Arihant - Class X - How do organisms reproduce? [ Chapter - 8 ]Contact Number: 9667591930 / 8527521718Arihant - Class X - How do organisms reproduce? [ Chapter - 8 ]Contact Number: 9667591930 / 8527521718What is the importance of DNA copying in reproduction?
Why is variation beneficial to the species, but not necessary for the individual?
How does binary fission differ from multiple fission?
How will an organism be benefitted, if it reproduces through spores?
Can you think of reasons why more complex organisms cannot give rise to new individuals through regeneration?
Why is vegetative propagation practiced for growing some types of plants?
Why is DNA copying an essential part of the process of reproduction?
How is the process of pollination different from fertilisation?
What is the role of the seminal vesicles and the prostate gland?
What are the changes seen in girls at the time of puberty?
How does the embryo get nourishment inside the mother's body?
If a woman is using a copper-T, will it help in protecting her from sexually transmitted diseases?
Asexual reproduction takes place through budding in
1. Amoeba
2. Yeast
3. Plasmodium
4. Leishmania
Which of the following is not a part of the female reproductive system in human beings?
1. Ovary
2. Uterus
3. Vas deferens
4. Fallopian tube
The anther contains
1. sepals
2. ovules
3. carpels
4. pollen grains
What are the advantages of sexual reproduction over asexual reproduction?
What are the functions performed by the testes in human beings?
Why does menstruation occur?
Draw a labelled diagram of the longitudinal section of a flower.
What are the different methods of contraception?
How are the modes of reproduction different in unicellular and multicellular organisms?
How does reproduction help in providing stability to population of a species?
What could be the reasons for adopting contraceptive methods?
What happens when Planaria gets it into two pieces?
State the method used for growing rose plants.
Define sexual reproduction.
Name the reproductive parts of a flower with their subparts.
When does pollen tube develop in a flower?
What is fertilisation and its product?
At which age do eggs or follicles start maturing in females?
Explain the term primary sex characters.
Why are testes located outside the abdominal cavity?
List two functions of ovary of female reproductive system.
What is the first sign of pregnancy in a woman?
What is the function of the umbilical cord?
How do hormonal methods of contraception act?
How can pregnancy be prevented surgically?
List out the basic features of reproduction.
Differentiate between the process of binary fission and budding.
Can you consider cell division as a type of reproduction in unicellular organism? Give one reason.
What is a clone? Why do offsprings formed by cloning exhibit remarkable similarity?
Does a Planaria if cut vertically into two halves regenerate into two individuals? Complete figures D and E by indicating the regenerated regions.
Why does bread mould grow profusely on a moist slice of bread rather than on a dry slice of bread?
In tobacco plant, the male gamete has twenty four chromosomes. What is the number of chromosomes in the female gamete? What is the number of chromosomes in the zygote?
In what respect is the human male gamete different from the female gamete? What is the importance of this difference?
(i) Trace the path of sperms from where they are produced in human body to the exterior.
(ii) Write the functions of secretions of prostate gland and seminal vesicle in humans.
Name the organ where sperms are produced and name the hormone produced by it. Why do sperms have a tail, but ovum does not have it?
(i) Which glands provide fluid to the semen?
(ii) State two advantages of semen in relation to sperms.
(i) Name the site of implantation and development of baby in human female.
(ii) Mention any two benefits of using barrier method during sexual act.
What substances pass
(i) from the maternal to the foetal blood?
(ii) from the foetal to the maternal blood?
In the given figure label the parts and mention their functions
(i) Production of egg
(ii) Site of fertilisation
(iii) Site of implantation
(iv) Entry of the sperms
During sexual reproduction, the amount of DNA does not get doubled. Explain.
What are the benefits of using mechanical barriers during sexual act?
Describe sexually transmitted diseases and mention the ways to prevent them.
A stock contains 58 chromosomes and scion contains 30 chromosomes, then how many chromosomes are present in root and egg cell of resultant plant, respectively?
An interesting modification of flower shape for insect pollination occurs in some orchids in which a male insect mistakes the pattern on the orchid flower for the female of his species and tries to copulate with it, thereby pollinating the flower. What type of pollination is observed?
Is the chromosome number of zygote, embryonal cell and adult of a particular organism always constant? How is the constancy maintained in these three stages?
Offsprings and parents of organisms reproducing sexually have the same number of chromosomes. Justify.
'Sexual reproduction promotes, diversity of characters in the offsprings'. Comment.
Reproduction is linked to stability of population of a species. Justify the statement.
Correlate the number of chromosomes with the size of the organism and answer the following questions.
(i) Do larger organisms have more number of chromosomes/cells?
(ii) Can an organism with fewer chromosomes reproduce more easily than organisms with more number of chromosomes?
(iii) More the number of chromosomes/cells greater is the DNA content. Justify.
Study the diagram given below:
(i) Identify the process.
(ii) Which organism uses the above method for reproduction?
(iii) How is the above method different from the process of fragmentation?
(i) Identify whether budding as seen in Hydra is a type of sexual or asexual reproduction.
Give reason for your answer.
(ii) How is this process different from fission?
Explain the term 'Regeneration' as used in relation to reproduction of organisms. Describe briefly how regeneration is carried out in multicellular organisms like Hydra.
List any three advantages of vegetative propagation.
Ravi took three bread slices and kept them in the following conditions
(i) Slice 1 in a dry 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.
List six specific characteristics of sexual reproduction.
Name the parts A, B and C shown in the following diagram and state one function of each.
(i) Define germination.
(ii) From the diagram given below identify the incorrectly labelled parts.
