. Write a short account of the structure and
reproduction in Rhynia.
Answers
Answer:
Animals which live in the forest help it grow and regenerate in following ways: By eating vegetation they clear land for fresh growth. Animals help flowering plants in pollination and seed dispersal. Dead remains of animals make humus afterThe process of photosynthesis differs in green plants and sulfur bacteria.
In plants, water is utilized along with carbon dioxide to release glucose and oxygen molecules.
In the case of sulfur bacteria, hydrogen sulfide is utilized along with carbon dioxide to release carbohydrates, sulfur, and water molecules.Raw materials used in nylon are petroleum,natural gas,lime stone, coal,water,acetylene etc. polyster is made using purified terephthalic acid and monoethelyne glycol etc
Answer:
The plants of Rhynia were herbaceous. R. major was 50 cm. in height and 1.5 to 6 mm in diameter whereas R. gwynne-vaughani was only about 20 cm. in height and 1 to 3 mm in diameter.
The plant body was differentiated into a subterranean rhizome with an abruptly turned upright photosynthetic aerial shoots. Roots were absent but at places rhizome was provided with tufts of unicellular rhizoids (Fig. 1 A, B). The aerial shoots were cylindrical and leafless with a tapering dichotomously branched system.
In R. major the aerial shoots were smooth (Fig 1 A) but in case of R. gwynne-vaughani many adventitious branches were present on the aerial shoots as well as rhizome (Fig. 1 B). These branches perhaps help in vegetative propagation.
The tip of the aerial branch usually bears a solitary terminal sporangium which was about 12 mm in length and about 4 mm in diameter.
