Description : Entry of pollen tube through micropyle is (a) chalazogamy (b) mesogamy (c) porogamy (d) pseudogamy.
Last Answer : (c) porogamy
Description : $ Meiosis is a requirements of sexual reproduction. ! Meiosis occurs in somatic cells.
Last Answer : $ Meiosis is a requirements of sexual reproduction. ! Meiosis occurs in somatic cells. A. If both As and R ... is wrong D. If both As and R are wrong.
Description : Which of the following statements is not correct? (a) Pollen germination and pollen tube growth are regulated by chemical components of pollen interacting with those of the pistil. (b) ... Insects that consume pollen or nectar without bringing about pollination are called pollen/ nectar robbers.
Last Answer : (c) Pollen grains of many species can germinate on the stigma of a flower, but only one pollen tube of the same species grows into the style.
Description : In gymnosperms, the pollen chamber represents (a) a cavity in the ovule in which pollen grains are stored after pollination (b) an opening in the megagametophyte through which the pollen tube approaches the ... pollen grains develop (d) a cell in the pollen grain in which the sperms are formed.
Last Answer : (c) the microsporangium in which pollen grains develop
Description : $ Fertilization with the help of a pollen tube is called Siphonogamy. ! Entry of pollen tube into the ovule through integuments is called Mesogamy.
Last Answer : $ Fertilization with the help of a pollen tube is called Siphonogamy. ! Entry of pollen tube into the ovule ... wrong D. If both As and R are wrong.
Description : Which one of the following statements is correct? (a) Cleistogamous flowers are always autogamous. (b) Xenogamy occurs only by wind pollination. (c) Chasmogamous flowers do not open at all. (d) Geitonogamy involves the pollen and stigma of flowers of different plants.
Last Answer : (a) Cleistogamous flowers are always autogamous.
Description : What type of pollination takes place in Vallisneria? (a) Pollination occurs in submerged condition by water. (b) Flowers emerge above surface of water, and pollination occurs by insects. (c) Flowers ... wind. (d) Male flowers are carried by water currents to female flowers at surface of water.
Last Answer : (d) Male flowers are carried by water currents to female flowers at surface of water
Description : $ Zygotic meiosis occurs at the time of germination of zygote. ! Zyogote may be diploid or triploid
Last Answer : $ Zygotic meiosis occurs at the time of germination of zygote. ! Zyogote may be diploid or triploid A. If ... is wrong D. If both As and R are wrong.
Description : Consider the following statements about pollination. 1. Transfer of pollen grains from the anther to ovules in the same flower or a different f lower is called pollination. 2. The pollination by wind is called anemophily. 3. Pollination is a ... 1 and 3 (b) 1, 2 and 4 (c) Only 2 (d) 1, 2, 3 and 4
Last Answer : Ans:(c)
Description : The transfer of pollen grains from anther to stigma is called; a) Fertilization b) pollination c) Microsporogenesis d) Polyembryony
Last Answer : Ans. b) Pollination
Description : Which pollination reduces pollen loss ?
Last Answer : Self pollination reduces pollen loss.
Last Answer : As a result of pollination, pollen is transferred to the cervix.
Description : The floral part that receives pollen grains during pollination is - (1 ovary (2) style (3) stigma (4) ovules
Last Answer : (3) stigma Explanation: The stigma is the receptive tip of a carpel, or of several fused carpels, in the gynoecium of a flower. The stigma receives pollen at pollination and it is on the stigma that the pollen grain germinates. The style connects the stigma to the ovary.
Description : When pollen of a flower is transferred to the stigma of another flower of the same plant, the pollination is referred to as (a) autogamy (b) geitonogamy (c) xenogamy (d) allogamy.
Last Answer : b) geitonogamy
Description : In Angiosperms, during pollination, the pollen grains are mostly
Last Answer : In Angiosperms, during pollination, the pollen grains are mostly – Bicellular
Description : The floral part that receives pollen-grains during pollination is (1) ovary (2) style (3) stigma (4) ovules
Last Answer : stigma
Description : In an angiosperm, how many microspore mother cells are required to produce 100 pollen grains? (a) 75 (b) 100 (c) 25 (d) 50
Last Answer : (c) 25
Description : In angiosperms, pollen tube liberate their male gametes into the (a) central cell (b) antipodal cells (c) egg cell (d) synergids.
