One mark question
Q1. Name the type of fission carried out by amoeba.
Ans. Binary fission.
Q2. What is vegetative
propagation?
Ans.
When new plants are grown by using vegetative parts like root, stem and leaves
it is known as vegetative propagation.
Q3. Name an organism which reproduces by multiple fission.
Ans.
Plasmodium {malarial parasite}
Q4. What is Puberty?
Ans.
The age at which the human males and females becomes sexually mature is called
puberty.
Q5. What is pollination?
Ans.
The transfer of pollen grains from anther to the stigma of the same or another
flower of the same kind is called pollination.
Q6. What is fertilization?
Ans.
The fusion of male and female gametes is called fertilization.
Q7. What is placenta?
Ans.
The tissue connecting developing embryo {foetus} and mother is called placenta.
Q8. What is asexual reproduction?
Ans.
The process of reproduction in which only one parent is involved and no sex
cells are involved
is called asexual reproduction.
Q9. Write the expanded form of AIDS.
Ans.
Acquired Immuno deficiency Syndrome is the full form of AIDS.
Q10. Name two sexually transmitted diseases.
Ans.
1.AIDS. 2.
Gonorrhea. 3.
Syphilis
Two
mark question
Q1.Name those parts of the flower which serve the same function
as the following do in the animals:
1. Testes. 2. Ovary.
3. Eggs. 4. Sperms
Ans.1.Stamen. 2.
Carpel
3.
Ovule. 4.
Pollen grain
Q2. What methods will you use for growing jasmine and rose plant?
Ans.
Layering method of artificial vegetative propagation can be used for growing
jasmine plant.
Stem cutting method can be used for growing rose plant.
Q3.Mention any two functions of human ovary.
Ans.1.It
produces ovum the female gamete.
2.
It secretes hormone estrogen.
Q4. Define menstruation.
Ans.
The breakdown and removal of the inner thick and soft lining of the uterus
along with its blood vessels in the form of vaginal bleeding is called
menstruation.
Q5. How the surgery methods are misused by people to prevent
pregnancy?
Ans.
Surgery methods are misused to prevent pregnancy. This method can be used for
removal of unwanted pregnancies by people who do not want a particular child
which happens in case of illegal sex selective abortion of female foetus.
Q6. What is the significance of human testes being located in
the scrotum?
Ans.
Scrotum protects the testes by regulating the temperature of the testes. Sperms
need a temperature less than the body temperature for their production and
development.
Q7. Questions: Name those
parts of a flower which serve the same function as the following do in the animal
(i) Testis (ii) Ovary (iii) Eggs (iv) Sperms
Ans:
Testis
as anther
Ovary
ovules present inside ovary
Eggs
as eggs
Sperms
as pollen grains
Q.8 Pre - natal sex determination
has been prohibited by law. State two reasons.
Q.9. What is placenta ?
State its any two roles during pregnancy.
Ans: The placenta is an organ that connects the developing fetus to the uterine wall to allow nutrient uptake, waste elimination, and gas exchange via the mother’s blood supply. "True" placentas are a defining characteristic of eutherian or "placental" mammals, but are also found in some snakes and lizards with varying levels of development up to mammalian levels.the following are the roles :-
(b) Without it the baby could not survive. After your baby is born, the placenta no longer serves a function.
Q10. Small piece of root tissue was taken from the rose plant and placed in a nutrient medium. Each root tissue produced a new rose plant. Name the reproductive process involved. What type of genes will be possessed by new rose plant ?
Sol.
(i) This process is called tissue culture.
(ii)
Genes possessed by the new plant is same as that of the parent plant.
Three marks question
Q1. (a). What is fertilization? Distinguish between external
fertilization and internal fertilization.
(b). What is the site of
fertilization in human beings?
Ans.(a)
Fertilization is defined as the fusion
of male and female gametes to form a zygote during a
sexual reproduction.
Difference between external and Internal fertilization
External
fertilization
|
Internal
fertilization
|
1.
The fusion of male and female gametes
occurs outside the body.
|
1.
The fusion of gametes occurs inside the body.
|
2.
Both individual discharge their gametes
outside the body and development
occurs
outside the body.
|
2.
The gametes fuse inside the female body and
development occurs inside the
body.
|
Example:
Frogs
|
Example:
Birds, cattle, humans
|
(b) The site of fertilization in human beings is
in the fallopian tube of female reproductive system.
Q2. Give two advantages of vegetative propagation.
Ans.
1(i). Vegetative propagation is a cheaper, easier and more rapid method of
propagation in plants
than growing plants from seeds.
(ii).
The characteristics of the parent plant are preserved by vegetative
propagation.
Q3. Describe the surgical methods of birth control.
Ans.
The surgical method can be done in males as well as in females.
In
case of males the vas deference is blocked and sperm transfer is prevented. In
case of females the
fallopian tube is blocked the egg will not be able to reach
the uterus. These are permanent methods of birth control.
Q4. Why is DNA copying an essential part of the process of
reproduction?
Ans.
DNA copying is an essential part of the process of reproduction because-
- DNA
provides cellular apparatus in the daughter cells.
- DNA
in the daughter cells will control their functioning
- DNA
copies will retain the characters.
Q5. What could be the reasons for the adopting of contraceptive
methods?
Ans.
Contraceptive methods are adopted for the following reasons:
1. For
preventing unwanted pregnancies and keeping the health of women.
2. 2.
To prevent the transmission of fatal diseases mechanical barrier methods are
used.
Q.6. Mention
any three advantages of variation in individuals.
Ans:
(i) Variation helps in
survival of species.
(ii) It is the basis of
evolution.
(iii) It brings adaptation
in individuals.
Q.7. Name the
filamentous structure seen in pond. Explain how do they reproduce.
Ans: Spirogyra have filamentous structure. They
reproduce by the process of fragmentation in which they break up into smaller
pieces upon maturation. These pieces grow into new individuals.
Q.8. A student
noticed that an organism by mistake was cut in two parts. After sometime both the parts developed into
new individuals.
(a) Name the
mode of reproduction used by the organism.
(b) State the
type of cells which carry this process.
(c) Write
examples of two organisms which multiply by this process.
Ans:
(a) Regeneration (asexual
reproduction)
(b) Specialised cells.
(c) Hydra and Planaria
Q9. Ravi
took three bread slices and kept the three pieces of the slices in the following conditions.
(i) Slice 1 in a dried and dark place.
(ii) Slice 2 in a moist and dark place.
(iii) Slice 3 in moist and in refrigerator.
What would he observe in each of the above conditions ? Give reasons for your
answer ?
Ans:
(i) In
Slice 1, No spore will develop due to lack of moisture.
(ii) A
white cottony mass surrounded with a black mass is seen spreading on the
surface of slice 2 due to formation of sporangia and spores as moisture and
darkness provide favourable condition.
(iii) In
slice 3, no spore will be formed as it is kept at a lower temperature in the
refrigerator, which is not a favourable condition.
Q10. (i) State
the function of (a) stigma (b) pollen tube.
(ii) What happens to the ovule after fertilization ?
Ans: .
(i) (a) Stigma receives
pollens.
(b) Pollen tube helps to carry the male
germ cell to the female germ cell from the stigma to the ovary.
(ii) After fertilization,
the ovule develops into seed.
Links For CBSE Class X Science Term-II
Links For CBSE Class X Science Term-II
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