Chapter 8: How Do Organisms Reproduce?- Exercises
Science
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Chapter 8: How Do Organisms Reproduce?
Class: X
Exercises
Question 1
Asexual reproduction takes place through budding in
- yeast
- amoeba
Answer 1
- Asexual reproduction takes place through budding in yeast.
Question 2
Which of the following is not a part of the female reproductive system in human beings?
- Fallopian tube
- Uterus
- Vas deferens
- ovary
Answer 2
- Vas deferens is not a part of the female reproductive system in human beings.
Question 3
The anther contains
Answer 3
- The anther contains pollen grains.
Question 4
What are the advantages of sexual reproduction over asexual reproduction?
Answer 4
The following are the advantages of sexual reproduction over asexual reproduction:
- More variations are produced that ensures survival of species in a population.
- Characteristics of both the parents are carried over to the new formed individual.
- Sexual reproduction limits the spread of harmful characteristics as compared to asexual reproduction.
Question 5
What are the functions performed by the testis in human beings?
Answer 5
Following are the functions performed by the Testis in human beings:
- Produce sperms
- Produce a hormone called testosterone, which brings about secondary sexual
characters in boys.
Question 6
Why does menstruation occur?
Answer 6
The menstruation is a hormonal process. A woman’s body goes through Menstrual cycle each month. Every month egg is released from the ovary and at the same time, the uterus prepares itself to receive the fertilized egg. The inner lining of the uterus thickens and blood is supplied to nourish the embryo. When the egg is not fertilized, the lining of the uterus slowly breaks down and gets released in the form of blood and mucus from the vagina.
Question 7
Draw a labelled diagram of the longitudinal section of a flower.
Answer 7
Question 8
What are the different methods of contraception?
Answer 8
Copper-T: Copper-T is a contraceptive device that is placed in uterus to prevent pregnancy. Surgical methods can also be used to stop the gamete transfer.
Natural Method: Natural method involves avoiding the chances of meeting of sperms and ovum. In this method, sexual act is avoided when ovulation is expected usually from day 10th to 17th of the menstrual cycle because during this period chances of fertilization are very high.
Oral contraceptives: Oral contraceptives contain small doses of hormones taken in the form of tablets or drugs orally that prevent the release of eggs to avoid fertilization.
Condoms: Condoms are like barrier that prevent sperms from entering into vagina. Condoms are made of thin latex and are available for both males and females. It is used for cover penis in males and vagina in females.
Question 9
How are the modes for reproduction different in unicellular and multicellular organisms?
Answer 9
Question 10
How does reproduction help in providing stability to populations of species?
Answer 10:
By reproduction process new individuals of the same species are produced. Reproduction helps in replacing the ageing population with the new population and hence provides stability of the population of species and ensures the survival of the species. Without reproduction one particular species will disappear with time.
Question 11
What could be the reasons for adopting contraceptive methods?
Answer 11:
Contraceptive methods are primarily adopted for the following benefits:
- Unwanted pregnancies prevention
- Population rise or birth rate control
- to prevent sexually transmitted diseases