Last Answer : d) synergids.
Description : $ Pollination by insects is called self pollination. ! Cross pollination is between two genetically similar flowers.
Last Answer : $ Pollination by insects is called self pollination. ! Cross pollination is between two genetically similar flowers ... D. If both As and R are wrong.
Description : $ Self pollination in bud condition of a flower is called cleistogamy. ! Cleistogamy is usually accompanied by geocarpy.
Last Answer : $ Self pollination in bud condition of a flower is called cleistogamy. ! Cleistogamy is usually accompanied by ... D. If both As and R are wrong.
Description : Meiosis occurs in which cells?
Last Answer : Reproductive cell
Description : What occurs in meiosis? How is the chromosome number of daughter cells different?
Last Answer : •Gametes are produced by a variation of cell division called meiosis •Meiosis yields nonidentical daughter cells that have only one set of chromosomes, half as many as the parent cell
Description : $ Flower of Rafflesia is largest sized. ! Large flowers have wind pollination
Last Answer : $ Flower of Rafflesia is largest sized. ! Large flowers have wind pollination A. If both As and R are ... is wrong D. If both As and R are wrong.
Description : Pollination and fertilization occurs before opening of flower is termed as
Last Answer : Ans. Cleistogamy
Description : When a diploid embryosac is formed from a megaspore mother cell without meiosis, it is called as
Last Answer : When a diploid embryosac is formed from a megaspore mother cell without meiosis, it is called as – Diplospory
Description : Water supply through pipelines and tube wells to farm is known as a. fertilization b. hydration c. irrigation d. pollination
Last Answer : c. irrigation
Description : In angiosperms regarding development of microgametophyte each microspore mother cell undergoes (a) Mitosis to produce 4 microspores (b) Two successive mitosis to form 4 microspores (c) Two successive meiotic division to form 4 microspores (d) Meiosis to produce 4 haploid microspores
Last Answer : Ans. ((d))
Description : 4.A mature embryosac in angiosperm is formed from a megaspore mother cell by ------- cell divisions. (a) one mitosis and two meiosis, b)two mitosis and one meiosis, c)three mitosis and two meiosis d)three mitosis and one meiosis)
Last Answer : d)three mitosis and one meiosis)
Description : Polyploidy level of testa and pollen mother cell of seed
Last Answer : Ans. 2n
Description : Male gametophyte of angiosperms is shed at (a) four celled pollen grain (b) three celled pollen grain (c) microspore mother cell (d) anther.
Last Answer : b) three celled pollen grain
Description : In grasses what happens in microspore mother cell for the formation of mature pollen grains? (a) One meiotic and two mitotic divisions (b) One meiotic and one mitotic divisions (c) One meiotic division (d) One mitotic division
Last Answer : (b) One meiotic and one mitotic divisions
Description : Which one of the following is surrounded by a callose wall? (a) Male gamete (b) Egg (c) Pollen grain (d) Microspore mother cell
Last Answer : (d) Microspore mother cell
Description : Factors which stimulate pollen tube germination. -Biology
Last Answer : answer:
Description : What is a pollen tube? -Biology
Description : What stimulates the pollen tube to grow? -Biology
Description : Function of pollen tube? -Biology
Description : Why is the growth of a pollen tube important? -Biology
Description : What is the function of the pollen tube? -Biology
Description : Growth of pollen tube. -Biology
Description : Pollen tube attraction near ovule is facilitated by -Biology
Description : What makes a pollen tube ?
Last Answer : The pollen tube produces sperm cells.
Description : What is the name of the big cell in the pollen tube ?
Last Answer : The large cell in the pollen tube is the duct cell
Description : In tissue culture medium, the embryoids formed from pollen grains is due to (a) cellular totipotency (b) organogenesis (c) double fertilization (d) test tube culture.
Last Answer : (a) cellular totipotency