MEDIUM
Earn 100
Liquid nitrogen has a boiling point of -196C that is used as medicine in the removal of precancerous cells, warts, or unwanted skin, and as cryogenics by the researchers.
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Important Questions on Sexual Reproduction in Flowering Plants
HARD
When and where do tapetum and synergids develop in flowering plants? Mention their function.
MEDIUM
Choose the correct statement.
A) Several hormonal and structural changes are initiated for the development of floral primordium.
B) Each anther will have two sporangia at the sides.
C) Stomium will be useful for the dehiscence of pollen sacs.
D) Pollen grains can be stored at .
E) Pollen viability in rice will be days.
MEDIUM
Assertion Pollengrains are well preserved as fossils
Reason The exine of pollen grains is made up of sporopollenin, which can withstand high temperatures, strong acids and alkali.
HARD
Which of the following has proved helpful in preserving pollen as fossils?
EASY
Male gametophyte in angiosperms produces :
EASY
Draw a neat labelled diagram of T.S. of young Anther.
MEDIUM
Assertion Xenogamy involves transfer of pollen grains from the flower of one plant to the stigma of another plant.
Reason This is the only type of pollination which brings genetically different types of pollen grains to the stigma.
The correct answer is:
EASY
Among the following statements related to pollens, choose the correct one.
Statement : In of angiosperms pollen grains are shed at the —celled stage.
Statement : Intine is made of cellulose and pectin, and it is discontinuous with germ pores.
HARD
Which one of the following statements is not true?
EASY
Ubisch bodies are produced from ___.
EASY
Pollen grains can be stored for several years in liquid nitrogen having a temperature of
EASY
Which one of the following statements is not true?
HARD
Draw a diagram of a mature male gametophyte and label Pollen tube and Tube nucleus.
HARD
Draw a schematic transverse section of a mature anther of an angiosperm. Label its epidermis, middle layers, tapetum, endothecium, sporogenous tissue and the connective.
EASY
During an excavation of soil, pollen fossil were retrieved from deepest layer of soil. The pollen grains remained fossils because:
EASY
In angiosperms, the development of male gametophyte takes place from ___________.
EASY
When pollen grain is shed at the -celled stage, name the cells it contains.
EASY
If we explore anther wall from outside to inside then which sequence will be correct?
A- Endothecium
B- Tapetum
C- Epidermis
D- Middle Layer
EASY
Pollen tablets are available in the market for:
EASY
In Angiosperms, microsporogenesis and megasporogenesis:
