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प्रश्न
What is parthenogenesis? Give two examples from animals
उत्तर
Development of an egg into a complete individual without fertilization is known as parthenogenesis. It was first discovered by Charles Bonnet in 1745.
E.g. Honey bees, Aphis.
संबंधित प्रश्न
What are chromosomes?
How do organisms, whether reproduced asexually or sexually maintain a constant chromosome number through several generations? Explain with the help of suitable example.
Define Senescent phase.
Differentiate between internal fertilization and external fertilization.
Name two animals which reproduce sexually.
Name two plants which reproduce by sexual reproduction method and two plants which reproduce by asexual reproduction methods.
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
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
Define the term Puberty.
What is the function of uterus?
Multiple choice question. Tick (✓) the correct choice:
Which of the following glands is responsible for bringing about changes during adolescence in boys and girls?
- pituitary
- adrenal
- thyroid
- testis
Define the term Puberty.
Mention the common method of reproduction in Amoeba.
Describe the different methods of asexual reproduction in animals.
Meiosis is an essential event in the sexual life cycle of any organism. Give two reasons.
What is sexual reproduction? List its four significances.
“The chromosomes number of the sexually reproducing parents and their offspring is the same.” Justify this statement.
Answer the following question.
Explain the process of fertilization in humans.
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.
Explain the histological structure of testis.
Answer the following question.
Explain the histological structure of ovary in human.
How is juvenile phase different from reproductive phase?
Identify the correct sequence of events.
Oestrus cycle is seen in ______.
In ______ animals, the development of the embryo takes place inside the body.
Between an annual and a perennial plant, which one has a shorter juvenile phase? Give one reason.
