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📘 Study MCQs
Q1. What is the first stage in the development of a baby after fertilisation?
• Embryo
• Zygote
• Foetus
• Infant
Answer: Zygote
The zygote is formed when the sperm and egg fuse during fertilisation. It is a single cell that divides many times to form an embryo. This stage marks the beginning of a new life.
Q2. What does the zygote develop into next?
• Seed
• Embryo
• Adult
• Spore
Answer: Embryo
The zygote divides repeatedly and forms an embryo. The embryo is the early stage where basic body parts begin to form. It later develops into a foetus.
Q3. What is an embryo?
• A fully grown baby
• An early stage of development
• A type of cell only in plants
• A reproductive organ
Answer: An early stage of development
An embryo is the early developing stage of a baby inside the uterus. During this stage, important organs like the brain and heart start forming. It is a very delicate stage of development.
Q4. What is the stage after embryo called in humans?
• Foetus
• Zygote
• Egg
• Spore
Answer: Foetus
After a few weeks, the embryo grows into a foetus. In this stage, body parts become more developed and begin to function. The foetus continues growing until birth.
Q5. Where does the embryo develop in humans?
• Heart
• Uterus
• Kidney
• Liver
Answer: Uterus
The embryo develops inside the uterus of the mother. The uterus provides protection and nutrients for growth. It is the safest place for the baby to develop.
Q6. Which stage comes just before birth?
• Zygote
• Embryo
• Foetus
• Cell
Answer: Foetus
The foetus is the final stage of development before birth. At this stage, most body parts are fully formed. The baby continues to grow in size and strength.
Q7. Which organism reproduces by budding?
• Hydra
• Dog
• Cat
• Cow
Answer: Hydra
Hydra is a simple water animal that reproduces by budding. A small outgrowth appears on its body and grows into a new Hydra. This process needs only one parent.
Q8. What is budding in Hydra?
• Formation of seeds
• Growth of a new individual from a small outgrowth
• Breaking into pieces
• Egg laying
Answer: Growth of a new individual from a small outgrowth
In budding, a small bump called a bud forms on the parent Hydra. It grows slowly and develops tentacles. Later, it separates and lives independently.
Q9. Which type of reproduction is budding?
• Sexual reproduction
• Asexual reproduction
• Pollination
• Fertilisation
Answer: Asexual reproduction
Budding involves only one parent and no fusion of cells. The new organism formed is exactly like the parent. This makes it a type of asexual reproduction.
Q10. What happens to the bud in Hydra after it grows fully?
• It falls off and dies
• It separates and lives independently
• It becomes a flower
• It becomes a root
Answer: It separates and lives independently
Once the bud is fully grown, it detaches from the parent body. It starts living on its own as a new Hydra. This increases the number of Hydra quickly.
Q11. Which process is used by Amoeba to reproduce?
• Budding
• Binary fission
• Pollination
• Fertilisation
Answer: Binary fission
Amoeba reproduces by binary fission, where one cell splits into two. This is a fast and simple method of reproduction. Each new cell grows into a complete Amoeba.
Q12. What is binary fission?
• Fusion of two cells
• Division of one cell into two
• Formation of seeds
• Growth of roots
Answer: Division of one cell into two
In binary fission, the parent cell divides into two equal parts. First the nucleus divides, then the whole cell splits. Each part becomes a new organism.
Q13. Which organism reproduces by binary fission?
• Hydra
• Amoeba
• Cow
• Human
Answer: Amoeba
Amoeba is a single-celled organism that reproduces by splitting itself. This process happens quickly under suitable conditions. It produces identical offspring.
Q14. In binary fission, how many new cells are formed?
• One
• Two
• Three
• Four
Answer: Two
One parent cell divides into two daughter cells in binary fission. These two cells are identical to the parent. This helps rapid increase in number.
Q15. What happens to the nucleus in binary fission?
• It disappears
• It divides into two
• It becomes a seed
• It grows bigger
Answer: It divides into two
During binary fission, the nucleus splits into two first. Then the cytoplasm divides to form two new cells. Each cell gets one nucleus.
Q16. Who was Dolly?
• A plant
• A cloned sheep
• A bird
• A fish
Answer: A cloned sheep
Dolly was the first sheep made by cloning from an adult cell. She was born in 1996 and became famous worldwide. It showed that animals can be copied scientifically.
