Male Gametophyte
Trending Questions
Discuss the advantages and disadvantages of hybrid seeds?
- Tapetum
- Endothecium
- Middle layer
- Endothelium
- Seed formation is not dependent on water
- Seeds have food reserves for the nourishment of the embryo
- Seed coat provides protection to the embryo
- All of the above.
- exine, cellulose
- intine, pectin
- intine, cellulose and pectin
- exine, sporopollenin
Reason: The presence of fibrous bands and differential expansion of inner and outer tangential walls of endothecial cells cause dehiscence of anther.
- Both assertion and reason are true and reason is the correct
explanation of assertion - Both assertion and reason are true but reason is not the correct explanation of assertion
- Assertion is true but reason is false
- Both assertion and reason are false
(a) The vegetative cell of pollen grain divides to form the male gametes.
(b) Sporopollenin is absent in the germ pores.
(c) Intine of pollen grains is made up of cellulose and pectin.
(d) Pollen grains represent the male gametophyte.
- a, b, c and d
- a, b and d
- b, c and d
- a, c and d
I. Pollen grains are the male gametes of the flowering plant.
II. Pollen grain has a prominent two-layered wall.
III. The outer thick wall of pollen grain is called exine and the inner thin wall is called intine.
IV. The hard outer layer called the exine is made up of sporopollenin which is one of the most resistant organic materials known.
- I, II and IV are correct
- II, III and IV are correct
- I, II and III are correct
- All are correct
- Diploid
- Polyploid
- Triploid
- Haploid.
Reason: The outer layer of pollen grains called the exine is made up of sporopollenin.
- Both assertion and reason are true but reason is not the correct explanation of assertion.
- The assertion is true but reason is false.
- Both assertion and reason are false.
- Both assertion and reason are true and reason is the correct explanation of assertion.
- 8, 8, 12, 36
- 12, 12, 12, 36
- 12, 12, 12, 72
- 12, 12, 24, 36
The endosperm in angiosperm develops from
Zygote
Chalazal polar nucleus
Secondary nucleus
Micropyler polar nucleus
Parthenium came to India as a seed contaminant along with:
Rice
Maize
None of the above
Wheat
What is an anti-transpirant ? Name some anti-transpirants.
In gymnosperm the pollen chamber represents?
Microsporangium in which pollen grains develop
A cavity in the ovule in which pollen grains are stored after pollination
A cell in the pollen grain in which the sperms are formed
An opening in the megagametophyte through which the pollen tube approaches the egg
- Intine is a thick, non-continuous inner layer of pollen grain.
- Exine of pollen grains is made up of sporopollenin.
- Most species of pollen grains can cause allergic reactions
- Pollen grains can be stored in liquid nitrogen.
- In angiosperms and gymnosperms, various biotic and abiotic pollinators are required for pollination, while bryophyte and pteridophyte require specifically water for transfer of male gamete to female gamete.
- In angiosperms the sperm cells are produced in the pollen grain whereas in the rest they are produced in the antheridium.
- In angiosperms and gymnosperms the sperm cells are non-motile whereas in the rest they are flagellated.
- In angiosperms and gymnosperms, pollen contains sporopollenin, while in bryophytes and pteridophytes, sporopollenin is absent.
- Tapetum-nourishes the pollen grains
- germ pore-sporopollenin
- Intine-cellulose and pectin
- none of the above
- Acropetal order
- Centrifugal order
- Centripetal order
- Basipetal order
Which of the following statements is correct regarding sporopollenin?
Sporopollenin is made up of inorganic materials
Sporopollenin can be degraded by enzymes
Sporopollenin can withstand high temperatures but not strong acids
Sporopollenin can withstand high temperatures as well as strong acids and alkalis
- wall of microsporangium
- cytoplasm of vegetative cell of pollen grain
- intine of pollen wall
- exine of pollen wall
Spermology is the study of
Seed
Leaf
Fruit
Pollen grain
- They are used as food supplements
- They increase the performance of athletes and race horses
- They are used for pollination
- Both a and b
- Hilum
- Filiform apparatus
- Micropyle
- None of these
- Bryophyllum
- Parthenium
- orchids
- None of these
- is formed after fertilization
- is formed before fertilization while the latter is formed after fertilization
- is cellular while the latter is nuclear
- is nutritive while the latter is protective
- Germ pore
- Vegetative pore
- Sex pore
- Generative pore
- 4
- 6
- 8
- 10
- They are used as food supplements.
- They increase the performance of athletes and race horses.
- They are used for pollination
- Both a and b