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📘 Study MCQs
Q1. What is binary fission?
• Division of one cell into two equal cells
• Fusion of two cells
• Formation of seeds
• Laying of eggs
Answer: Division of one cell into two equal cells
Binary fission is a type of asexual reproduction in which one parent cell divides into two identical daughter cells. It is common in single-celled organisms like Amoeba and bacteria. This process helps in rapid multiplication.
Q2. Which organism reproduces mainly by binary fission?
• Amoeba
• Cow
• Human
• Hen
Answer: Amoeba
Amoeba is a single-celled organism that reproduces by dividing itself into two parts. Each new cell becomes a complete Amoeba. This is a fast and simple method of reproduction.
Q3. How many new cells are formed in binary fission?
• One
• Two
• Three
• Four
Answer: Two
In binary fission, one parent cell splits into two daughter cells. Both cells are identical to the parent. This increases the number of organisms quickly.
Q4. Which part of the cell divides first in binary fission?
• Nucleus
• Cell wall
• Membrane
• Cytoplasm
Answer: Nucleus
During binary fission, the nucleus divides first. After that, the cytoplasm splits and forms two separate cells. Each new cell receives one nucleus.
Q5. Binary fission is a type of which reproduction?
• Sexual reproduction
• Asexual reproduction
• External fertilisation
• Internal fertilisation
Answer: Asexual reproduction
Binary fission needs only one parent and no gametes. The offspring produced are exactly like the parent. That is why it is called asexual reproduction.
Q6. Which condition helps binary fission happen faster?
• Plenty of food and warmth
• Cold weather
• Lack of food
• Darkness
Answer: Plenty of food and warmth
Binary fission happens quickly when conditions are suitable. Enough food, warmth, and moisture help the organism grow and divide faster. Unfavourable conditions slow down the process.
Q7. The two cells formed in binary fission are called what?
• Gametes
• Daughter cells
• Seeds
• Embryos
Answer: Daughter cells
The new cells formed after division are called daughter cells. They are genetically identical to the parent cell. Each can grow and divide again.
Q8. Which of the following also reproduces by binary fission?
• Bacteria
• Dog
• Cat
• Frog
Answer: Bacteria
Many bacteria reproduce by binary fission. This allows them to increase in number very rapidly. Sometimes millions of bacteria form in a short time.
Q9. What is a foetus?
• A fertilised egg
• A developing baby inside the uterus
• A sperm cell
• A plant seed
Answer: A developing baby inside the uterus
A foetus is the stage of a developing baby after the embryo stage. Body parts are formed and start functioning. It continues growing until birth.
Q10. The foetus develops inside which organ?
• Heart
• Uterus
• Kidney
• Lungs
Answer: Uterus
The foetus grows and develops inside the uterus of the mother. The uterus protects and nourishes it. It provides a safe environment for growth.
Q11. Which stage comes before the foetus?
• Embryo
• Baby
• Adult
• Egg
Answer: Embryo
The embryo stage comes before the foetus. After some weeks, the embryo develops into a foetus. This stage shows further development of body organs.
Q12. How long does a human foetus develop before birth?
• About 9 months
• 2 weeks
• 1 month
• 2 years
Answer: About 9 months
A human foetus develops in the uterus for about 9 months. During this time, all organs grow and mature. Finally, the baby is ready for birth.
Q13. Which stage shows movement of the baby inside the womb?
• Foetus
• Zygote
• Egg
• Spore
Answer: Foetus
During the foetus stage, the baby starts moving inside the uterus. The mother can feel these movements after some months. It is a sign of healthy development.
Q14. What develops first in the foetus?
• Heart and brain
• Hair and nails
• Teeth
• Clothes
Answer: Heart and brain
In early foetal development, vital organs like the heart and brain begin forming first. These organs are necessary for survival. Other parts develop later.
Q15. What protects the foetus inside the uterus?
• Amniotic fluid
• Bones
• Skin
• Air
Answer: Amniotic fluid
The foetus is surrounded by amniotic fluid. It protects the baby from shocks and keeps it safe. It also helps in proper growth.
Q16. What are sperms?