Q17. Why is Dolly famous?
• First cloned animal
• First egg-laying sheep
• First plant clone
• First fish clone
Answer: First cloned animal
Dolly was the first mammal successfully cloned from a body cell. This was a big achievement in science. It helped in studying genetics and medical research.
Q18. What does cloning mean?
• Making identical copies
• Making seeds
• Growing plants
• Fertilisation
Answer: Making identical copies
Cloning is the process of producing an exact copy of an organism. The clone has the same genes as the original. It is a type of artificial reproduction.
Q19. Dolly was cloned in which country?
• India
• Scotland
• USA
• China
Answer: Scotland
Dolly was created by scientists in Scotland. She was made at the Roslin Institute. This discovery became a major milestone in science.
Q20. Dolly was a clone of which animal?
• Goat
• Cow
• Sheep
• Dog
Answer: Sheep
Dolly was a cloned sheep made using a cell from another sheep. She looked exactly like the sheep from which the cell was taken. This proved cloning was possible in mammals.
Q21. What type of reproduction is cloning similar to?
• Sexual reproduction
• Asexual reproduction
• Pollination
• Fertilisation
Answer: Asexual reproduction
Cloning produces an identical copy from one parent only. No fusion of male and female cells happens. That is why it is similar to asexual reproduction.
Q22. What is external fertilisation?
• Fertilisation inside the body
• Fertilisation outside the body
• Fertilisation in plants only
• No fertilisation
Answer: Fertilisation outside the body
External fertilisation happens when sperm and egg meet outside the female body. It usually occurs in water. This method is common in fish and frogs.
Q23. Which animals show external fertilisation?
• Fish
• Dog
• Cat
• Human
Answer: Fish
Fish release eggs and sperms into water. Fertilisation takes place outside the body. This increases the chances of reproduction in aquatic life.
Q24. Which animal shows external fertilisation in water?
• Frog
• Cow
• Goat
• Horse
Answer: Frog
Frogs lay eggs in water and the male releases sperms over them. Fertilisation occurs outside the body. This is called external fertilisation.
Q25. Where does external fertilisation usually take place?
• In air
• In water
• In soil
• In leaves
Answer: In water
External fertilisation mostly takes place in water because sperms can swim easily. Water prevents eggs from drying. It supports the meeting of gametes.
Q26. Which stage develops after the foetus?
• Baby
• Embryo
• Zygote
• Egg
Answer: Baby
After completing development as a foetus, the baby is born. This marks the end of the development process inside the uterus. The baby then grows outside the body.
Q27. Which stage comes first: embryo or foetus?
• Foetus
• Embryo
• Both together
• None
Answer: Embryo
The embryo forms first from the zygote. After some weeks, it changes into a foetus. Each stage shows further growth and development.
Q28. Which process involves only one parent cell dividing?
• Binary fission
• Fertilisation
• Pollination
• IVF
Answer: Binary fission
In binary fission, a single parent cell divides into two. No second parent is needed. It is a simple and quick method of reproduction.
Q29. Which organism shows both sexual and asexual reproduction?
• Hydra
• Amoeba
• Fish
• Cow
Answer: Hydra
Hydra can reproduce by budding (asexual) and also by sexual reproduction. This helps it survive in different conditions. It increases chances of survival.
Q30. What grows on Hydra during budding?
• Seed
• Bud
• Leaf
• Root
Answer: Bud
A small bud forms on the side of Hydra’s body. It grows slowly and develops into a complete organism. Later, it detaches from the parent.
Q31. Which part of the Amoeba divides during binary fission?
• Nucleus
• Leaf
• Stem
• Root
Answer: Nucleus
The nucleus controls the activities of the cell. During binary fission, it divides first into two. Then the cell splits into two new Amoebas.
Q32. What is the main aim of cloning?
• To make identical organisms
• To make seeds
• To grow plants
• To lay eggs
Answer: To make identical organisms
Cloning helps produce organisms with the same features as the parent. It is used in research and farming. Scientists study diseases using cloned animals.
Q33. Which stage is the smallest in baby development?
• Zygote
• Foetus
• Baby
• Adult
Answer: Zygote
The zygote is just a single cell and is very tiny. It grows by dividing many times. It is the starting point of life.
Q34. Which stage shows development of body parts?
