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प्रश्न
Nebenkern is ______.
विकल्प
acrosome of sperm
neck of sperm
middle piece of sperm
mitochondrion of sperm
उत्तर
Nebenkern is mitochondrion of sperm.
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संबंधित प्रश्न
Why is variation beneficial to the species but not necessarily for the individual?
What is the name of the reproductive process :
which involves only one parent?
Why are budding, fragmentation and regeneration, all considered to be asexual type of reproduction?
The method of asexual reproduction in plants in which callus is produced is :
What type of fertilisation takes place in birds?
Find the odd-one out, giving reason.
Gamete, budding, fragmentation, regeneration.
Give reason for the following:
Vegetative propagation is practised for growing only some type of plants.
Match the following:
| Column ‘I’ | Column ‘II’ |
|
(1) Inhibits plant growth
|
(a) Breaks large fat globules into smaller ones
|
|
(2) Cytokinins
|
(b) Auxins
|
|
(3) Cellular respiration
|
(c) Mitochondria
|
|
(4) Bile
|
(d) Promote cell division
|
|
(e) Abscisic acid
|
Answer the following question.
The growing size of the human population is a cause of concern for all people. The rate of birth and death in a given population will determine its size. Reproduction is the process by which organisms increase their population. The process of sexual maturation for reproduction is gradual and takes place while general body growth is still going on. Some degree of sexual maturation does not necessarily mean that the mind or body is ready for sexual acts or for having and bringing up children. Various contraceptive devices are being used by human beings to control the size of the population.
(a) List two common signs of sexual maturation in boys and girls.
(b) What is the result of reckless female foeticide?
(c) Which contraceptive method changes the hormonal balance of the body?
(d) Write two factors that determine the size of a population.
If diploid chromosome number in a flowering plant is 12, then which one of the following will have 6 chromosomes?
Multiple choice question.
In angiosperms, endosperm is formed by/ due to ______
The number of nuclei present in a zygote is _______.
Multiple choice question.
Which of these is the male reproductive organ in humans?
Draw a well labelled diagram of the monocot seed you have studied.
What is morula?
What are the causes for the extinction of animals?
Assertion and Reason types of Question.
Assertion: Corm is a condensed form of Bulb.
Reason: It has dry and fleshy scale leaves.
In a flower, the parts that produce male and female gametes (germ cells) are
How is reproduction in Hydra different from that in Amoeba?
