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All questions of How do Organisms Reproduce? for Class 10 Exam

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Asexual reproduction is good because it:
  • a)
    Involves two parents
  • b)
    Is simple and fast
  • c)
    Shows no variation
  • d)
    Produces defect in offspring
Correct answer is option 'B'. Can you explain this answer?

Anjana Khatri answered
Asexual reproduction occurs when an organism makes more of itself without exchanging genetic information with another organism through sex.In sexually reproducing organisms, the genomes of two parents are combined to create offspring with unique genetic profiles. This is beneficial to the population because genetically diverse populations have a higher chance of withstanding survival challenges such as disease and environmental changes.

Asexually reproducing organisms can suffer a dangerous lack of diversity – but they can also reproduce faster than sexually reproducing organisms, and a single individual can found a new population without the need for a mate.

Which part of seed on germination develops into shoot?
  • a)
    Funicle
  • b)
    Cotyledon
  • c)
    Radicle
  • d)
    Plumule
Correct answer is option 'D'. Can you explain this answer?

Rahul Kapoor answered
In plant physiology, the epicotyl is the embryonic shoot above the cotyledons. In most plants theepicotyl will eventually develop into the leaves of the plant. In dicots, the hypocotyl is what appears to be the base stem under the spent withered cotyledons, and the shoot just above that is theepicotyl.
Which is commonly called as plumule , which forms shoot parts And radicle forms root parts.

New plants can be produces without the help of any reproductive organ by:
  • a)
    Vegetative propagation
  • b)
    Regeneration
  • c)
    Budding
  • d)
    Fragmentation
Correct answer is option 'A'. Can you explain this answer?

Mahi Ashta. answered
Ofcourse....A is rytt....as vegetative propagation is...an artificial method of.... reproduction in..which the nodes ..of one...plant attached with internodes of other ...plant as not ...of the same plant...

Human beings are more genetically advanced than monkey because of:
  • a)
    Fragmentation
  • b)
    Reproduction
  • c)
    Budding
  • d)
    Variation
Correct answer is option 'D'. Can you explain this answer?

Rajiv Gupta answered
Human variability refers to the fact that there is a range of possible values for each of the numerous physical and mental characteristics of human beings. Fundamental Characteristic. Variation is, in fact, inherent in every living species.

A benefit of plant grown by vegetative propagation is :
  • a)
    Lose vigor
  • b)
    Less adaptability to environment
  • c)
    Better quality can be maintained
  • d)
    Induces overcrowding
Correct answer is option 'C'. Can you explain this answer?

Rohan Kapoor answered
Vegetative propagation is a type of asexual reproduction in plants which produces new organisms and does not involve the production of seeds or spores. It can be natural or can be induced. This type of reproduction is common to have desirable characteristics in a particular group of plants. Vegetative propagation is preferred to sexual reproduction for many reasons but mostly it preferred as it is an easy process and is a faster way to propagation of certain plants. In this method of artificial reproduction there are more amounts of clone produced and is better quality than the actual seedlings. 

Advantage of Vegetative Propagation
The main advantage of vegetative propagation methods is that the new plants contain the genetic material of only one parent, so they are essentially clones of the parent plant. This means that, once you have a plant with desirable traits, you can reproduce the same traits indefinitely, as long as the growing conditions remain similar. This is especially important for commercial growers who want to reproduce the highest-quality plants and ensure consistency of a variety of plant or crop for sale. This can also help to maintain consistent quality and taste in products made from plants or crops. For example, in Zealong’s tea plantation, they propagate new tea plants using cuttings to ensure consistency in the taste and quality of their tea.

Variation in organisms is due to:
  • a)
    Cloning
  • b)
    Body design
  • c)
    Fusions of gametes
  • d)
    Multiplication
Correct answer is option 'C'. Can you explain this answer?

Indu Gupta answered
When gametes of two parents fuse together it results in variations. Variation is due to change in the structure of DNA.

Organism look similar because of similar:
  • a)
    Nuclei
  • b)
    Ears
  • c)
    Body design
  • d)
    Eyes
Correct answer is option 'C'. Can you explain this answer?

