What is the function of filiform apparatus in an angiospermic embryo sac? (a) Brings about opening of the pollen tube (b) Guides the pollen tube into a synergid (c) Prevents entry of more than one pollen tube into a synergid (d) None of these
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A: Introduction We will answer the question in below step
What is the function of filiform apparatus in an
(a) Brings about opening of the pollen tube
(b) Guides the pollen tube into a synergid
(c) Prevents entry of more than one pollen tube into a synergid
(d) None of these
Step by step
Solved in 2 steps
- The part of gynoecium that determines the compatible nature of pollen is: (a) stigma (b) style (c) ovary (d) synergidsWhere in an angiosperm would you finda megasporangium?(A) in the style of a flower(B) enclosed in the stigma of a flower(C) within an ovule contained within an ovaryof a flower(D) packed into pollen sacs within the anthers found on astamenGrowth of pollen tube towards embryo sac is (a) chemotropic (b) thigmotaxis (c) geotropic (d) none of these
- Plants and animals originated in water environments and, much later, plants invaded the land and later still, animals invaded the land. a) With respect to the four groups of plants (Bryophytes, seedless vascular plants, Gymnosperms, and Angiosperms), give the basic method of fertilization. That is, how do the sperm reach the eggs? b) What is the significance of the fertilization methods to the invasion of the land by the Gymnosperms and Angiosperms?Why are gymnosperms nicknamed "naked seeds?" Because they originate from an egg cell only, rather than an egg cell and a sperm cell. Because they are not encased by the mature ovary. Because they originate from a sperm cell only, rather than an egg cell and a sperm cell. Because they are encased by a protective sheath.Cleistogamous flowers are invariably autogamous because” (a) These flowers do not open at all. (b) There is no chance of cross – pollen landing on the stigma. (c) These flowers have exposed anthers and stigma. (d) These flowers are wind pollinated.
- Draw a diagram of L.S. of an anatropous ovule of an Angiosperm & label the following parts :- (i) Nucellus (ii) Integument (iii) Antipodal cells (iv) Secondary Nucleus.Your class is studying the burrs – the seed pods – of the common burdock plant. Your lab partner notices that the burrs easily cling to clothing, as well as to each other, and that some of the spines have come loose and gotten stuck in her skin, which is somewhat painful. Based on these observations, is there a logical explanation, other than reproductive success, for why the seed might have this special structure? (a) Yes, the structure may help the seed cling to the soil so that it can take root more easily (b) yes, these structures may prevent the seeds from getting damaged or eaten by other animals (c) yes, the structures may help prevent the seeds from getting pulled from the plant by sticking to each other (d) No, they are obviously intended to attach to animals so that they can be carried and dropped elsewhereGymnosperms and angiosperms have the following incommon except(A) seeds.(B) pollen.(C) ovaries.(D) ovules.
- Which structure produces and stores pollen? (A) stigma (B) style (C) anther (D) ovaryIn which part of the flower does both meiosis and fertilization occur? (A) anther (B) filament (C) ovule (D) stigmaMotile sperm cells are found as vestiges in these two gymnosperm groups: (a) monocots, eudicots (b) gnetophytes, conifers (c) gnetophytes, flowering plants (d) cycads, conifers (e) cycads, ginkgo