Description : Generative cell was destroyed by laser but a normal pollen tube was still formed because (a) vegetative cell is not damaged (b) contents of killed generative cell stimulate pollen growth (c) laser beam stimulates growth of pollen tube (d) the region of emergence of pollen tube is not harmed.
Last Answer : (a) vegetative cell is not damaged
Description : Factors which stimulate pollen tube germination. -Biology
Last Answer : answer:
Description : What is a pollen tube? -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 causes a green plant exposed to the light, on only one side, to bend towards the source of light as it grows? (a) Light stimulates plant cells on the lighted side to grow ... Green plants need light to perform photosynthesis. (d) Green plants seek light because they are phototropic.
Last Answer : (b) Auxin accumulates on the shaded side, stimulating greater cell elongation there
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 : $ Pollination with the help of a pollen tube is called porogamy. ! Pollination occurs before meiosis of pollen mother cells.
Last Answer : $ Pollination with the help of a pollen tube is called porogamy. ! Pollination occurs before meiosis of ... wrong D. If both As and R are wrong.
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 : 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
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 : Through which cell of the embryo sac, does the pollen tube enter the embryo sac? (a) Egg cell (b) Persistant synergid (c) Degenerated synergids (d) Central cell
Last Answer : c) Degenerated synergids
Description : Double fertilisation is (a) fusion of two male gametes of a pollen tube with two different eggs (b) fusion of one male gamete with two polar nuclei (c) fusion of two male gametes with one egg (d) syngamy and triple fusion.
Last Answer : (d) syngamy and triple fusion.
Description : Entry of pollen tube through micropyle is (a) chalazogamy (b) mesogamy (c) porogamy (d) pseudogamy.
Last Answer : (c) porogamy
Description : What does the filiform apparatus do at the entrance into ovule? (a) It brings about opening of the pollen tube. (b) It guides pollen tube from a synergid to egg. (c) It helps in the entry of pollen tube into a synergid. (d) It prevents entry of more than one pollen tube into the embryo sac
Last Answer : (b) It guides pollen tube from a synergid to egg.
Description : What is the function of germ pore? (a) Emergence of radicle (b) Absorption of water for seed germination (c) Initiation of pollen tube (d) Release of male gametes
Last Answer : (c) Initiation of pollen tube
Description : Function of filiform apparatus is to (a) recognise the suitable pollen at stigma (b) stimulate division of generative cell (c) produce nectar (d) guide the entry of pollen tube.
Last Answer : (d) guide the entry of pollen tube.
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 : Chlorenchyma is known to develop in the (a) cytoplasm of Chlorella (b) mycelium of a green mould such as Aspergillus (c) spore capsule of a moss (d) pollen tube of Pinus.
Last Answer : (c) spore capsule of a moss
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 : Double fertilization is (1) Fusion of two male gametes of a pollen tube with two different eggs (2) Fusion of one male gamete with two polar nuclei (3) Fusion of two male gametes with one egg (4) Syngamy and triple fusion
Last Answer : (4) Syngamy and triple fusion
Description : When embryosac receives two or more than two pollen tubes the sperm nucleus fusing with the egg nucleus may be derived from one pollen tube and one fusing with the polar nuclei may be derived from other pollen tube, the phenomenon is termed as
Last Answer : When embryosac receives two or more than two pollen tubes the sperm nucleus fusing with the egg nucleus may be derived from one pollen tube and one fusing with the polar nuclei may be derived from other pollen tube, the phenomenon is termed as – Heterofertilization
Description : Which of the following nourishes a developing seed? a) pollen tube b) nectar c) endosperm d) zygote
Last Answer : ANSWER: C -- ENDOSPERM
Description : Failure of a viable pollen to grow down the style of the flower of the same variety is called ___________: a. Self sterility b. Self incompatibility c. Self unfruitfulness d. Sterility
Last Answer : Self incompatibility
Description : What stimulates pituitary to release the hormone responsible for parturition? Name the hormone -Biology
Last Answer : Foetal ejection reflex stimulates pituitary to release the oxytocin hormone, which is responsible for parturition.
Description : What is erythropoiesis? Which hormone stimulates it? -Biology
Description : What does gibberellin stimulates in plants? -Biology
Description : What plant hormone stimulates cell division? -Biology
Description : Assertion: Epstein - Barr virus is an oncovirus. Reason: It stimulates the growth of cancer.
Last Answer : Assertion: Epstein - Barr virus is an oncovirus. Reason: It stimulates the growth of cancer. A. If ... D. If both the assertion and reason are false
Description : The hormone that stimulates heart beat is
Last Answer : The hormone that stimulates heart beat is A. Insulin B. Adreanaline C. Glucagon D. Gastrin
Description : Secretin hormone stimulates `:`
Last Answer : Secretin hormone stimulates `:` A. Gastric glands B. Pancreas C. Gall bladder D. Crypts of Lieberkuhn
Description : Gastro-intestinal hoemone that stimulates insulin secretion is
Last Answer : Gastro-intestinal hoemone that stimulates insulin secretion is A. Gastrin B. C C K C. Secretin D. GIP
Description : Secretin stimulates production of
Last Answer : Secretin stimulates production of A. Pancreatic juice B. Intestinal juice C. Salvary juice D. Gastric juice
Description : Enterokinase stimulates which of the following `:-`
Last Answer : Enterokinase stimulates which of the following `:-` A. Pepsinogen B. trypsin C. Pepsin D. Trypsinogen
Description : The hormone which acts on Sertoli cells and stimulates the process of spermaogenesis is :
Last Answer : The hormone which acts on Sertoli cells and stimulates the process of spermaogenesis is : A. LH B. FSH C. Androgen D. GnRH.
Description : Low level of progesterone and estrogen stimulates production of
Last Answer : Low level of progesterone and estrogen stimulates production of A. FSH-RH B. LH C. GH D. All the above