CBSE Questions for Class 11 Medical Biology Plant Kingdom Quiz 7 - MCQExams.com

• Angiosperms are flowering plants whose seeds are covered by or enclosed in fruits that develop from the ovary.
• Gymnosperms are naked seeded plants.
• Cryptogams are non flowering plants. E.g-  Algae, Bryophyte, Pteridophyte

• Pinus, Cedar, and fir are examples of gymnosperms which are usually big trees. 
• These do not bear true flowers but bear naked seeds inside cones.
• Mango, peas, and cashew are examples of angiosperms that bear flowers, fruit, and seeds. 
• Their seeds are enclosed in a fruit. 

• Bryophytes are called the amphibians of the plant kingdom. 
• The plant body is commonly differentiated to form stem and leaf-like structures. 
• However, there is no specialized tissue for the conduction of water and other substances from one part of the plant body to another. 
• Examples are moss (Funaria) and Marchantia.

• Bryophytes are small, non-vascular plants lacking true roots, stems, and leaves. The plant body may be thalloid or erect. Mosses, liverworts, and hornworts are bryophytes.
• Marchantia is a bryophyte. It is a type of liverwort. The plant body is thalloid, with root-like structures called rhizoids on the undersurface.
  
• Funaria is a genus of moss. It has no vascular system. Spirally arranged leaf-like structures are found. Root-like structures called rhizoids are present.
• Thallophyta includes simple plants without roots, stems, and leaves. 
• Pteridophytes are vascular plants with true roots, stems, and leaves. 
• Phanerogams are plants with distinct reproductive organs. These include seed-bearing plants (gymnosperms and angiosperms). 
• Hence, the correct answer is option B. 

Some nutrition practitioners say that blue green algae helps satisfy appetite and supplies good nutrition while dieting. Blue-green algae Spirulina, a well-known example, is a group of 1,500 species of cyanobacteria. The two most common species used for human consumption are Spirulina maxima and Spirulina platensis. Spirulina is particularly rich in protein and also contains carotenoids, vitamins, minerals, and essential fatty acids. Blue-green algae (Spirulina) is a concentrated source of nutrients compared to most foods and hence is often advised for people recovering from prolonged illness.

So, the correct answer is 'Is rich in proteins'

• Pteridophytes are also called first vascular cryptogams or spore-bearing vascular plants. 
• Vascular plants contain conducting system for the transport of water, minerals, and food materials like xylem and phloem tissues in plants. 
• They include angiosperms and gymnosperms and plants that reproduce by spores—the ferns and other so-called lower vascular plants. The pteridophytes represent the oldest vascular plants. 
• Thus, the correct answer is ‘Pteridophyta.’

• Both Gymnosperms and Angiosperms have well-differentiated roots, stems, and leaves. 
• They are Phanerogams that are characterized by the presence of seeds, unlike Cryptogams that do not form seeds.

• Pteridophytes and spermatophytes (gymnosperms and angiosperms) are vascular plants as these plants are found in terrestrial habitats. 
• Mosses, algae and fungi are nonvascular ones. 

• The cryptogams are a group of plants that do not produce seeds. This group contains algae, bryophytes, and pteridophytes. These are spore-producing plants. 
• Pteridophytes are vascular plants which means that these plants have xylem and phloem. These tissues are together known as vascular bundles. 

• Gymnosperms are the naked seed-bearing plants. A naked seed means that the ovules are not completely enclosed by sporophytic tissue at the time of fertilization. 
• Most of the seed plants have pollen, which contains and transports the sperm to fertilize the egg. 
• As pollen is resistant to desiccation, the sperm can be transported between plants across large distances without drying up. 
• The gymnosperms (naked seed plants) consists of four phyla. These are conifers, cycads, gingkoes, and gnetophytes. Cycads produce pollen, but the sperm still swims down the pollen tube using flagella. 
• As it also has a naked seed, it is classified as a gymnosperm.
  Hence, option C is correct. 

• All of the above organisms are the genus of cyanobacteria which are used for fixing nitrogen in the nitrogen cycle.
• So the correct answer is 'All of the above'.

• Gymnodinium breve (later named as Karenia brevis) is a unicellular photosynthetic dinoflagellate mostly found in marine waters. 
• It is responsible for causing red tides when they are multiplied to higher than normal concentration. 
• Noctiluca results in green tides. Symbiodinium is related to coral reefs. Nematodinium is light sensitive.
• The correct answer is B.