NCERT Solutions For Class 10 Chapter 07 Exercise Questions
Q1: Asexual reproduction takes place through budding in:
- a) Amoeba
- b) Yeast
- c) Plasmodium
- d) Leishmania
Answer:
Amoeba reproduces asexually through binary fission. Plasmodium reproduces in two ways: asexually and sexually. It’s a digenetic species, meaning it goes through its entire life cycle in two different hosts. The female anopheles mosquito is the principal host, and sexual reproduction occurs through the fusion of male and female gametocytes. Parasitic protozoa of the genus Leishmania are generally thought to multiply by binary fission.
So, the correct option is b) Yeast, which reproduces asexually through budding.
Q2: Which of the following is not a part of the female reproductive system in human beings?
- a) Ovary
- b) Uterus
- c) Vas deferens
- d) Fallopian tube
Answer:
Among the above-mentioned organs, Ovary, Uterus & Fallopian tubes belong to the female reproductive system. So, the correct option is c) Vas deferens. It is a coiled tube that carries the sperm out of the testes. Hence, it is a part of the male reproductive system.
Q3: The anther contains
- a) Sepals
- b) Ovules
- c) Carpel
- d) Pollen grains
Answer:
The anther contains d) pollen grains, which enter the ovary of the gynoecium and help in sexual reproduction in plants
Q4: What are the advantages of sexual reproduction over asexual reproduction?
Answer:
Advantages of sexual reproduction over asexual reproduction:
- Produces genetic variation in the offspring.
- The species can adapt to new environments due to variation, which gives them a survival advantage.
- A disease is less likely to affect all the individuals in a population.
Q5: What are the functions performed by the testis in human beings?
Answer:
The Testis has the following three functions:
- It produces spermatozoa, the male gametes.
- It synthesizes testosterone, the major male sex hormone.
- It participates with the hypothalamus-pituitary unit in regulating reproductive function.
Q6: Why does menstruation occur?
Answer:
Menstruation is the monthly shedding of the lining of the uterus. Menstruation is also known by the terms menses, menstrual period, menstrual cycle, or period. Menstrual blood, which is partly blood and partly tissue from the inside of the uterus, flows from the uterus through the cervix and out of the body through the vagina.
Menstruation is driven by hormones. Hormones are chemical messengers in our bodies. The pituitary gland and ovaries make and release certain hormones at certain times during the menstrual cycle.
These hormones cause the lining of the uterus to thicken. This happens so that if a pregnancy would occur, an egg can implant into the uterine lining. Hormones also cause ovaries to release an egg (ovulation). The egg moves down the fallopian tubes, where it waits for sperm. If a sperm doesn’t fertilize that egg, pregnancy doesn’t occur. The lining of the uterus breaks down and sheds and this is Menstruation.
Q7: Draw a labeled diagram of the longitudinal section of a flower.
Answer:
- Peduncle: The stalk of a flower.
- Receptacle: The part of a flower stalks where the parts of the flower are attached.
- Sepal: The outer parts of the flower (often green and leaf-like) that enclose a developing bud.
- Petal: The parts of a flower that are often conspicuously colored.
- Stamen: The pollen-producing part of a flower, usually with a slender filament supporting the anther.
- Anther: The part of the stamen where pollen is produced.
- Pistil: The ovule-producing part of a flower. The ovary often supports a long style, topped by a stigma. The mature ovary is a fruit, and the mature ovule is a seed.
- Stigma: The part of the pistil where pollen germinates.
- Ovary: The enlarged basal portion of the pistil where ovules are produced.
Q8: What are the different methods of contraception?
Answer:
Contraception, also known as Birth control is the use of medicines, devices, or surgery to prevent pregnancy. Different methods of contraception:
- Intrauterine Method: An intrauterine device (IUD), also known as an intrauterine system (IUS), is a small, T-shaped device that is inserted into the uterus to prevent pregnancy. Example: Hormonal IUD or IUS, Copper IUD.
- Implants: Implants are implantable rods. Each rod is matchstick-sized, flexible, and plastic. The rod releases progestin and can remain implanted for up to 5 years.
- Combined oral contraceptives (COCs, “the pill”): COCs contain synthetic estrogen and progestin, which function to inhibit ovulation. A woman takes one pill daily, preferably at the same time each day.
- Condoms: This condom is a thin sheath that covers the penis to collect sperm and prevent it from entering the woman’s body.
- Tubal ligation: It is a surgical procedure in which a doctor cuts, ties, or seals the fallopian tubes.
- Vasectomy: It is a surgical procedure that cuts, closes, or blocks the vas deferens.
Q9: How are the modes of reproduction different in unicellular and multicellular organisms?
Answer:
- Unicellular organisms reproduce by the division of the entire cell. The modes of reproduction in unicellular organisms are:
Fission, budding.- In multicellular organisms, specialized reproductive organs are present. Therefore, they can reproduce by complex reproductive methods: Vegetative propagation, spore formation, fragmentation, and regeneration.
- In more complex multicellular organisms such as human beings, the mode of reproduction is sexual reproduction where both parents are involved.
Q10: How does reproduction help in providing stability to populations of species?
Answer:
- Reproduction can be defined as the process by which new individuals of a particular species are formed on Earth. The stability of the population is ensured only when reproduction takes place.
- The natural cycle of life and death also removes a section of the population. Reproduction is a way to replenish the lost section.
- In reproduction, DNA passes from one generation to the next. Copying of DNA takes place with consistency. The consistency of DNA copying during reproduction is important for the maintenance of body design features that allow the organism to use that particular niche.
Q11: What could be the reasons for adopting contraceptive methods?
Answer:
Contraceptive methods are mainly adopted because of the following reasons:
- To prevent unwanted pregnancies.
- To control population rise or birth rate.
- To prevent the transfer of STDs (Sexually Transmitted Diseases).
Key Features of NCERT Solutions Class 10 Biology Chapter 7 How do organisms Reproduce?
- They enhance the conceptual knowledge of the students.
- Clear and Comprehensible Content.
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Also Check:
NCERT Solutions for Class 10 Science Chapter 7 – How Do Organisms Reproduce?
How Do Organisms Reproduce Chapter 7: *As per the revised curriculum of CBSE Syllabus 2023-24, this chapter, previously known as Chapter 8, has now been renumbered as Chapter 7. Stay updated with the latest changes in the curriculum.
How do organisms reproduce? Class 10 NCERT Solution is all about the reproduction process by different organisms. These NCERT Solutions are prepared by our Top Biology Experts in order to take care of all Important Topics that might be asked in the upcoming examination 2023. So, Students can also refer to these solutions for their final Examination preparation.
This Class 10 Biology Chapter 7 How do organisms reproduce? NCERT Solutions are carefully developed using easy-to-understand language while adhering to the guidelines for solving NCERT Solutions for Class 10. Working through these solutions can be highly beneficial for students in their board exams, as well as in preparing for future competitive Exams.