otile 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
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Motile sperm cells are found as vestiges in these two gymnosperm groups: (a)
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- Which of the following is not a characteristic that distinguishesgymnosperms and angiosperms from other plants?(A) dependent gametophytes(B) ovules(C) pollen(D) alternation of generationsGymnosperms and angiosperms have the following incommon except(A) seeds.(B) pollen.(C) ovaries.(D) ovules.11. The scales of pine cones are (a) always green. (b) modified roots. (c) modified leaves. (d) modified stems. 12. Plants that make flowers are called (a) gymnosperms. (b) byrophytes. (c) gametophytes. (d) angiosperms. 13. The class of plants that has vascular tissue and reproduces with spores is the (a) clubmosses. (b) liverworts. (c) flowering plants. (d) conifers. 14. The embryonic stem in a seed is called the (a) radicle. (b) hypocotyl. (c) seed cont. (d) endosperm. 15. Pollen contains (a) male gametes. (b) female gametes. (c) fruits. (d) a stigma.
- The part of gynoecium that determines the compatible nature of pollen is: (a) stigma (b) style (c) ovary (d) synergidsWhat 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 theseGrowth of pollen tube towards embryo sac is (a) chemotropic (b) thigmotaxis (c) geotropic (d) none of these
- 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.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?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.
- 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.The stamens represent: (a) microsporangia (b) male gametophyte (c) male gametes (d) microsporophylls.With respect to angiosperms, which of the followingis incorrectly paired with its chromosome count?(A) egg—n(B) megaspore—2n(C) microspore—n(D) zygote—2n