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Question
In which of the following groups would you place a plant which produces spores and embryos but lacks seeds and vascular tissues?
In which of the following groups would you place a plant which produces spores and embryos but lacks seeds and vascular tissues?
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Solution
The correct option is C Bryophytes
1. The Plant body is a gametophyte. They grow in areas which arc in between the aquatic and terrestrial habitats i.e. amphibious zone and hence known as amphibious plants.2. They have thalloid or leafy multi cellular green plant body.3. The smallest form is microscopic (e.g. Zoopsis). The largest genus recorded so far is an Australian Dawsonia which is about 70 cms in length.4. The dominant plant body is gametophyte (n) which is independent.5. The plant body lacks true roots, stem or leaves.6. Rhizoids - (root like structure) serve the function of roots.7. The plants are green and possess chloroplasts.8. They show autotrophic mode of nutrition.9. Vascular tissues are completely absent.10. Sexual reproduction is oogamous.11. Sex organs are multi cellular and jacketed.12. Male reproductive organ is known as antheridium. It is a club shaped structure being borne by a narrow stalk. It produces biflagellate and motile male gametes or antherozoids.14. The female sex organ is known as archegonium. It is a flask shaped structure having a swollen base and a narrow neck.15. Water is essential for fertilization.16. The diploid zygote undergoes repeated divisions to form a multi cellular sporophyte.17. Sporophyte is dependent on the gametophyte for nutrition.18. Sporophyte generally consists of foot, seta and capsule. It produces haploid spores (homospores).19. Spores on germination give rise to gametophyte plant.20. Gametophyte and sporophyte differ in form which alternate with each other, thus heterologous alternation of generation is seen in Bryophytes.
1. The Plant body is a gametophyte. They grow in areas which arc in between the aquatic and terrestrial habitats i.e. amphibious zone and hence known as amphibious plants.
2. They have thalloid or leafy multi cellular green plant body.
3. The smallest form is microscopic (e.g. Zoopsis). The largest genus recorded so far is an Australian Dawsonia which is about 70 cms in length.
4. The dominant plant body is gametophyte (n) which is independent.
5. The plant body lacks true roots, stem or leaves.
6. Rhizoids - (root like structure) serve the function of roots.
7. The plants are green and possess chloroplasts.
8. They show autotrophic mode of nutrition.
9. Vascular tissues are completely absent.
10. Sexual reproduction is oogamous.
11. Sex organs are multi cellular and jacketed.
12. Male reproductive organ is known as antheridium. It is a club shaped structure being borne by a narrow stalk. It produces biflagellate and motile male gametes or antherozoids.
14. The female sex organ is known as archegonium. It is a flask shaped structure having a swollen base and a narrow neck.
15. Water is essential for fertilization.
16. The diploid zygote undergoes repeated divisions to form a multi cellular sporophyte.
17. Sporophyte is dependent on the gametophyte for nutrition.
18. Sporophyte generally consists of foot, seta and capsule. It produces haploid spores (homospores).
19. Spores on germination give rise to gametophyte plant.
20. Gametophyte and sporophyte differ in form which alternate with each other, thus heterologous alternation of generation is seen in Bryophytes.
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