biology revision sheets class 10
Earth science
10 pag.
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DELHI PUBLIC SCHOOL, CHANDIGARH
Biology Revision Assignment
Class X
Name:
Class & Section
How do organisms reproduce? (Asexual reproduction and sexual
reproduction in plants)
1.
What is reproduction? What are its two types? Which one of the two
confers new characteristics on the offsprings and how?
2.
Name and define the type of reproduction in the following
Amoeba, yeast, plasmodium, spirogyra, rhizopus, planaria, hydra, bryophyllum.
3.
Name the two groups which reproduce most commonly by fission.
4.
What is the advantage of reproduction through spores in the case of
rhizopus?
5.
How do spores protect themselves in unfavorable condition?
6.
Name the cells responsible for budding in hydra.
7.
Name the diseases caused by plasmodium and leishmania.
8.
How is binary fission in Amoeba differ that occurring in leishmania.
9.
Name the plants which have lost the capacity to produce seed.
10.
What happens to a slice of bread kept in a moist dark place?
11.
Regeneration is not reproduction. Justify the statement.
12.
Write advantages and disadvantages of vegetative propagation.
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Home Work
1.
Define pollination. Differentiate between self -pollination and cross
pollination.
2.
Differentiate between unisexual and bisexual flowers.
3.
Which part of the pistil receive pollen grains to perform
4.
Name the process that occurs after pollination.
5.
Name the male and female part of the flower.
6.
Write the function of the petal.
7.
Name the gamete producing organs in the flower.
8.
What are the post fertilization changes that occurs in a flower?
9.
Which parts of the flower change to fruit and seed after fertilization.
10.
Name the structure into which following develop: the plumule and radicle?
11.
Label the following diagrams
reproduction.
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12. Identify and name
A.
B.
C.
D.
E.
F.
G.
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DELHI PUBLIC SCHOOL, CHANDIGARH
Biology Revision Assignment
Class X
Name:
Class & Section
How do organisms reproduce? (Sexual Reproduction in humans)
1.
Onset the puberty involves certain common changes in boys and
them.
girls. Enlist
2.
Where are the testes located in human beings?
3.
For what specific reason have the testes specific location?
4.
Write two important functions of testosterone.
5.
Enlist the role of secretion of seminal vesicle and prostate gland.
6.
Distinguish male urethra from female urethra in humans.
7.
Differentiate between male and female gamete in human beings.
8.
Where does the zygote get implanted?
9.
Which two important chemical substances are delivered to developing embryo
through placenta?
10.
Name the tissue in mother's body that provides nutrition to developing embryo?
Home Work
1.
Describe the changes in lining of uterus in case the egg is not fertillized.
2.
Name two bacterial and two viral STD.
3.
How change in hormonal balance prevents pregnancy?
4.
Write one side effect of loop placed in uterus?
5.
Which structures need to be blocked in males and females respectively to
prevent pregnancy?
6.
Name the chemical methods of preventing pregnancy.
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7.
Draw a diagram of a human female reproductive system and label the part
(i) that produces egg
(ii) where fusion of egg and sperm take place
(iii) where zygote is implanted
8. Label the following diagrams
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DELHI PUBLIC SCHOOL, CHANDIGARH
Biology Revision Assignment
Class X
Name:
Class & Section
Heredity and Evolution
1. What is the effect of DNA copying which is not perfectly accurate on the
reproduction process?
2. Define variation in relation to a species. Why is variation beneficial in the
species?
3. Akshat and his wife have attached earlobe (recessive trait) and are professional
dancers. They told their colleagues that their offspring would also have attached
earlobe and will be a good dancer. Is their notion, right? Support your answer
with suitable reasons.
4. Mention the information source of making proteins in the cell. What is thee basic
event in reproduction?
5. What term did Mendel use for gene?
6. Write the sex of the baby that inherits Y-chromosome from the father.
7. Give an example where sex is determined by the environmental factors.
8. In pea plant, round seed is dominant over wrinkled. If a cross is carried between
these two plants, give answer to the following questions.
