Genus Cordaites is an extinct plant from category of a. Conifers b. Cycads c. Angiosperms d. Pteridophytes

Genus Cordaites is an extinct plant from category of
a. Conifers
b. Cycads
c. Angiosperms
d. Pteridophytes
by

1 Answer

Answer :

a. Conifers
by

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Top-shaped multiciliate male gametes and the mature seed which bears only one embryo with two cotyledons, are characterised features of (a) cycads (b) conifers (c) polypetalous angiosperms (d) gamopetalous angiosperms.

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Cordaites (pron: kor-day-i-tees) were the ancestor of one of the following. Were they primitive: w) amphibians x) cone-bearing trees y) snakes z) sharks

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Economic importance of pteridophytes. -Biology

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Pteridophytes reproduction. -Biology

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Heterospory in pteridophytes? -Biology

Description : Heterospory in pteridophytes? -Biology

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$ Cryptogams are those plants which have large sized sex organs. ! Pteridophytes are the cryptogams without embryo formation.

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Description : Mention one example each of aquatic and xerophytic pteridophytes.

Last Answer : Mention one example each of aquatic and xerophytic pteridophytes.

Write economic importance of Pteridophytes.

Description : Write economic importance of Pteridophytes.

Last Answer : Write economic importance of Pteridophytes.

Compare the gametophyte and sporophyte of Bryophytes with that of Pteridophytes.

Description : Compare the gametophyte and sporophyte of Bryophytes with that of Pteridophytes.

Last Answer : Compare the gametophyte and sporophyte of Bryophytes with that of Pteridophytes.

Our major foods, fibres, spices, fruits and beverage crops are (a) Flowering plants (b) Gymnospermous plants (c) Pteridophytes (d) Bryophytes

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The independent structure developed in pteridophytes which produces male and female gametes is

Description : The independent structure developed in pteridophytes which produces male and female gametes is

Last Answer : Prothallus.

What is the significant characteristic acquired by pteridophytes in the process of evolution? Give 2 examples of pteridophytes.

Description : What is the significant characteristic acquired by pteridophytes in the process of evolution? Give 2 examples of pteridophytes.

Last Answer : The significant characteristic acquired by pteridophytes is vascular tissues (xylem and phloem). Ex: Nephrolepis, Selaginella, Adiantum, Lycopodium, Marsilea

Mention the economic importance of pteridophytes/ferns.

Description : Mention the economic importance of pteridophytes/ferns.

Last Answer : a) Ferns are grown for their ornamental value. b) Leaves of pteridophytes are used in making flower bouquet. c) Some ferns are of medicinal importance. d) Some ferns like horse-tail and club mosses are involved in the formation of fossil fuels like coal and petroleum.

Explain alternation of generations in pteridophytes.

Description : Explain alternation of generations in pteridophytes.

Last Answer : The process by which gametophyte and sporophyte formed alternately during the life cycle is called alternation of generations. The life cycle of pteridophytes includes two successive generations namely a ... . Fusion of male and female gametes results in zygote which develops into a sporophyte

How do pteridophytes reproduce sexually?

Description : How do pteridophytes reproduce sexually?

Last Answer : Prothallus an independent structure produces male and female gametes called antheridia and archegonia. The gametes fuse and forms zygote developing into a sporophyte.

How do pteridophytes reproduce asexually?

Description : How do pteridophytes reproduce asexually?

Last Answer : Pteridophytes reproduce asexually by producing haploid spores. The spores germinate into a haploid gametophyte.

What is sporophyte of pteridophytes?

Description : What is sporophyte of pteridophytes?

Last Answer : Sporophyte is the adult plant body in pteridophytes.

Mention the characteristics of pteridophytes.

Description : Mention the characteristics of pteridophytes.

Last Answer : a) Pteridophytes are vascular plants. b) They were the first terrestrial plants to develop vascular tissues. c) They grow in moist soil, on damp walls, cool & shady regions. The plant body ... is by fusion of male and female gametes. Ex: Nephrolepis, Selaginella, Adiantum, Lycopodium, Marsilea.

Give reason: Pteridophytes are included under tracheophytes.

Description : Give reason: Pteridophytes are included under tracheophytes.

Last Answer : As pteridophytes have vascular tissues, they are included under tracheophytes.

What are Pteridophytes?

Description : What are Pteridophytes?

Last Answer : Pteridophytes are vascular plants. They are the first terrestrial plants to develop vascular tissues.

Give the characteristics of Pteridophytes?

Description : Give the characteristics of Pteridophytes?  

Last Answer : i) The plant body of Pteridophytes has true roots, stem and leaves. ii) They have vascular tissues. iii) They do not bear flowers, fruits and seeds. iv) Both sporophyte and gametophyte generations are independent and free living. v) The gametophyte is much reduced and smaller in size. 

.A well developed archegonium with neck consisting of 4-6 rows and neck canal cells, characterises (a) gymnosperms and flowering plants (b) pteridophytes and gymnosperms (c) gymnosperms only (d) bryophytes and pteridophytes

Description : .A well developed archegonium with neck consisting of 4-6 rows and neck canal cells, characterises (a) gymnosperms and flowering plants (b) pteridophytes and gymnosperms (c) gymnosperms only (d) bryophytes and pteridophytes

Last Answer : d) bryophytes and pteridophytes.