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प्रश्न
Sporoderm is made up of ______.
विकल्प
exosporium and endosporium
outer integuments and inner integument
testa and tegmen
exine and intine
उत्तर
Sporoderm is made up of exine and intine.
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संबंधित प्रश्न
Which life process ensures that a plant or animal species will not disappear from this earth?
What is a clone? Why do offsprings formed by asexual reproduction exhibit remarkable similarity?
What are the two general methods of reproduction in organisms?
Reproduction is essential for living organisms in order to ______
Name two animals which undergo internal fertilisation?
Differentiate between the following:
Asexual reproduction and sexual reproduction.
Match the following:
| Column ‘I’ | Column ‘II’ |
|
(1) Inhibits plant growth
|
(a) Breaks large fat globules into smaller ones
|
|
(2) Cytokinins
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(b) Auxins
|
|
(3) Cellular respiration
|
(c) Mitochondria
|
|
(4) Bile
|
(d) Promote cell division
|
|
(e) Abscisic acid
|
Explain the term: Pollination.
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.
Multiple choice question.
Insect pollinated flowers usually posses ______
Explain heterostyly and herkogamy with suitable example.
Which of the following is not a part of the uterus?
Nebenkern is ______.
Nervous system develops from ______ of embryonic layer.
What is morula?
Planaria reproduces asexually by ______.
Name two organisms that reproduce through budding.
How is reproduction in Hydra different from that in Amoeba?
Which of the following nucleus is unlike other nuclei in the female gametophyte of angiosperms?
