MATHPAL CLASSES & SACHDEVA STUDY ZONE&
CATALYST INSTITUTE
CLASS 10
HOW DO ORGANISMS REPRODUCE
CLASSES BY JOSHI SIR(8410108680)
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Q.1. What is meant by budding?
Answer: Budding is one of methods of asexual multiplication in which the cell division
takes place at one specific site and turns out into an outgrowth. The little knob like
projection turning out from the main body is known as a bud. The new life form grows
there at the same site and get detached at when fully grown leaving behind the scar
tissue. Since the proliferation is asexual, the recently made life form is a clone and is
identical to the parent life form.
For example: budding in yeast
Q.2. In which organisms spore formation takes place?
Answer: The spores are the minute, intense and resistant bodies which are round fit
and can develop into another plant under reasonable conditions. The spore formation
method of asexual reproduction is used by unicellular as well as multicellular organisms.
For example: Rhizopus, Mucor and some non-flowering plants.
Q.3. What is meant by binary fission?
Answer: Binary fission is a type of asexual reproduction which involves the splitting of
parent organism into two new organisms. In this type of asexual reproduction the parent
ceases to exist and two new forms come into existence.
For example: Amoeba, Paramecium etc.
Q.4. What is meant by ovulation?
Ovulation is the arrival of an egg from one of a lady's ovaries. After the egg is
discharged, it goes down the fallopian tube, where fusion by a sperm cell may happen.
Q. 5. What is the role of placenta?
Answer: The role of placenta is to provide all the developing requirements to the
developing foetus. These requirements are:
• Nutrition
• Respiration
• Excretion etc.
Q. 6. What is the function of testes?
Answer: Testes are the primary reproductive structures or organs in males. Its function
is
• To make sex cells i.e. male gametes called sperm.
• To make male sex hormone, testosterone.
Q.7. What is the function of prostate glands and seminal vesicles?
Answer: Prostrate gland is a male reproductive organ which secretes prostrate fluid
which is a component of semen. The seminal vesicles secrete a significant proportion of
the fluid that ultimately becomes semen. The secretions of seminal vesicle and
prostrate gland provides nutrition to sperm and also make their further transport easy.
Q.8. What is the function of ovaries?
Answer: Ovaries are the primary reproductive organs in females. The function of
ovaries is:
• To make mature female sex cells i.e. female gametes called ova.
• To make female sex hormones, oestrogen and progesterone.
Q.9. Why is DNA copying an essential part of the process of reproduction?
Answer: DNA is the carrier of genetic information. It is the blueprint of necessary
information. For a parent to produce offspring of its own type, it is essential that the
offspring carries same DNA as in parents. Thus, DNA copying or DNA replication is the
only way through which a cell makes additional copies of same DNA which can be
transmitted to its offspring. Thus, DNA copying is an essential mechanism.
Q.10. What are bisexual organisms? Give examples.
Answer: The organisms which have both male and female reproductive system within
the same organism called bisexual organisms.
For example: earthworm, leech, starfish etc.
