.

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More Biology topics

Unit 5C: Non-Mendelian Genetics & Population TransmissionUnit 2B: Membrane Transport, Tonicity & Cell SizeUnit 8K: Human Organ Systems & HomeostasisUnit 3B: Photosynthesis, Respiration & Cellular EnergyUnit 7B: Population Genetics & Hardy-Weinberg EvolutionUnit 2G: Osmoregulation & Membrane DynamicsUnit 8R: Environmental Pollution & Organismal HealthUnit 5D: Organismal Reproduction & Life Cycles