Ananya Das answered
Organisms look similar because their body designs are similar. If body designs are to be similar , the blueprints for these designs should be similar.

Which of the following plant has unisexual flowers?
  • a)
    Hibiscus
  • b)
    Mustard
  • c)
    Papaya
  • d)
    Pansy
Correct answer is option 'C'. Can you explain this answer?

Ananya Das answered
Papaya has Unisexual flowers ie., make flowers and female flowers are on separate plants. So, the correct answer is papaya.

Reproduction is important as it allows:
  • a)
    Loss of vigour
  • b)
    Sterility in organism
  • c)
    Perpetuation of species
  • d)
    Defects in offspring
Correct answer is option 'C'. Can you explain this answer?

Gaurav Kumar answered
The main significance of reproduction is to maintain continuity of species. It also helps in studying evolution as sexual reproduction results in variation among the species.

Which of the following is capable of producing a new plant?
  • a)
    Germ cell
  • b)
    Pollen grain
  • c)
    Ovule
  • d)
    Seed
Correct answer is option 'D'. Can you explain this answer?

Anjana Khatri answered
The primary function of seeds is reproduction in which plants perpetuate themselves, mainly sexually. The seed is widely used in the deliberate production of seedlings, known as plant propagation. In addition, this organ also serves as a diaspore or dispersal unit of many plants.

In case the ova does not fertilise, which of the following events will take place?
  • a)
    Menstruation
  • b)
    Pregnancy
  • c)
    Implantation
  • d)
    Ovulation
Correct answer is option 'A'. Can you explain this answer?

Poorvi.m. Singh answered
Option a is right answer because .....the wall of uterus will thicken to recieve the fertilized egg in case of no fertilisation....the thickened lining of uterus along with some blood vessels shud off....which is known as menstruation

Which of the following is the correct sequence of events of sexual reproduction in a flower?

  • a)
    pollination, fertilisation, seedling, embryo
  • b)
    seedling, embryo, fertilisation, pollination
  • c)
    pollination, fertilisation, embryo, seedling
  • d)
    embryo, seedling, pollination, fertilisation
Correct answer is option 'C'. Can you explain this answer?

Vikas Kumar answered
Sexual reproduction in flowering plants involves the production of male and female gametes, the transfer of the male gametes to the female ovules in a process called pollination. After pollination occurs, fertilization happens and the ovules grow into seeds within a fruit.

Development of offsprings identical to their parents is the result of:
  • a)
    Fertilization
  • b)
    Pollination
  • c)
    Asexual reproduction
  • d)
    Sexual reproduction
Correct answer is option 'C'. Can you explain this answer?

Vikas Kumar answered
Asexual reproduction involves a single parent. It results in offspring that are genetically identical to each other and to the parent. All prokaryotes and some eukaryotes reproduce this way.  Binary fission occurs when a parent cell splits into two identical daughter cells of the same size.

In the list of organisms given below, those that reproduce by the asexual method are
(i) banana
(ii) dog
(iii) yeast
(iv) Amoeba
  • a)
    (ii) and (iv)
  • b)
    (i), (iii) and (iv)
  • c)
    (i) and (iv)
  • d)
    (ii), (iii) and (iv)
Correct answer is option 'B'. Can you explain this answer?

Amit Sharma answered
Asexual reproduction is the mode of reproduction in single parent produces offsprings. Amoeba reproduces asexually by binary fission. Asexual reproduction occurs in yeast by means of budding and in banana asexual reproduction occur by means of vegetative propagation from the stem. Thus, the correct answer is option B.

A student sowed two pieces of potato (A) with eye, (B) without eye. In which case plant will grow.​
  • a)
    A
  • b)
    B
  • c)
    Both
  • d)
    None
Correct answer is option 'A'. Can you explain this answer?

