Tag: biology

Glycogenesis is the process of glycogen synthesis, in which glucose molecules are added to chains of glycogen for storage. This process is activated during rest periods following the Cori cycle, in the liver, and also activated by insulin in response to high glucose levels. Mostly glycogenesis occurs in the liver.

The yellow colour of the stools is due to the presence of bile pigments. Bile pigments are the excretory products. Bile is a bitter-tasting greenish-yellow alkaline fluid produced by the liver and stored in the gall bladder and secreted into the duodenum. It assists the digestion and absorption of fats by the action of bile salts, which chemically reduce fatty substances and decrease the surface tension of fat droplets so that they are broken down and emulsified. So, the correct answer is (a).

• A thallus is composed of filaments or plates of cells and ranges in size from a unicellular structure to a complex tree-like form.
  
• Thallophyta is a division of the plant kingdom including primitive forms of plant life showing a simple plant body i.e thallus like plant body. For example, unicellular to large algae, fungi, lichens.
• The Thallophyta have been divided into two subdivisions. They are  Myxothallophyta (myxomycetes) and Euthallophyta (bacteria, fungi, lichens, algae).
• Hence Plants having thallus bodies are known as 'Thallophyta'.

Most premitive vascular plants are pteridophytes.
Cycas belongs to gymnosperms. Gymnosperms have a well-differentiated plant body with vascular tissues. They produce naked seeds. Hence, option A is incorrect. 
Moss belongs to bryophytes. Bryophytes have a well-differentiated plant body with stem and leaf-like structures. But there is no specialized vascular or mechanical tissue. Therefore, option C is incorrect. 
Brown algae belong to thallophytes. Thallophytes do not have well-differentiated plant body and vascular tissues. Therefore, option D is incorrect. 
Ferns belong to pteridophytes. Pteridophytes have a well-differentiated plant body with vascular tissues. Therefore, option B is correct. 

Zygotes do not undergo reduction division immediately. They produce a multicellular body called a sporophyte. The sporophyte is not free-living but attached to the photosynthetic gametophyte and derives nourishment from it. Some cells of the sporophyte undergo reduction division (meiosis) to produce haploid spores. So, the correct option is "A" (Funaria).