• Male reproductive cells
• Female reproductive cells
• Plant seeds
• Baby cells
Answer: Male reproductive cells
Sperms are male gametes produced in the testes. They are very small and can move with the help of a tail. They join with the egg to form a zygote.
Q17. Where are sperms produced in humans?
• Ovary
• Testes
• Uterus
• Kidney
Answer: Testes
The testes are male reproductive organs that produce sperms. Millions of sperms are formed every day. They are necessary for fertilisation.
Q18. Why can sperms move?
• They have a tail
• They have wings
• They have legs
• They have roots
Answer: They have a tail
Sperms have a long tail that helps them swim. This helps them reach the egg for fertilisation. Movement is important for reproduction.
Q19. What is the main function of sperms?
• To carry male genetic material
• To make food
• To form blood
• To grow hair
Answer: To carry male genetic material
Sperms carry the father’s genetic information. When they meet the egg, they form a zygote. This begins the development of a new baby.
Q20. How many sperms are needed to fertilise one egg?
• One
• Ten
• Hundred
• Thousand
Answer: One
Only one sperm enters and fertilises the egg. After one sperm enters, the egg blocks others. This ensures proper development.
Q21. What are eggs in humans called?
• Female reproductive cells
• Male cells
• Seeds
• Spores
Answer: Female reproductive cells
Eggs are female gametes produced in the ovaries. They contain the mother’s genetic information. They join with sperms during fertilisation.
Q22. Where are eggs produced?
• Testes
• Ovaries
• Heart
• Liver
Answer: Ovaries
Ovaries are female reproductive organs that produce eggs. Usually one egg is released every month. This is part of the reproductive cycle.
Q23. What happens when sperm meets egg?
• Fertilisation occurs
• The egg breaks
• The sperm disappears
• Nothing happens
Answer: Fertilisation occurs
When sperm fuses with egg, fertilisation takes place. A zygote is formed. This is the first step in baby development.
Q24. Which is larger in size?
• Egg
• Sperm
• Both same
• None
Answer: Egg
The egg is much larger than the sperm. It contains stored food for the early development of the embryo. The sperm is very small and mobile.
Q25. Which of the following carries nutrients for early growth?
• Egg
• Sperm
• Hair
• Skin
Answer: Egg
The egg contains stored nutrients. These help the embryo grow in the early stages. The sperm mainly carries genetic information.
Q26. Which process forms a zygote?
• Fertilisation
• Binary fission
• Budding
• Cloning
Answer: Fertilisation
Fertilisation happens when sperm and egg join together. This forms a zygote. The zygote later grows into an embryo and foetus.
Q27. Which cell has a tail?
• Sperm
• Egg
• Foetus
• Embryo
Answer: Sperm
The sperm has a tail that helps it swim toward the egg. This movement is necessary for fertilisation. Eggs do not move like sperms.
Q28. Which stage comes after fertilisation?
• Zygote
• Foetus
• Adult
• Seed
Answer: Zygote
After fertilisation, the zygote is formed. It is the first cell of the new individual. It divides to form an embryo.
Q29. Why is binary fission important for microorganisms?
• Helps them multiply quickly
• Helps them sleep
• Helps them move
• Helps them eat
Answer: Helps them multiply quickly
Binary fission allows microorganisms to increase their number fast. This helps them survive and spread easily. It is their main method of reproduction.
Q30. Which stage shows growth of fingers and toes?
• Foetus
• Zygote
• Egg
• Sperm
Answer: Foetus
During the foetus stage, body parts like fingers and toes develop clearly. Organs become more complete. The baby starts looking like a human.
Q31. Which cell is formed by joining sperm and egg?
• Zygote
• Embryo
• Foetus
• Baby
Answer: Zygote
The fusion of sperm and egg forms a zygote. It carries genes from both parents. This is the beginning of a new life.
Q32. Which of these has genetic material from both parents?
• Zygote
• Sperm
• Egg
• Foetus only
Answer: Zygote
The zygote contains genetic information from both mother and father. This decides the baby’s features. It later grows into an embryo.
Q33. Can binary fission occur in humans?
• No
• Yes
• Sometimes
• Only in babies
Answer: No
Binary fission happens only in single-celled organisms. Humans reproduce by sexual reproduction. Human cells divide for growth, not for reproduction like Amoeba.
