CHAPTER-7-HOW DO ORGANISMS REPRODUCE

CHAPTER-7-HOW DO ORGANISMS REPRODUCE

WORSHEET (VOLUME-1)

Time: 30 minutes
Max. Marks : 20

Multiple Choice Questions (1Mark)

  1. Which event will likely occur in the ovaries of females after attaining puberty?
    a) Fertilisation
    b) Synthesis of eggs
    c) Production of eggs
    d) Growth and development of the embryo
    Ans- IV. Liver
  2. Which among the following is not the function of the testes at puberty?
    (i) Formation of germ cells
    (ii) Secretion of testosterone
    (iii) Development of placenta
    (iv) Secretion of estrogen
    a) (i) and(ii)
    b) (ii) and(iii)
    c) (iii) and(iv)
    d) (i) and(iv)
  3. In the below figure, parts A, B and C are, sequentially,
    Diagram showing parts A, B and C
    a) Cotyledon, plumule and radicle
    b) Plumule, radicle and cotyledon
    c) Plumule, cotyledon and radicle
    d) Radicle, cotyledon and plumule
  4. When an organism breaks into a number of parts and each part develop into an individual, it is called:
    a) Budding
    b) Binary fission
    c) Regeneration
    d) Spore formation
  5. The process of release of eggs from the ovary is called
    (a) menstruation
    (b) reproduction
    (c) insemination
    (d) ovulation
  6. Anjali placed a bread piece in a moist box. After a few days, she noticed white cottony growth on it. Which method of reproduction is responsible for this growth?
    A. Budding.
    B. Binary fission
    C. Spore formation
    D. Fragmentation
  7. Assertion: The testes are located outside the abdominal cavity in the scrotum.
    Reason: Sperm formation requires a temperature slightly lower than body temperature.
    A. Both A and R are true, and R is the correct explanation of A.
    B. Both A and R are true, and R is not the correct explanation of A.
    C. A is true and B is false
    D. A is false and B is true
  8. During a lab activity, a student cuts the anthers of a flower. Which function will now be disrupted?
    A. Fertilization.
    B. Pollination
    C. Seed germination
    D. Fruit formation

VERY SHORT ANSWER 2(M) × 2(Q) = 4 (Marks)

  1. Name two sexually transmitted infections and state one method to prevent them.
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  2. Offspring’s formed as a result of sexual reproduction produce more variations. Give reason.
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SHORT ANSWER 3(Marks)

  1. (a) Explain the terms:
    (i) Implantation (ii) Placenta
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    (b) What is the average duration of human pregnancy?
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LONG ANSWER 5(Marks)

  1. Given below is the diagram of the female reproductive system.
    Diagram of the female reproductive system
    A. Identify and label the part where implantation occurs.
    B. Identify and label the part which produces female hormones.
    C. Name the female hormones.
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    D. What happens if egg doesn’t meet with sperm?
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Answers

  1. (c)
  2. (c)
  3. (c)
  4. c) Regeneration
  5. (d) ovulation
  6. C. Spore formation
  7. A
  8. B. Pollination
  9. HIV, Syphilis, Gonorrhea, Genital herpes (Any two).
    Using Contraceptive devices like condoms
  10. They inherit genetic material from two parents, resulting in a mix of traits not present in either parent. This mixing of genetic information increases variation.
  11. (i) Implantation is the process where the fertilized egg (blastocyst) attaches to and embeds itself into the lining of the uterus (endometrium). This is a crucial step in establishing a pregnancy, as it allows the embryo to receive nutrients and oxygen from the mother.
    (ii) Placenta: The placenta is a temporary organ that develops during pregnancy, formed from both maternal and fetal tissues. It serves as a vital link between the mother and the fetus, facilitating the exchange of nutrients, oxygen, and waste products. The placenta also produces hormones that support the pregnancy.
    (b) Average Duration of Human Pregnancy: The average duration of human pregnancy is 40 weeks, or 280 days.
  12. A. uterus
    B. ovary
    C. Estrogen and progesterone
    D. If a sperm doesn't fertilize an egg, the egg will disintegrate
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