Vikas Kumar answered
The soil should be loose enough for the potato to send down roots easily. Take a piece of seed potato and press it firmly into contact with the soil. Be sure the “eye” faces up, as in the photo at left. Potatoes, unlike other garden crops, are usually not grown from small seeds. Instead, they grow from small cubes of tubers cut into chunks with at least two "eyes" known as seed potatoes. ... A potato's eyes only form and sprout under favorable growing conditions and after breaking from a dormant state.

Evolutionary change is not possible in:
  • a)
    Cross pollination
  • b)
    Sexual reproduction
  • c)
    Asexual reproduction
  • d)
    Fertilization
Correct answer is option 'C'. Can you explain this answer?

Mira Sharma answered
The correct option is C.
In asexual reproduction an exact genetic copy of the parent organism is produced (a clone ). Unlike sexual reproduction, asexual reproduction only introduces genetic variation into the population if a random mutation in the organism's DNA is passed on to the offspring.

Most of the flowering plants can reproduce by:
  • a)
    Sexual reproduction
  • b)
    Cloning
  • c)
    Asexual reproduction
  • d)
    Spore formation
Correct answer is option 'A'. Can you explain this answer?

Anjana Khatri answered
Often their most distinguishing feature is their reproductive organs, commonly called flowers. Sexual reproduction in flowering plants involves the production of male and female gametes, the transfer of the male gametes to the female ovules in a process called pollination.

Organism produced from two parents is an example of:
  • a)
    Asexual reproduction
  • b)
    Sexual reproduction
  • c)
    Binary fission
  • d)
    Evolution
Correct answer is option 'B'. Can you explain this answer?

Juhi Patel answered
Understanding Reproduction Types
Reproduction is a vital biological process through which organisms produce new individuals. There are two primary types of reproduction: asexual and sexual.
Asexual Reproduction
- Involves a single parent organism.
- Offspring are genetically identical to the parent (clones).
- Common methods include binary fission, budding, and vegetative propagation.
Sexual Reproduction
- Involves two parents, typically one male and one female.
- Offspring exhibit genetic variation due to the combination of genetic material from both parents.
- Involves the fusion of gametes (sperm and egg) leading to the formation of a zygote.
- This process enhances genetic diversity, which is crucial for evolution and adaptation.
Binary Fission
- A form of asexual reproduction.
- Primarily seen in unicellular organisms, such as bacteria.
- The organism divides into two identical cells, each a clone of the parent.
Evolution and Genetic Diversity
- Sexual reproduction plays a significant role in evolution.
- The genetic variation it produces allows populations to adapt to changing environments.
- Increased diversity can lead to greater resilience against diseases and environmental changes.
Conclusion
Given the definitions and processes outlined above, the correct answer to the question regarding the production of an organism from two parents is indeed option 'B', sexual reproduction. This method is essential for fostering genetic diversity and driving evolutionary processes in many species.

How does cell division commonly occur in bacteria and protozoa?
  • a)
    By unequal splitting during division
  • b)
    By forming multiple daughter cells
  • c)
    By splitting into two equal halves
  • d)
    By developing into spores
Correct answer is option 'C'. Can you explain this answer?

Avi trivedi answered
Cell Division in Bacteria
Bacteria typically reproduce through a process called binary fission. This method of division is efficient and allows for rapid population growth under favorable conditions.
Key Features of Binary Fission:
- Splitting into Two Equal Halves: In binary fission, the bacterial cell elongates, and the DNA replicates. The cell then divides into two nearly equal halves, each containing a copy of the original DNA. This is why option 'C' is the correct choice.
- Simple Process: The process consists of several stages: DNA replication, cell elongation, septum formation, and division into two daughter cells.
- Rapid Division: Under optimal conditions, bacteria can divide every 20 minutes, making binary fission an effective reproductive strategy.
Cell Division in Protozoa
Protozoa, which are single-celled eukaryotic organisms, also reproduce asexually through various methods, including binary fission, budding, or multiple fission.
Key Features of Protozoan Division:
- Binary Fission: Many protozoa, like bacteria, divide through binary fission, where one cell splits into two equal halves, similar to bacterial division.
- Multiple Fission: Some protozoa can undergo multiple fission, where a single cell divides into several daughter cells simultaneously. This is distinct from binary fission but does not contradict the notion of equal division, as multiple fission can lead to equal-sized daughter cells.
- Variation in Methods: Depending on species and environmental conditions, protozoa may also reproduce through budding or sporulation, but binary fission remains a primary method.
In summary, both bacteria and certain protozoa commonly divide by splitting into two equal halves, which is why option 'C' accurately describes their cell division process.

