Tag: biology

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Questions Related to biology

Multiple choice biology digestion and absorption liver functions of the liver secretory organs

Cell organelle showing xenobiotics with the help of cytochrome $P450$ is also involved in

  1. Glycosylation process

  2. Glycolate oxidation or metabolism

  3. Glycogen metabolism

  4. Glyoxylate metabolism
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Cytochrome P450 is an enzyme found in cell organelles such as mitochondria and is involved in the metabolism of xenobiotics. Glyoxalate cycle involves the production of glucose from fatty acids and a part of the cycle also occurs in the mitochondria. Therefore, the cell organelle involved in xenobiotic metabolism with the help of cytochrome P450 is also involved in glyoxalate metabolism. 
So, the correct option is 'Glyoxalate metabolism'.
Multiple choice biology digestion and absorption liver functions of the liver secretory organs

Glycogenesis refers to

  1. Conversion of glycogen to glucose.

  2. Breakdown of glucose to form pyruvate.

  3. Breakdown of pyruvate to form glucose.

  4. Conversion of glucose to glycogen.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

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.

Multiple choice biology digestion and absorption liver functions of the liver secretory organs

A young infant may be feeding entirely on mother's milk which is white in colour but the stools which the infant passes out is quite yellowish. The yellow colour of stool is due to

  1. bile pigments passed through bile juice

  2. undigested milk protein casein

  3. pancreatic juice poured into duodenum

  4. intestinal juice.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

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).

Multiple choice biology kingdom plantae introduction to pteridophytes cryptogams pteridophyta

Plants having thallus body are known as

  1. Pteridophyta

  2. Bryophyta

  3. Thallophyta

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
  • 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'.
Multiple choice biology pictorial feature of plant kingdom pteridophytes introduction to pteridophytes cryptogams

Which of the following vascular plant is used in scouring and polishing of metals?

  1. Adiantum

  2. Selaginella

  3. Dryopteris

  4. Equisetum
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
A.Adiantum - it has medicinal value
B.Selaginella - It is used as ornamental plant
C.Dryopteris - It is also used as ornamental plant
D.Equisetum - It is used in scouring and polishing metals
So, the correct option is 'Equisetum'.
Multiple choice biology pictorial feature of plant kingdom pteridophytes introduction to pteridophytes cryptogams

The most primitive vascular plants are ___________.

  1. Cycas

  2. Ferns

  3. Moss

  4. Brown algae
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

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. 

Multiple choice examples of bryophytes plant kingdom biology

Zygote do not undergo reduction division immediately but produce multicellular sporophyte in

  1. Funaria

  2. Selaginella

  3. Cycas

  4. All of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

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).

Multiple choice examples of bryophytes plant kingdom biology

Main plant of Funaria belongs to phase

  1. Polypoid

  2. Diploid

  3. Triploid

  4. Haploid
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The main plant body of a bryophyte like Funaria is the gametophyte, which is haploid (n).