Mosses have great ecological importance substantiate the statement with two reasons

Mosses along with lichens are the first organisms to colonise rocks and hence, are of great ecological importance. They decompose rocks making the substrate suitable for the growth of higher plants. Since mosses form dense mats on the soil, they reduce the impact of falling rain and prevent soil - erosion. Views: 5,963 (A) In liverworts, mosses and ferns gametophytes are free-living. (B) Gymnosperms and some ferns are heterosporous. (C) Sexual reproduction in F u c u s, V o l v o x and A l b ug o is oogamous. (D) The sporophyte in liverworts is more elaborate than that in mosses. (E) Both, P in u s and M a rc han t ia are dioecious. How many of the above statements are correct? • The predominant stage of its life cycle is the gametophyte which consists of two stages – protonema and leafy stages. • Leafy stage are attached to the soil through multi-cellular and branched rhizoids. • Sex organs-antheridia and archegonia are produced at the apex of the leafy shoots. • All of the above

Abstract Mosses are non-vascular plants usually found in moist and shaded areas, with great ecological importance in several ecosystems. This is especially true in northern latitudes, where mosses are responsible for up to 100% of primary production in some ecosystems. Mosses establish symbiotic associations with unique bacteria that play key roles in the carbon and nitrogen cycles. For instance, in boreal environments, more than 35% of the nitrogen fixed by diazotrophic symbionts in peatlands is transferred to mosses, directly affecting carbon fixation by the hosts, while moss-associated methanotrophic bacteria contribute 10–30% of moss carbon. Further, half of ecosystem N input may derive from moss–cyanobacteria associations in pristine ecosystems. Moss–bacteria interactions have consequences on a global scale since northern environments sequester 20% of all the carbon generated by forests in the world and stock at least 32% of global terrestrial carbon. Different moss hosts influence bacteria in distinct ways, which suggests that threats to mosses also threaten unique microbial communities with important ecological and biogeochemical consequences. Since their origin ~500 Ma, mosses have interacted with bacteria, making these associations ideal models for understanding the evolution of plant–microbe associations and their contribution to biogeochemical cycles. Get help with access Institutional access Access to content on Oxford Academic is often provided through institu...

Bryophytes, Ferns and Fern allies Lab 8 - Primitive Plants - Bryophytes, Ferns and Fern Allies Introduction to Bryophytes - Mosses, Liverworts, and Hornworts As we pass from mosses to ferns, we see a gradual transition from primitive to modern traits. There are two major trends you should focus on in today's lab. The first is a transition in life cycles, the second is a change in basic internal structure. First, all plants undergo an alternation of generations, between a haploid gametophyte stage and a diploid sporophyte stage. In the most primitive plants, like mosses, the gametophyte is dominant (i.e. it's big and green). In higher plants like ferns and fern allies, the sporophyte stage is dominant. Gametophytes produce gametes (sperm and eggs) in a special structure called a gametangium (-ia), while sporophytes produce spores in a special structure called a sporangium (-ia). Second, all plants need to get water to their cells. Primitive bryophytes like mosses and liverworts are so small that they can rely on diffusion to move water in and out of the plant. Mosses have a few strands of water conducting tissue in their central stem, but nothing like the large and well organized network of tubes in tracheophytes, or "tube plants". The vascular tissues in the more advanced ferns and "fern allies" are made up of xylem and phloem, which conduct water, nutrients, and food throughout the plant body. We'll look at these tissues in a later lab. Bryophytes also need a moist enviro...

Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as: (a) If both Assertion and Reason are true and Reason is the correct explanation of Assertion. (b) If both Assertion and Reason are true but Reason is not the correct explanation of Assertion. (c) If Assertion is true but Reason is false. (d) If both Assertion and Reason are false. Q.1. Assertion : Algae and fungi are grouped in thallophyta. Reason : Algae and fungi show no differentiation in thallus. Answer Answer: (a) On the basis of (i) Thallus like non-vascular plant body. (ii) Simple, unicellular non-jacketed sex organs and (iii) No embryo development after gametic union, the algae and fungi have long been grouped together in thallophyta. The algae and fungi are the result of parallel development and do not indicate any phylogenetic relationship. Q.2. Assertion : Chlorella could be utilised to keep the air pure in space vehicles. Reason : The space travelers feed on Chlorella soup. Answer Answer: (b) Chlorella could be utilised to keep the air in space vehicles pure and supply food in space stations and prolonged space flight trips. The space travellers could feed on Chlorella soup. It is nourishing but not appetizing food. Q.3. Assertion : Members of phaeophyceae vary in colour from olive green to various shades of brown Reason : Phaeophyceae possess chlorophyll a, c, carotenoids and xanthophylls. [AIIMS 2006] Answer Answer: (a) Phaeophyce...

