Biology NEET - XII: Chapter 2- Sexual Reproduction in Flowering Plants Part 2
In Oenothera (evening primrose), the embryo sac is of the 4-celled, 4-nucleate type. It deviates from the typical 8-nucleate Polygonum type and contains one egg cell and two synergids at the micropylar end, and one antipodal cell at the chalazal end, with no central cell or polar nuclei, hence no double fertilization.
What type of embryo sac is found in oenothera?
4 celles and 4 nucleate
Key Terms
What type of embryo sac is found in oenothera?
4 celles and 4 nucleate
What are the cells found in embryo sac of oenothera?
Egg apparatus and 1 polar nucleus
What is monocliny?
Presence of both male and female sex organs in a flower
What is homogamy?
Maturation of male and female sex organs at the same time
Potato is dichogamous. True/false?
False.
| Potato is homogamous.
What is dichogamy?
Maturation of male and female sex organs at different times.
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| Term | Definition |
|---|---|
What type of embryo sac is found in oenothera? | 4 celles and 4 nucleate |
What are the cells found in embryo sac of oenothera? | Egg apparatus and 1 polar nucleus |
What is monocliny? | Presence of both male and female sex organs in a flower |
What is homogamy? | Maturation of male and female sex organs at the same time |
Potato is dichogamous. True/false? | False. | Potato is homogamous. |
What is dichogamy? | Maturation of male and female sex organs at different times. |
What is protandry in flowers? | Maturation of male sex organ before female sex organ |
What is prepotency? | On the stigma, pollen grains of other plants (of same species) mature faster than pollen grains same plant |
What is herkogamy? | Mechanical device which prevents self pollination |
What is heterostyly? | Vast difference between length of style of carpel and filament of anther. |
What is pollination by bats called? | Chireptoerophily |
What is pollination by snakes called? | Ophiophily |
What type of pollination if found in Cannabis? | Anemophily |
What type of pollination is found in potamogeton? | Anemophily |
What type of pollination is found in coconut and dates? | Anemophily |
What type of pollination is found in bamboo and sugarcane? | Anemophily |
Is anemophily a directional process? | No |
In which type of pollination, pollen grains have specific gravity lower than water? | Hydrophily |
In which type of pollination is the size of flowers and number of nectar glands maximum? | Ornithophily |
Adansonia is pollinated by | Bats |
Polysiphony is found in which family of plants? | Family malvaceae and family cucurbitaceae |
What type of movement is shown by pollen tube? | Chemotropic movement |
Where does the pollen tube enter the embryo sac in Betula and walnut? | Chalaza |
Where does the pollen tube enter the embryo sac in cucurbits? | Integuments |
Where does the pollen tube release the nuclei in embryo sac? | Cytoplasm of central cell |
When does the vegetative nucleus of pollen grain degenerate? | When the pollen tube touches the embryo sac |
How many nuclei are involved in double fertlization? | 5 (2 nuclei of pollen grain, 1 nucleus of egg cell, 2 pollen nuclei) |
What is the ploidy of endosperm in gymnosperms? | Haploid |
What does the funicle form after fertilization in plants? | Stalk of seed |
Testa of seed is formed from | Outer integument |
Tegment of seed is formed from | Inner integument |
Who is the father of Indian (plant) embryology? | P. Maheshwari |
What type of fission is the first division in embryogenesis in dicot plants? | Transverse fission |
Which cells are formed as a result of transverse fission in zygote in dicots? | Small apical cell and large basal cell |
What does the apical cell in the two celled stage of dicot plant embryogenesis form in future? | Hypocotyl, shoot apical meristem, and cotyledons |
What does the basal cell in the two celled stage of dicot plant embryogenesis form in future? | Hypophysis and suspensor |
What type of divisions take place in two celled stage to form eight celled stage in embryogenesis in dicots? | Two rounds of longitudinal division, and one round of transverse division |
What does the hypophysis of dicot embryo form? | Root cap |
What is the function of suspensor in dicot embryo? | Absorbs food from endosperm through haustorial cell and transfers it to the embryo |
What do the epibasal cells in octant stage of dicot embryo form in future? | Cotyledons and plumule |
What do the hypobasal cells in octant stage of dicot embryo form in future? | Radicle and hypocotyl |
Towards which side of embryonal axis is the sclutellum situated in monocot embryo? | Lateral side |
What does the epiblast represent in a monocot embryo? | Rudiments of second cotyledon |
In which seeds are the cotyledons thin and papery? | Albuminous/endospermic seeds |
Can perisperm develop in endospermic seeds? | No |
What is the type of germination in which cotyledons are pushed out of the soil by fast growth of hypocotyl called? | Epigeal germination |
What is the type of germination in which cotyledons remain in the soil by fast growth of epicotyl called? | Hypogeal germination |
What type of germination (hypogeal or epigeal) is found in most monocots? | Hypogeal germination |
What type of germination (hypogeal or epigeal) is found in castor? | Epigeal germination |
What type of germination (hypogeal or epigeal) is found in beans? | Epigeal germination |
Is polyembryony commonly found in gymnosperms or angiosperms? | Gymnosperms |
What is pseudopolyembryony? | Many embryos are formed from more than one embryo sac in an ovule |
What is true polyembryony? | Many embryos are formed from a single embryo sac. |
What is the ploidy of oosphere? | Haploid | [oosphere= egg] |
How many stamens are present in the flower of crotolaria? | 10 |