Assertion (A): Binary fission in Amoeba can occur in any plane.
Reason (R): Amoeba exhibits flexibility in the orientation of cell division.
  • a)
    If both Assertion and Reason are true and Reason is the correct explanation of Assertion
  • b)
    If both Assertion and Reason are true but Reason is not the correct explanation of Assertion
  • c)
    If Assertion is true but Reason is false
  • d)
    If both Assertion and Reason are false
Correct answer is option 'A'. Can you explain this answer?

Sneha das answered
Understanding Binary Fission in Amoeba
Binary fission is a common method of asexual reproduction in unicellular organisms like Amoeba. This process is crucial for their growth and reproduction.
Assertion (A): Binary fission in Amoeba can occur in any plane.
- This statement is true because Amoeba is an irregularly shaped organism with no fixed orientation.
- During binary fission, the cell divides into two daughter cells, and this division can take place in multiple orientations.
Reason (R): Amoeba exhibits flexibility in the orientation of cell division.
- This reason is also true as Amoeba has a flexible cell membrane that allows it to change shape.
- The flexibility enables the organism to divide along any plane, depending on its current shape and environmental conditions.
Relationship Between Assertion and Reason:
- The reason explains why the assertion is true. The flexibility of the Amoeba's structure directly influences its ability to divide in any plane.
- Since both statements are true and the reason accurately explains the assertion, the correct option is (a).
Conclusion:
- The nature of Amoeba allows it to perform binary fission in various orientations due to its flexible structure, making both statements valid and closely linked.
- This understanding emphasizes the adaptability of microorganisms in their reproductive processes.

Variations in offspring are mainly introduced as a result of:
  • a)
    Cloning
  • b)
    Asexual reproduction
  • c)
    Parthenogenesis
  • d)
    Sexual reproduction
Correct answer is option 'D'. Can you explain this answer?

Ias Masters answered
The main source of variation in offspring is sexual reproduction.

Sexual reproduction involves the fusion of gametes from two parents, resulting in offspring that inherit a unique combination of genetic material from both parents. This process introduces variation in several ways:


  • Independent assortment of chromosomes: During meiosis, the homologous pairs of chromosomes align randomly and separate into different gametes. This leads to different combinations of genes being passed on to the offspring.


  • Crossing over: Crossing over occurs during meiosis when homologous chromosomes exchange segments of genetic material. This further increases genetic diversity by shuffling genes between chromosomes.


  • Random fertilization: The chance of a specific sperm fertilizing a specific egg is random, leading to a nearly infinite number of possible combinations of genetic material in offspring.


  • Mutations: Mutations, which are changes in the DNA sequence, can occur spontaneously or as a result of environmental factors. These mutations can introduce new genetic variations in the offspring.


While asexual reproduction, cloning, and parthenogenesis can also produce offspring, they do not involve the combination of genetic material from two parents and therefore do not introduce as much variation as sexual reproduction.

The fertilisation of human egg by the sperm takes place in
  • a)
    vagina
  • b)
    uterus
  • c)
    ovary
  • d)
    oviduct
Correct answer is option 'D'. Can you explain this answer?

