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Class 10  »  Biology  »  How Do Organisms Reproduce

Fertilisation and Embryo Development_Unsolved Paper

Class 10

Chapter: How Do Organisms Reproduce | Topic: Fertilisation and Embryo Development

Unsolved Paper
Study Material.
Class 10

FERTILISATION AND EMBRYO DEVELOPMENT_UNSOLVED PAPER

Topic: Fertilisation and Embryo Development

Time: 90 mins | Marks: 45 | Difficulty: Medium
multiple choice question

Q1. Fertilisation in humans occurs when: 

  1. An ovum is released from the ovary
  2. A sperm fuses with an ovum
  3. The embryo attaches to the uterus
  4. The uterine lining is shed

Q2. The cell formed immediately after fertilisation is called the:

  1. Embryo
  2. Foetus
  3. Zygote
  4. Ovum

Q3. After fertilisation, the zygote begins to:

  1. Produce sperm
  2. Divide repeatedly
  3. Leave the body immediately
  4. Form a new ovum

Q4. The developing embryo becomes attached to the:

  1. Ovary
  2. Uterine lining
  3. Vagina
  4. Oviduct wall only

Q5.Which structure provides a connection between the developing embryo and the mother's body for exchange of materials?

  1. Placenta
  2. Ovary
  3. Cervix
  4. Urethra

Q6. Which sequence correctly represents early human development?

  1. Fertilisation --> Zygote --> Cell division --> Embryo --> Implantation
  2. Implantation --> Fertilisation --> Zygote --> Embryo
  3. Zygote --> Fertilisation --> Implantation --> Ovulation
  4. Embryo --> Zygote --> Fertilisation --> Implantation

Short questions

Q1. What is fertilisation in humans? Where does it normally occur in the female reproductive system?

Q2. What is a zygote? How is it formed?

Q3. What happens to the zygote after fertilisation?

Q4. What is implantation? Why is it important for embryo development?

Q5. 

During a biology lesson, a student compares a single-cell zygote with a developing embryo.

Why does the embryo contain many more cells than the original zygote?

Q6. 

During a biology lesson, a student compares a single-cell zygote with a developing embryo.

Why does the embryo contain many more cells than the original zygote?

long questions

Q1. Describe the events that occur from fertilisation to implantation. Include the formation of the zygote, repeated cell division, movement towards the uterus, and attachment to the uterine lining.

Q2. Explain how the embryo develops after implantation. Discuss the importance of the uterus, placenta, and umbilical connection in supporting the developing embryo.

Q3. A couple learns that pregnancy has begun after fertilisation and implantation. Explain how the developing embryo receives food and oxygen and how waste materials are removed during development. Also explain the role of the placenta in this process.

application-based questions

Q1. 

A student writes these events in random order:

  1. Implantation

  2. Fertilisation

  3. Zygote formation

  4. Repeated cell division

  5. Embryo development

Arrange the events in their correct sequence.

Q2. 

A fertilised egg begins dividing normally but fails to become properly attached to the uterine lining.

a) Which stage of reproduction has been affected?
b) Why is proper attachment to the uterine lining important for further development?

Q3. 

Consider two developing embryos:

  • Embryo A: Has a properly functioning placenta.

  • Embryo B: Does not receive adequate exchange of nutrients and oxygen through the placenta.

Compare how the development of the two embryos may be affected and explain why the placenta is important.

Total: 45 Marks | Time: 90 mins

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