Assertion(A): Mosses are of great ecological importance. Reason(R): Mosses are among the first organisms to colonize the rocks. Choices for Assertions and reasons: 1. Both (A) and (R) are true and (R) is the correct explanation of (A). 2. Both (A) and (R) are true, but (R) is not the correct explanation of (A). 3. (A) is true, but (R) is false. 4. (A) is false, but (R) is true. Plant Kingdom Botany NEET Practice Questions, MCQs, Past Year Questions (PYQs), NCERT Questions, Question Bank, Class 11 and Class 12 Questions, and PDF solved with answers

Benefits of Moss Moss is a very small, hardy, and green ancient plant. Just like all other plants, it takes nutrients from water and light but grows very slowly than others. Experts say that this How to Grow the Moss? If you are planning to use Moss in your garden or other area but now sure how to do this, here we are to help you. Mosses grown is lawns look very attractive and enticing. You can ask a gardener to do this job for you. There are hundreds of people offering their services with dozens of varieties. Growing this plant will not cost you much, and also, it needs less maintenance. It absorbs a lot of harmful toxins from wet areas, making them clean and also keeping the soil erosion free due to its water-absorbing properties. There are so many benefits of growing Moss instead of other plants and grass in your lawn. Aids the Environment There are so many things that are polluting our environment. Even the usage of various chemicals and fertilizers in gardening also making our natural water source unsafe. Unlike other plants, Moss needs less or even no chemicals to grow up. It can grow in almost every condition and environment. If you don’t water it for weeks, it can still survive. For some reason, if your plant has gone dead, it will grow again on its own. It means you need to buy Moss only once in many years. Making Environment Clean and Preventing Soil Erosion There are so many sites with mineral toxins where our regular plants can,t grow properly, even if we use h...

Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as: (a) If both Assertion and Reason are true and Reason is the correct explanation of Assertion. (b) If both Assertion and Reason are true but Reason is not the correct explanation of Assertion. (c) If Assertion is true but Reason is false. (d) If both Assertion and Reason are false. Q.1. Assertion : Algae and fungi are grouped in thallophyta. Reason : Algae and fungi show no differentiation in thallus. Answer Answer: (a) On the basis of (i) Thallus like non-vascular plant body. (ii) Simple, unicellular non-jacketed sex organs and (iii) No embryo development after gametic union, the algae and fungi have long been grouped together in thallophyta. The algae and fungi are the result of parallel development and do not indicate any phylogenetic relationship. Q.2. Assertion : Chlorella could be utilised to keep the air pure in space vehicles. Reason : The space travelers feed on Chlorella soup. Answer Answer: (b) Chlorella could be utilised to keep the air in space vehicles pure and supply food in space stations and prolonged space flight trips. The space travellers could feed on Chlorella soup. It is nourishing but not appetizing food. Q.3. Assertion : Members of phaeophyceae vary in colour from olive green to various shades of brown Reason : Phaeophyceae possess chlorophyll a, c, carotenoids and xanthophylls. [AIIMS 2006] Answer Answer: (a) Phaeophyce...

Bryophytes, Ferns and Fern allies Lab 8 - Primitive Plants - Bryophytes, Ferns and Fern Allies Introduction to Bryophytes - Mosses, Liverworts, and Hornworts As we pass from mosses to ferns, we see a gradual transition from primitive to modern traits. There are two major trends you should focus on in today's lab. The first is a transition in life cycles, the second is a change in basic internal structure. First, all plants undergo an alternation of generations, between a haploid gametophyte stage and a diploid sporophyte stage. In the most primitive plants, like mosses, the gametophyte is dominant (i.e. it's big and green). In higher plants like ferns and fern allies, the sporophyte stage is dominant. Gametophytes produce gametes (sperm and eggs) in a special structure called a gametangium (-ia), while sporophytes produce spores in a special structure called a sporangium (-ia). Second, all plants need to get water to their cells. Primitive bryophytes like mosses and liverworts are so small that they can rely on diffusion to move water in and out of the plant. Mosses have a few strands of water conducting tissue in their central stem, but nothing like the large and well organized network of tubes in tracheophytes, or "tube plants". The vascular tissues in the more advanced ferns and "fern allies" are made up of xylem and phloem, which conduct water, nutrients, and food throughout the plant body. We'll look at these tissues in a later lab. Bryophytes also need a moist enviro...

Mosses along with lichens are the first organisms to colonise rocks and hence, are of great ecological importance. They decompose rocks making the substrate suitable for the growth of higher plants. Since mosses form dense mats on the soil, they reduce the impact of falling rain and prevent soil - erosion. Views: 5,660 (i) They are plants in which the ovules are not enclosed by any ovary wall and remain exposed before and after fertilization. (ii) The giant red wood tree Sequoia is one of the tallest tree species of the group. (iii) The roots are generally tap roots. (iv) They are heterosporous and they produce haploid microspores and megaspores.

Benefits of Moss Moss is a very small, hardy, and green ancient plant. Just like all other plants, it takes nutrients from water and light but grows very slowly than others. Experts say that this How to Grow the Moss? If you are planning to use Moss in your garden or other area but now sure how to do this, here we are to help you. Mosses grown is lawns look very attractive and enticing. You can ask a gardener to do this job for you. There are hundreds of people offering their services with dozens of varieties. Growing this plant will not cost you much, and also, it needs less maintenance. It absorbs a lot of harmful toxins from wet areas, making them clean and also keeping the soil erosion free due to its water-absorbing properties. There are so many benefits of growing Moss instead of other plants and grass in your lawn. Aids the Environment There are so many things that are polluting our environment. Even the usage of various chemicals and fertilizers in gardening also making our natural water source unsafe. Unlike other plants, Moss needs less or even no chemicals to grow up. It can grow in almost every condition and environment. If you don’t water it for weeks, it can still survive. For some reason, if your plant has gone dead, it will grow again on its own. It means you need to buy Moss only once in many years. Making Environment Clean and Preventing Soil Erosion There are so many sites with mineral toxins where our regular plants can,t grow properly, even if we use h...