Akanksha Deshpande answered
Fertilization in Humans
Fertilization is a crucial process in human reproduction where a sperm cell merges with an egg cell. This process specifically occurs in the following location:
Location of Fertilization
- The correct answer is oviduct (also known as the fallopian tube).
Role of the Oviduct
- The oviduct serves as the pathway for the egg to travel from the ovary to the uterus.
- It is within the oviduct that the sperm meets the egg, creating a fertilized egg or zygote.
Process Breakdown
- Ovulation: An egg is released from the ovary during ovulation.
- Sperm Journey: After sexual intercourse, sperm travels through the female reproductive tract towards the oviduct.
- Fertilization: If a sperm successfully reaches the oviduct and penetrates the egg, fertilization occurs, resulting in the formation of a zygote.
Importance of the Oviduct
- The oviduct is designed to provide a suitable environment for fertilization and the early stages of embryo development.
- It ensures that the sperm and egg meet in a protected environment, enhancing the chances of successful fertilization.
Conclusion
Understanding where fertilization occurs is fundamental in reproductive biology. The oviduct plays a vital role in ensuring that the sperm and egg can successfully combine, leading to the formation of a new human life.

What is the purpose of using contraceptive devices?Options:
  • a)
    To improve fertility
  • b)
    To prevent pregnancy
  • c)
    To increase the release of eggs
  • d)
    To change body growth hormones
Correct answer is option 'B'. Can you explain this answer?

Nk Classes answered
The purpose of using contraceptive devices is to prevent pregnancy.
Contraceptive methods are designed to help individuals manage their reproductive health. Here are some key points:
  • Contraceptives create a barrier to stop sperm from reaching the egg.
  • Some contraceptives may have side effects due to hormonal changes.
Using contraceptive devices is essential for individuals who wish to avoid unintended pregnancies and manage their reproductive choices effectively.

The ability of a cell to divide into several cells during reproduction in Plasmodium is called
  • a)
    reduction division
  • b)
    budding
  • c)
    binary fission
  • d)
    multiple fission
Correct answer is option 'D'. Can you explain this answer?

Shubham Kumar answered
Multiple fission
because in multiple fission the single organism fuse (Blasts) or breakdown to form many new organjsms .(Individuals).
and plasmodium blasts to form many new organisms identical to itself .
another example is amoeba (During unfavrouble condition ) due to dehydration it devides into many new organisms identical to itself called amebae

When the foetus is growing inside the uterus it needs nutrients. Which part provides these nutrients?
  • a)
    Placenta
  • b)
    Amniotic sac
  • c)
    Oviduct
  • d)
    Uterus
Correct answer is option 'A'. Can you explain this answer?

Sravanthi Lakshmi answered
THE GROWING Foetus Recievies it's nutrients from placenta in the umbilical cord which is connected to the growing foetus from the mother and it receives all its nutrient rich content from mother directly through umbilical cord

What is the surgical method used in males for contraception, as described in the content?
  • a)
    Blocking the fallopian tube
  • b)
    Blocking the vas deferens
  • c)
    Placing an IUCD
  • d)
    Using chemical methods
Correct answer is option 'B'. Can you explain this answer?
?

Atharva Menon answered
Understanding Male Contraception
Contraceptive methods aim to prevent pregnancy, and in males, the most commonly discussed surgical method is a vasectomy.
What is a Vasectomy?
- A vasectomy is a surgical procedure that involves cutting and sealing the vas deferens, the tubes that carry sperm from the testicles to the urethra.
- This procedure effectively blocks sperm from mixing with semen, thus preventing sperm from being released during ejaculation.
Procedure Details
- The surgery is typically performed under local anesthesia.
- It can be done through small incisions or using a no-scalpel technique, which minimizes bleeding and recovery time.
- The procedure usually lasts about 15-30 minutes, and patients can often return home the same day.
Effectiveness of Vasectomy
- A vasectomy is one of the most effective forms of contraception, with a success rate exceeding 99%.
- It is considered a permanent method of contraception, although reversibility is possible in some cases.
Benefits of Vasectomy
- No impact on hormone levels or sexual function.
- It is a safer option compared to female sterilization.
- It eliminates the need for other contraceptive methods, providing long-term peace of mind.
Conclusion
In summary, the correct answer to the question regarding male surgical contraception is option 'B': blocking the vas deferens through a vasectomy. This method is a reliable and effective way for males to take control of their reproductive health.

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