• Embryo
• Zygote
• Seed
• Spore
Answer: Embryo
During the embryo stage, organs like the heart and brain begin to form. It is an important stage of development. The body shape also starts forming.
Q35. Which method is faster: budding or sexual reproduction?
• Budding
• Sexual reproduction
• Both same
• None
Answer: Budding
Budding is faster because it involves only one parent. It does not need fertilisation. Many new organisms can be formed quickly.
Q36. What is the result of budding?
• Two identical organisms
• Seeds
• Eggs
• Spores
Answer: Two identical organisms
Budding produces a new organism that looks exactly like the parent. It carries the same genetic material. This helps in rapid multiplication.
Q37. What is the main feature of binary fission?
• Two parents involved
• One parent divides into two
• Seeds are formed
• Eggs are laid
Answer: One parent divides into two
Binary fission involves the splitting of one parent cell. It produces two identical daughter cells. This is common in single-celled organisms.
Q38. What do we call the developing baby inside the uterus after some weeks?
• Zygote
• Embryo
• Foetus
• Seed
Answer: Foetus
After some time, the embryo grows into a foetus. Body parts become clearly visible. The foetus continues to grow until birth.
Q39. Which stage lasts for the longest time in baby development?
• Zygote
• Embryo
• Foetus
• Cell
Answer: Foetus
The foetus stage continues for several months. During this time, the baby grows in size and strength. Organs become fully developed.
Q40. Which scientist’s work led to the creation of Dolly?
• Cloning scientists
• Farmers
• Doctors
• Teachers
Answer: Cloning scientists
A team of scientists worked together to clone Dolly. They used a body cell from an adult sheep. This showed that cloning was possible in mammals.
Q41. What is needed for external fertilisation?
• Water
• Soil
• Air only
• Sunlight
Answer: Water
Water allows sperms to move easily toward eggs. It also protects eggs from drying. That is why most animals with external fertilisation live in water.
Q42. Which is an example of asexual reproduction?
• Budding in Hydra
• Birth in humans
• Seed formation
• Egg laying in birds
Answer: Budding in Hydra
Budding uses only one parent and does not involve gametes. The new organism formed is identical. It is a simple and natural process.
Q43. Which cell division helps in binary fission?
• Cell splitting
• Pollination
• Fertilisation
• Cloning
Answer: Cell splitting
Binary fission happens by splitting of one cell into two. First the nucleus divides, then the cytoplasm. Each new cell becomes a separate organism.
Q44. What happens to the embryo with time?
• It becomes a foetus
• It disappears
• It becomes a seed
• It becomes a root
Answer: It becomes a foetus
As the embryo grows, it develops into a foetus. Body parts become more complete. This stage prepares the baby for birth.
Q45. Which stage shows heartbeat in developing baby?
• Foetus
• Zygote
• Egg
• Spore
Answer: Foetus
In the foetus stage, the heart starts beating and organs function. Movement can also begin. It shows active growth and development.
Q46. Which organism divides into two by binary fission?
• Amoeba
• Hydra
• Dog
• Human
Answer: Amoeba
Amoeba reproduces by dividing into two equal parts. Each part grows into a complete organism. This is a common method in microscopic organisms.
Q47. What is the final stage of baby development before birth?
• Embryo
• Foetus
• Zygote
• Egg
Answer: Foetus
The foetus is the last stage before birth. The baby becomes fully formed and gains weight. It remains in the uterus until ready for delivery.
Q48. What type of offspring is produced in binary fission?
• Different
• Identical
• Hybrid
• New species
Answer: Identical
Binary fission produces offspring that are exactly like the parent. They have the same genetic material. This ensures fast multiplication.
Q49. Which process produces many organisms quickly?
• Binary fission
• Sexual reproduction
• Pollination
• Fertilisation
Answer: Binary fission
Binary fission happens quickly and repeatedly. One cell becomes two, then four, and so on. This leads to rapid increase in number.
Q50. Which is the correct order of baby development?
• Zygote → Embryo → Foetus → Baby
• Embryo → Zygote → Baby → Foetus
• Foetus → Embryo → Zygote → Baby
• Baby → Zygote → Embryo → Foetus
Answer: Zygote → Embryo → Foetus → Baby
The correct order starts from zygote, then embryo, then foetus, and finally baby. Each stage shows more growth and development. This process takes about 9 months in humans.