(i) Label the following diagram.
(ii) Which process is being shown in the diagram?
(i) List two reasons for the appearance of variations among the progeny formed by sexual reproduction.
(ii)
(a) Name the part marked A in the diagram.
(b) How does A react part B?
(c) State the importance of the part C.
(d) What happens to the part marked D after fertilisation is over?
What is meant by pollination? Name and differentiate between the two modes of pollination in flowering plants.
In a bisexual flower inspite of the young stamens being removed artificially, the flower products fruits. Provide a suitable explanation for the above situation.
The sperms are tiny bodies that consist of mainly genetic material and a long tail
(i) Where are the sperms produced?
(ii) What is the role of the long tail?
(iii) How are the sperms delivered from the site of their production?
(i) Name the parts A to E of human female reproductive system.
(ii) Name the part in which fertilisation takes place in this system.
Draw the human female reproductive system and label the following parts:
(i) Which produces ovum?
(ii) Where fertilisation takes place?
(iii) Where implantation of embryo takes place?
How does fertilisation take place? Fertilisation occurs once in a month. Comment.
Trace the path of sperm during ejaculation and mention the glands associated with the male reproductive system and their functions.
What changes are observed in the uterus if fertilisation does not occur?
Distinguish between a gamete and zygote. Explain their toles in sexual reproduction.
What would be the ratio of chromosome number between an egg and its zygote? How is the sperm genetically different from the egg?
What is placenta? Describe its structure. State its functions in case of pregnant human female.
Give two reasons for the appearance of variations among the progeny formed by sexual reproduction.
Write one difference between asexual and sexual modes of reproduction. Which species is likely to have better chances of survival, the one reproducing asexually or the one reproducing sexually? Justify your answer.
Suggest three contraceptive methods to control the size of human population which is essential for the health and prosperity of a country. State the basic principle involved in each.
What are the various ways to avoid pregnancy? Elaborate any one method.
What changes are observed in the uterus subsequent to implantation of young embryo?
Why are budding, fragmentation and regeneration all considered as asexual types of reproduction? With neat diagrams explain the process of regeneration in Planaria.
Answer the following questions:
(i) Name any three asexual modes of reproduction.
(ii) Explain with diagram the method by which Amoeba reproduces.
(iii) How is fission different from fragmentation?
(i) Identify the organisms A and B and the mode of asexual reproduction exhibited by them.
(ii) How will an organism be benefitted if it reproduces through spores?
(iii) Mention the two asexual methods by which Hydra can reproduce. Explain briefly any one such method.
Explain the process of seed and fruit formation in plants.
Name the following
(i) The body part in which the testes are present in a human male.
(ii) The part from where the sperms are released out of the body.
(iii) The part of female reproductive system containing a mature egg.
(iv) The accessory fluid in human males, whose secretion activates the sperms.
(v) The period of adolescence when the reproductive tissues begin to mature.
Given below is the diagram of a reproductive system.
(i) Name the system.
(ii) Name the parts labelled as A-I.
(iii) Describe the functions of parts C, D, E and F.
Trace out the movement and fate of egg in female body.
Give reasons:
(i) Placenta is extremely essential for foetal development.
(ii) Blocking of vas deferens prevents pregnancy.
(iii) Wind acts as a pollinating agent.
(iv) Use of condoms prevents pregnancy.
(v) Blocking of Fallopian tubes prevents Pregnancy.
Describe the menstrual cycle.
A student is observing a permanent slide showing sequentially the different stages of asexual reproduction taking place in yeast. Name this process and draw diagrams of what he observes in a proper sequence.
Draw a labelled diagram to show that particular stage of binary fission in Amoeba in which its nucleus elongates and divides into two and a constriction appears in its cell membrane.
In which organism during division, a chain of daughter cells are formed on the parent body? Also draw this stage of division in that organism?
Students were asked to observe the permanent slides showing different stages of budding in yeast under high power of microscope.
(i) Which adjustment screw (coarse/fine) were you asked to move to focus the slides?
(ii) Draw three diagrams in correct sequence showing budding in yeast.
Rohini's parents received a proposal for her marriage from a boy living in UK. Before everything could get finalised, Rohini asked her parents to ask the boy to get his blood test report.
(i) Do you think it was right on the part of Rohini's parents to do so?
(ii) What moral values did Rohini showed?
(iii) Name two STDs along with their causative organisms.
How can one justify this statement that like physical, mental and social fitness, human beings need fitness for reproductive life', i.e. 'reproductive health'.
Read the given passage and answer the following questions:
(i) Why is 'reproductive health' important?
(ii) Study of birth control is a vital part of reproductive health education programme. Comment.
(iii) What value will the learners inter from this passage?
Arjun and Ram are students of class IX. Both were good in studies. However, after some time, academic performance of Arjun started declining and he started getting irritated quickly in his class. This change was noticed by his class teacher. While, interacting with Arjun, she found out that he had six siblings and whole family lived in a single room. Arjun's mother was not able to devote much attention to him and resources were also insufficient.
Read the given passage and answer the following questions:
(i) After going through the situation, what are the factors, you think, are responsible for change in behaviour and poor performance of
Arjun in studies?
(ii) What suggestions can be given before a couple start their families for a good life?
(iii) What value will the learners infer from this passage?
It is a well-known fact that pregnant woman's health is the backbone of every family and society.
Read the given passage and answer the following questions:
(i) Which tissue is responsible for providing nutrition from mother to growing embryo?
(i) According to you, what can be the likely measures to maintain woman's health during pregnancy?
(iii) What value will the learners infer from this passage?