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प्रश्न
What is meant by sexual reproduction?
What is sexual reproduction?
उत्तर
Sexual reproduction: The process of reproduction which involves the fusion of two gametes for the production of a young one is called sexual reproduction.
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संबंधित प्रश्न
No two individuals are absolutely alike in a population. Why?
How do organisms, whether reproduced asexually or sexually maintain a constant chromosome number through several generations? Explain with the help of suitable example.
Define Juvenile phase,
What is amphimixis?
The number of nuclei present in a zygote is ______.
Oviparous animals give birth to young ones.
Differentiate between internal fertilization and external fertilization.
Difference between an annual and biennial plants. Provide one example of each.
Name two animals which reproduce sexually.
name the organ which produces male sex cells.
Describe the various steps involved in the sexual reproduction in animals. Draw labelled diagrams to show the fertilisation of an ovum (or egg) by a sperm to form a zygote
Name two plants which reproduce by sexual reproduction method and two plants which reproduce by asexual reproduction methods.
What would be the ratio of chromosome number between an egg and its zygote?
The advantage that internal fertilisation has over external fertilisation is that in internal fertilisation :
(a) new off-springs are exactly like the parent
(b) production of large numbers of gametes is unnecessary
(c) copulation and fusion of gametes is passive
(d) fewer individuals are produced
The figure given alongside shows the human male reproductive organs. Which structures make sperms and seminal fluid?
(a) V makes sperms and X makes seminal fluid
(b) W makes sperms and Y makes seminal fluid
(c) X makes sperms and W makes seminal fluid
(d) Y makes sperms and V makes seminal fluid
What is the function of uterus?
Mention the common method of reproduction in Hydra.
Mention the common method of reproduction in Flatworm.
Mention the common method of reproduction in Start fish.
Name the organ involved in the following:
Passing of sperms from a man to a woman.
Adolesecence is considered a critical stage in the life of boys and girls. Explain this statement.
Describe the various stages in the life cycle of a butterfly.
Meiosis is an essential event in the sexual life cycle of any organism. Give two reasons.
Answer the following question.
Explain the process of fertilization in humans.
Answer in one sentence.
Enlist the external genital organs in the female.
Long answer question.
Describe female reproductive system of human.
Describe the histology of testis with help of labelled diagram.
Identify the labels from the given diagram.
Give reason for the following:
Some organisms like honey bees are called parthenogenetic animals
Match column -1 with column - II and select the correct option.
| Column - I | Column - II | ||
| 1. | Seminal vesicles | a. | Membranous urethra |
| 2. | Scrotum | b. | Thermoregulatory |
| 3. | Tunica vaginalis | c. | Fibro muscular pouches |
| 4. | Cowper's gland | d. | Peritoneal covering |
In sexual reproduction, offsprings resemble the parents ______.
Oestrus cycle is seen in ______.
Characters that are transmitted from parents to offspring during reproduction show ______
Animals in which an embryo develops outside the body are called ______ animals.
The eggshell protects the ______ from the outer environment.
With which type of reproduction do we associate the reduction division? Analyse the reasons for it.
Differentiate between oestrus and menstrual cycles. Cite an example for each type.
