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प्रश्न
Assertion: Sporopollenin preserves pollen in fossil deposits
Reason: Sporopollenin is resistant to physical and biological decomposition
पर्याय
assertion is true; reason is false
assertion is false; reason is true
Both Assertion and reason are not true
Both Assertion and reason are true
उत्तर
Assertion is false; reason is true
संबंधित प्रश्न
Differentiate between outbreeding and outcrossing.
During double fertilization second male gamete fuses with ___________.
Match the items in Column A with those in Column B.
|
Column A |
Column B |
|
(a) Generative nucleus |
(i) Pollen tube |
|
(b) Germ pore |
(ii) Endosperm nucleus |
|
(c) Exine |
(iii) Testa |
|
(d) Secondary nucleus |
(iv) Fertilization |
|
(e) Integument |
(v) Male nuclei |
|
(f) Egg nucleus |
(vi) Rough |
What is ‘double fertilization’? Describe it with the help of a neat and well-labeled diagram. Give its importance.
What is the significance of the dispersal of seeds? Give any two points.
What is the function of pollen tube? Explain with the help of a diagram.
The question has four options. Choose the correct answer:
When only ovary forms fruits they are known as
Long Answer Question:
Draw a labeled diagram of the L.S. of anatropous ovule and list the components of the embryo sac and mention their fate after fertilization.
Pollen tube was discovered by
The correct order of haploid, diploid, and triploid structure in fertilized embryo sac is
Transmitting tissue is found in
Explain the development of a Dicot embryo
Which of the following happens during triple fusion?
In double fertilization, the first male gamete fuses with the egg and the second male gan1ete fuses with which of the following?
Identify the CORRECT statement with reference to cellular endosperm.
Double fertilization is fusion of ______.
______ have the smallest seeds in the plant kingdom.
All the events from pollen deposition on the stigma until pollen tubes enter the ovules are together referred to as ______.
What is the function of the two male gametes produced by each pollen grain in angiosperms?