Q34. What helps sperm reach the egg?
• Its tail movement
• Its size
• Its colour
• Its shape only
Answer: Its tail movement
The tail helps the sperm swim through fluids. This movement helps it reach the egg. Without movement, fertilisation cannot occur.
Q35. Which stage is the longest in baby development?
• Foetus
• Zygote
• Egg
• Sperm
Answer: Foetus
The foetus stage lasts several months. Most growth and development occur during this time. The baby prepares for birth.
Q36. How many eggs are usually released at a time in humans?
• One
• Ten
• Hundred
• Many
Answer: One
Usually one egg is released from the ovary each month. This is part of the female reproductive cycle. Sometimes more than one egg may be released.
Q37. Which cell provides half of the genetic information?
• Sperm
• Skin
• Hair
• Blood
Answer: Sperm
The sperm carries half of the genetic material from the father. The egg carries the other half from the mother. Together they form a complete set.
Q38. Which part of sperm carries genetic material?
• Head
• Tail
• Middle part
• Skin
Answer: Head
The head of the sperm contains the nucleus. This holds the genetic information. It joins with the egg nucleus during fertilisation.
Q39. Why is the egg important in reproduction?
• It provides nutrients and genes
• It helps in breathing
• It moves fast
• It divides quickly
Answer: It provides nutrients and genes
The egg contains stored food and genetic material. It supports the early growth of the embryo. It plays a major role in development.
Q40. What happens to the foetus before birth?
• It grows fully
• It divides into two
• It becomes an egg
• It disappears
Answer: It grows fully
Before birth, the foetus grows in size and its organs mature. It becomes ready to live outside the womb. This stage completes development.
Q41. Which of these is a microscopic organism?
• Amoeba
• Elephant
• Dog
• Tiger
Answer: Amoeba
Amoeba is so small that it can be seen only under a microscope. It reproduces by binary fission. It lives in water and moist places.
Q42. Why are sperms produced in large numbers?
• To increase chances of fertilisation
• To make food
• To protect the body
• To grow faster
Answer: To increase chances of fertilisation
Many sperms are released so that at least one can reach the egg. This increases the chances of fertilisation. Only one sperm is needed to form a zygote.
Q43. Which is an example of asexual reproduction?
• Binary fission
• Fertilisation
• Egg laying
• Birth in humans
Answer: Binary fission
Binary fission does not need two parents. One organism divides into two. This is a common form of asexual reproduction.
Q44. What is the smallest reproductive cell in humans?
• Sperm
• Egg
• Foetus
• Embryo
Answer: Sperm
The sperm cell is very tiny compared to the egg. It is specially designed to swim and reach the egg. It carries the father’s genetic material.
Q45. Which cell is round in shape?
• Egg
• Sperm
• Foetus
• Embryo
Answer: Egg
The egg is round and larger in size. It stays in one place and waits for fertilisation. It contains stored nutrients.
Q46. Which stage comes after the zygote?
• Embryo
• Foetus
• Adult
• Egg
Answer: Embryo
After formation, the zygote divides to form an embryo. This stage shows the beginning of body part formation. It later becomes a foetus.
Q47. What happens if fertilisation does not occur?
• No baby is formed
• Two babies are formed
• Binary fission starts
• Cloning happens
Answer: No baby is formed
Fertilisation is necessary to form a zygote. Without it, development of a baby cannot begin. The egg is released from the body later.
Q48. Which is necessary to form a new human life?
• Sperm and egg
• Binary fission
• Spores
• Seeds
Answer: Sperm and egg
Both sperm and egg are needed for fertilisation. They combine to form a zygote. This starts the process of human development.
Q49. Which stage shows maximum growth of body size?
• Foetus
• Zygote
• Sperm
• Egg
Answer: Foetus
During the foetus stage, the baby grows rapidly in size. Organs develop and become strong. This stage prepares the baby for birth.
Q50. Which of these is NOT involved in binary fission?
• Nucleus division
• Cell splitting
• Two parent cells
• Formation of daughter cells
Answer: Two parent cells
Binary fission involves only one parent cell. It divides into two daughter cells. No second parent is needed in this process.