1. Which hormone causes ovulation?
- Testosterone
- LH
- FSH
- Progesterone
Answer: B) LH
Explanation: A surge of LH triggers egg release. O Level Biology · Topic 16 Development of Organisms and Continuity of Life · 16.4 Sexual reproduction in humans
MCQs / Biology / O Level Biology: Development of Organisms and Continuity of Life
O Level Biology: Development of Organisms and Continuity of Life MCQs — Biology
36 multiple-choice questions on O Level Biology: Development of Organisms and Continuity of Life from Biology, each with the correct answer and, where available, a teacher's explanation. Read through them to revise the chapter, then practise the same questions one by one to test yourself.
2. Which process uses mitosis?
- Making eggs
- Making sperm
- Producing pollen grains
- Repair of damaged skin
Answer: D) Repair of damaged skin
Explanation: Repair uses mitosis. O Level Biology · Topic 16 Development of Organisms and Continuity of Life · 16.1 Nuclear division
3. After fertilisation, the ovary develops into the
- seed
- fruit
- testa
- stamen
Answer: B) fruit
Explanation: Ovary → fruit; ovule → seed. O Level Biology · Topic 16 Development of Organisms and Continuity of Life · 16.3 Sexual reproduction in plants
4. The acrosome of a sperm contains
- enzymes to digest a way into the egg
- DNA only
- mitochondria
- a flagellum
Answer: A) enzymes to digest a way into the egg
Explanation: Acrosome enzymes penetrate the egg. O Level Biology · Topic 16 Development of Organisms and Continuity of Life · 16.4 Sexual reproduction in humans
5. Which structure produces sperm?
- Testis
- Sperm duct
- Prostate gland
- Urethra
Answer: A) Testis
Explanation: Testes make sperm. O Level Biology · Topic 16 Development of Organisms and Continuity of Life · 16.4 Sexual reproduction in humans
6. The pollen tube grows
- up the filament
- into the anther
- down the style to the ovule
- out of the petal
Answer: C) down the style to the ovule
Explanation: The pollen tube carries the male nucleus to the ovule. O Level Biology · Topic 16 Development of Organisms and Continuity of Life · 16.3 Sexual reproduction in plants
7. Chromosomes are made of
- glucose
- protein only
- fat
- DNA
Answer: D) DNA
Explanation: Chromosomes contain DNA carrying genes. O Level Biology · Topic 16 Development of Organisms and Continuity of Life · 16.1 Nuclear division
8. Insect-pollinated flowers have
- feathery stigmas
- no petals
- large, sticky pollen grains
- light, smooth pollen
Answer: C) large, sticky pollen grains
Explanation: Sticky pollen attaches to insects. O Level Biology · Topic 16 Development of Organisms and Continuity of Life · 16.3 Sexual reproduction in plants
9. The function of the amniotic fluid is to
- produce hormones
- supply oxygen
- protect the fetus from knocks
- remove urea
Answer: C) protect the fetus from knocks
Explanation: Amniotic fluid cushions the fetus. O Level Biology · Topic 16 Development of Organisms and Continuity of Life · 16.4 Sexual reproduction in humans
10. The part of the embryo that grows into the first root is the
- radicle
- testa
- cotyledon
- plumule
Answer: A) radicle
Explanation: The radicle emerges first as the root. O Level Biology · Topic 16 Development of Organisms and Continuity of Life · 16.3 Sexual reproduction in plants
11. An advantage of sexual reproduction is
- only one parent is needed
- variation, helping populations adapt to change
- all offspring are identical
- it is quicker
Answer: B) variation, helping populations adapt to change
Explanation: Variation allows adaptation. O Level Biology · Topic 16 Development of Organisms and Continuity of Life · 16.2 Asexual and sexual reproduction
12. Which hormone maintains the lining of the uterus?
- LH
- Progesterone
- Testosterone
- FSH
Answer: B) Progesterone
Explanation: Progesterone keeps the lining thick. O Level Biology · Topic 16 Development of Organisms and Continuity of Life · 16.4 Sexual reproduction in humans
