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प्रश्न
Which are the components of pollination?
उत्तर
Pollination occurs with the help of abiotic agents like wind, water and biotic agents like insects and other animals.
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संबंधित प्रश्न
Which mode of reproduction gives rise to variation?
List three distinguish features between sexual and asexual types of reproduction, in tabular form.
How does reproduction help in providing stability to populations of species?
What is amphimixis?
Differentiate between internal fertilization and external fertilization.
Difference between an annual and biennial plants. Provide one example of each.
What is the other name of sex cells?
Define sexual reproduction.
name the organ which produces male sex cells.
Name two plants which reproduce by sexual reproduction method and two plants which reproduce by asexual reproduction methods.
Distinguish between a gamete and a zygote.
Put a tick mark (✓) against the correct alternative in the following statement:
Amoeba is most commonly reproduced by:
Put a tick mark (✓) against the correct alternative in the following statement:
Which one of the following represents the correct sequence in the life history of a butterfly ?
- Egg → Larva → Adult → Pupa
- Egg → Pupa → Adult → Larva
- Egg → Larva → Pupa → Adult
- Egg → Pupa → Larva → Adult
Distinguish between the following pair of terms:
Budding and Regeneration.
Define the term Puberty.
Find the odd one out, give reason:
Testes, epididymis, uterus, vas deferens
Define the term Adolescence.
Define the term Metamorphosis.
“The chromosomes number of the sexually reproducing parents and their offspring is the same.” Justify this statement.
Answer the following question.
It is commonly observed that parents feel embarrassed to discuss freely with their adolescent children about sexuality and reproduction. The result of this parental inhibition is that the children go astray sometimes.
Explain the reasons that you feel are behind such embarrassment amongst some parents to freely discuss such issues with their growing children.
Answer the following question.
Explain the following parts of male reproductive system along with labelled diagram showing these parts- Testis, vasa deferentia, epididymis, seminal vesicle, prostate gland and penis.
Long answer question.
Describe female reproductive system of human.
Give an account of external genitalia in human females.
Write an account of the seminal vesicle and bulbourethral gland in the male reproductive system.
What are the different stages of sexual reproduction?
Give reason for the following:
A male honey bee has 16 chromosomes whereas a female has 32 chromosomes.
Differentiate between the following:
Regeneration in lizard and Planaria
In an ovule, meiosis occurs in ______
Testosterone is produced by ____________.
Identify the INCORRECT statement.
The end of vegetative phase in plants which marks the beginning of the reproductive phase can be easily seen in the higher plants when they come to ______.
Choose the correct answer from the options given below:
Which of the following statements, support the view that elaborate sexual reproductive process appeared much later in the organic evolution.
- Lower groups of organisms have simpler body design
- Asexual reproduction is common in lower groups
- Asexual reproduction is common in higher groups of organisms
- The high incidence of sexual reproduction in angiosperms and vertebrates
The zygote divides repeatedly into a group of cells, which develops into different tissues and organs constituting a full body. This structure is known as ______.
______ lay thousands and sometimes millions of small, soft eggs in water.
Explain the two types of fertilization.
Reproduction is essentially a phenomenon that is not for survival of an individual but for the stability of a species. Justify.
Explain how stability of the DNA of the species is ensured in sexually reproducing organisms.
