Short Answer Type Questions:
a. What are the two divisions of plants on the basis of flowers?
b. Can yeast reproduce sexually? Why?
c. Name the major divisions of Cryptogam and Phanerogam.
d. What is an inflorescence?
e. Name the major floral whorls.
2. Long Answer Type Questions:
a. How are cryptogams different from phanerogams? Explain with at lea
b. Why is a spirogyra called a thallus? Which type of nutrition does it sh
called conifer? Give its 3 major characteristic features
tell me ans
Answers
Answer:
Hello....
Explanation:
Angiosperms. 1)a)Angiosperms are the flowering plants. Approximately 80 percent of the known green plants are covered by the angiosperms. Monocotyledonous and dicotyledonous plants are the two divisions of angiosperms.
b)Yeasts can also reproduce sexually by means of sexual spores called ascospores which result from the fusion of the nuclei from two cells followed by meiosis. Sexual reproduction is much less common than asexual reproduction but does allow for genetic recombination.
c)Most Cryptogams do not have a vascular system. Cryptogams can be divided into Thallophyta, Bryophyta, and Pteridophyta. In contrast to Cryptogams, phanerogams are highly developed plants with a vascular system and plant body differentiation. The two classes of phanerogams are gymnosperms and angiosperms.
d)Inflorescence, in a flowering plant, a cluster of flowers on a branch or a system of branches. An inflorescence is categorized on the basis of the arrangement of flowers on a main axis (peduncle) and by the timing of its flowering (determinate and indeterminate). Inflorescence. Flower. Titan arum.
e)A typical flower has four main parts—or whorls—known as the calyx, corolla, androecium, and gynoecium.
2)a)Cryptogams and phanerogams are two sub-kingdoms of the kingdom Plantae.
Cryptogams consist of seedless plants and plant-like organisms whereas phanerogams consist of seed-bearing plants.
In contrast to Cryptogams, phanerogams are highly developed plants with a vascular system and plant body differentiation.
b)Thallus is the undifferentiated 'vegetative tissue' of some organisms belonging to the group of algae, fungi, lichens, liverworts, etc. Spirogyra is a free-floating 'green algae' with a long filamentous body structure. ... It is because of this structure that Spirogyra plant body is a thalloid.
Spirogyra Longata performs photosynthesis to receive its nutrients. This alga contains special cells called stomata that open and close so the organism can take in carbon dioxide and release oxygen during the chemical reaction in photosynthesis.
Identifying Characteristics of Spirogyra:
They have a multi-cellular filamentous body with a mucilaginous sheath. They bear 2-10 spiral and ribbon-shaped chloroplasts with many pyrenoids. The cell wall is composed of pectin and cellulose. It reproduces vegetatively and sexually.
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Answer:
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