(a) Mention the genes for the traits of parents.
(b) State the trait of F1 hybrids.
(c) Write the ratio of F2 progeny obtained from this cross. What is the name of
the cross?
9. Can you justify the statement that “Human males are responsible for determining
the sex of the baby and not females”?
10. Ashima saw a female being blamed by the family members for producing a girl
child. She approached them and told that the genetic basis of sex determination
of human beings clearly indicates that only the female should not be blamed for
producing a girl child. The family members agreed to her argument and felt sorry
for their act.
Based on the above answer the following questions:
(а) What is the basis of sex determination in human beings?
(b) What are the chances of the birth of a boy or a girl during sexual
reproduction in human beings?
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11. Demonstrate with an example that traits may be dominant or recessive. Write
down Mendel’s law related to it.
12. In a cross between plants with purple flowers and plants with white flowers, the
FI had all white flowers. When F1 generation was self-bred, the F2 generation
gave rise to 100 individuals, 75 of which had white flowers. Make a cross and
answer.
(а) What are the genotypes of F2 individual?
(b) What is the ratio of purple flowered plants in F2 generation?
13. How many pairs of chromosomes do human beings have, specify the type of
chromosomes also?
14. Give the scientific name of the plant on which Mendel performed its experiments.
Why he selected this plant?
15. A cross was made between pure breeding pea plants one with round and green
seeds and the Other with wrinkled and yellow seeds.
(a) Write the phenotype of F1progeny. Give reason for your answer.
(b) Write the different types of F2 progeny obtained along with their ratio when
F1 progeny was self-bred.
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DELHI PUBLIC SCHOOL, CHANDIGARH
Biology Revision Assignment
Class X
Name:
Class & Section
Our Environment
1.
Give an example each of natural and an artificial ecosystem.
2.
What is the full form of CFCs and UNEP?
3.
Define ecosystem and name its components.
4.
What is the ultimate source of energy in an ecosystem? Which process helps to
trap this energy in producers?
5.
Why are crop fields known as artificial ecosystems?
6.
Explain the effects of human activity on the environment?
7.
What is the role of ozone? Why is it being depleted?
8.
What are the aftereffects of ozone depletion?
9.
What is ten per cent law? Explain with an example how energy flows through
different trophic levels
10.
Why is it necessary to manage our garbage?
11.
List two advantage of decomposers to the environment.
12.
Why should biodegradable and non-biodegradable wastes to be discarded in two
separate dustbins?
13.
Arrange these organisms in a food chain Snake, Plants, Frog, Bird
14.
The first trophic level in a food chain is always a green plant. Why?
15.
Make food chains in (i) forest (ii) grassland (iii) pond. How does food chain differ
from a food web?
16.
Indicate the flow of energy in an ecosystem. Why is it unidirectional?
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17.
Write the harmful effects of using plastic bags on the environment. Suggest
alternatives to plastic bags.
18.
Construct an aquatic food chain showing four trophic levels.
19.
Our food grains such as wheat and rice, vegetables, and fruits, and even meat
are found to contain varying amounts of pesticide residues. State the reason
to explain how and why it happens?
20.
How is ozone formed in the higher level of the atmosphere?
21.
Explain phenomenon of “biological magnification”. How does it affect organisms
belonging to different trophic levels particularly the tertiary consumers?
22.
Explain some harmful effects of agricultural practices on the environment.
23.
In a food chain, if 10000 Joules of energy is available to the producer, how much
energy will be available to the secondary consumer to transfer it to the
tertiary consumer?
24.
In the following food chain 100J of energy is available to the lion. How much
energy was available to the producer?
Plants→ Deer→ Lion
25.
What would happen if number of carnivores decreases in an ecosystem?
26.
Mention any one advantage of using disposable paper cups over disposable
plastic cups. Write one point how paper cups do not adversely affect the
environment.
27.
What is the reason that a food chain consists of only 3-5 steps?
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