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प्रश्न
Define Senescent phase.
उत्तर
Senescent phase: It begins from the end of the reproductive phase. During this phase of life span, there is progressive deterioration in the body (like slowing of metabolism, etc.). Old age ultimately leads to death.
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संबंधित प्रश्न
Name two main processes of sexual reproduction
Define Juvenile phase,
What is amphimixis?
Each sperm is a single cell.
A new human individual develops from a cell called gamete.
In which female reproductive organ does the embryo get embedded?
Explain how, in sexually reproducing organisms, the number of chromosomes in the progeny is maintained.
Which species is likely to have better chances of survival - the one reproducing asexually or the one reproducing sexually? Justify your answer.
Name the organ which produces female sex cells.
Fill in the following blank with suitable word :
The cells involved in sexual reproduction are called .............
In which sort of reproduction are gametes involved?
What is this act of fusion called?
Give reason for the following:
The parents and off-springs of organisms reproducing sexually have the same number of chromosomes.
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
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:
Sexual reproduction and asexual reproduction.
Find the odd one out, give reason:
Testes, epididymis, uterus, vas deferens
Mention the functions of Oviduct.
Meiosis is an essential event in the sexual life cycle of any organism. Give two reasons.
What are seasonal breeders? Give an example.
Answer in one sentence.
Outline the path of sperm upto the urethra.
Answer in one sentence.
Enlist the external genital organs in the female.
Answer the following question.
Which is the function of male accessory glands?
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.
What is atresia with respect to ovary in human females?
Animals which give birth to young ones directly are named as ______.
Animals giving birth to young ones: ______
Name the phenomenon where the female gamete directly develops into a new organism with an avian example.
Which of the following is the male accessory gland?
Identify the INCORRECT statement.
In sexual reproduction, offsprings resemble the parents ______.
Sexual reproduction can be grouped into ______ distinct states.
______ fertilisation takes place in frogs and fish.
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 ______.
In ______ animals, the development of the embryo takes place inside the body.
Sexual reproduction is characterized by ______