13. Which conditions are needed for germination?
- Water, oxygen and a suitable temperature
- Oxygen and light only
- Light, water and carbon dioxide
- Light and soil
Answer: A) Water, oxygen and a suitable temperature
Explanation: Light is not needed for germination. O Level Biology · Topic 16 Development of Organisms and Continuity of Life · 16.3 Sexual reproduction in plants
14. After fertilisation the zygote divides to form an embryo which
- implants in the lining of the uterus
- attaches to the cervix
- stays in the oviduct
- travels to the ovary
Answer: A) implants in the lining of the uterus
Explanation: Implantation occurs in the uterus lining. O Level Biology · Topic 16 Development of Organisms and Continuity of Life · 16.4 Sexual reproduction in humans
15. Meiosis is described as a reduction division because
- the chromosome number is halved
- cells become smaller
- it produces fewer cells
- it reduces growth
Answer: A) the chromosome number is halved
Explanation: Diploid → haploid. O Level Biology · Topic 16 Development of Organisms and Continuity of Life · 16.1 Nuclear division
16. Cancer results from
- too few mitochondria
- meiosis
- lack of vitamins
- uncontrolled cell division
Answer: D) uncontrolled cell division
Explanation: Tumours form from uncontrolled mitosis. O Level Biology · Topic 16 Development of Organisms and Continuity of Life · 16.1 Nuclear division
17. Why is it an advantage for seeds to be dispersed?
- It makes seeds bigger
- It reduces competition with the parent plant
- It makes pollen
- It stops germination
Answer: B) It reduces competition with the parent plant
Explanation: Spreading out reduces competition and colonises new areas. O Level Biology · Topic 16 Development of Organisms and Continuity of Life · 16.3 Sexual reproduction in plants
18. Stem cells are
- specialised nerve cells
- unspecialised cells that can divide and become specialised
- dead cells
- cells that only make sperm
Answer: B) unspecialised cells that can divide and become specialised
Explanation: Definition of stem cells. O Level Biology · Topic 16 Development of Organisms and Continuity of Life · 16.1 Nuclear division
19. A fruit with hooks is dispersed by
- wind
- water
- animals
- explosion
Answer: C) animals
Explanation: Hooks catch on animal fur. O Level Biology · Topic 16 Development of Organisms and Continuity of Life · 16.3 Sexual reproduction in plants
20. Mitosis produces
- gametes
- four cells with half the chromosomes
- genetically different haploid cells
- genetically identical cells with the same chromosome number
Answer: D) genetically identical cells with the same chromosome number
Explanation: Mitosis maintains chromosome number. O Level Biology · Topic 16 Development of Organisms and Continuity of Life · 16.1 Nuclear division
21. Pollination is the
- fusion of male and female nuclei
- growth of a seed
- dispersal of fruits
- transfer of pollen from an anther to a stigma
Answer: D) transfer of pollen from an anther to a stigma
Explanation: Definition of pollination. O Level Biology · Topic 16 Development of Organisms and Continuity of Life · 16.3 Sexual reproduction in plants
22. Where does fertilisation normally take place?
- Oviduct
- Ovary
- Cervix
- Uterus
Answer: A) Oviduct
Explanation: Sperm meet the egg in the oviduct. O Level Biology · Topic 16 Development of Organisms and Continuity of Life · 16.4 Sexual reproduction in humans
23. Which is an example of asexual reproduction?
- Pollination
- Potato tubers
- Fertilisation of an egg
- Seed formation after cross-pollination
Answer: B) Potato tubers
Explanation: Tubers grow new identical plants. O Level Biology · Topic 16 Development of Organisms and Continuity of Life · 16.2 Asexual and sexual reproduction
24. Why do sperm cells have many mitochondria?
- To make enzymes
- To fertilise more eggs
- To release energy for swimming
- To store food
Answer: C) To release energy for swimming
Explanation: Mitochondria power the flagellum. O Level Biology · Topic 16 Development of Organisms and Continuity of Life · 16.4 Sexual reproduction in humans
25. Secondary sexual characteristics in boys are controlled by
- oestrogen
- testosterone
- insulin
- FSH
Answer: B) testosterone
Explanation: Testosterone acts at puberty. O Level Biology · Topic 16 Development of Organisms and Continuity of Life · 16.4 Sexual reproduction in humans
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