Tag: structure and functions of living organisms -ii

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Questions Related to structure and functions of living organisms -ii

Multiple choice biology structure and functions of living organisms -ii dental care, eye care and hair care dental care and dental diseases salivary glands

Variation in length of the filament of stamen can be seen in.

  1. Salvia

  2. Mustard

  3. Chinarose
  4. Both $(1)$ and $(2)$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Salvia (sage) is well-known for its specialized pollination mechanism involving a lever system in the stamen, where the filaments vary in length to facilitate pollen transfer by insects.

Multiple choice biology structure and functions of living organisms -ii dental care, eye care and hair care dental care and dental diseases salivary glands

Which of the following statements is TRUE about glandular epithelium is salivary gland?

  1. It consists of isolated single cells

  2. It consists of multicellular cluster of cells

  3. Its secretions are endocrine

  4. It consists of squamous epithelial cells
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Glandular epithelium in salivary glands is organized into multicellular structures known as acini or secretory units. These clusters of cells are specialized for the production and secretion of saliva, rather than existing as isolated cells or simple squamous layers.

Multiple choice biology structure and functions of living organisms -ii dental care, eye care and hair care dental care and dental diseases salivary glands

Enzyme ptyalin or salivary amylase present in the saliva gets activated by 

  1. Mastication of food

  2. Hydrolysis of food by saliva

  3. Starch present in the food

  4. Chloride ions present in saliva
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Chewing or mastication is the process by which food is crushed and ground my teeth. It is the first step of digestion, and it increases the surface area of foods to allow a more efficient break down by enzymes. So the correct option is 'Mastication of food '.

Multiple choice biology the life cycle of animals how do animals reproduce? excretory, nervous and reproductive system structure and functions of living organisms -ii

A mixture containing DNA fragments a, b, c and d with molecular weights of a+b = c, a > b and d > c, was subjected to agarose gel electrophoresis. The movement of these fragments from cathode to anode sides of the gel would be

  1. Smaller molecules move faster

  2. Both smaller and larger will move at same pace

  3. Larger will move faster

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • In Agarose gel electrophoresis we separate macromolecules like DNA, RNA and protein on the basis of their molecular size and charge.
  • In this Shorter molecules move faster and migrate farther than longer ones because shorter molecules migrate more easily through the pores of the gel. 
  • DNA migrate towards anode.
Multiple choice biology the life cycle of animals how do animals reproduce? excretory, nervous and reproductive system structure and functions of living organisms -ii

Cowper's glands are found in-

  1. Male mammals.

  2. Female mammals.

  3. Male amphibians.

  4. Female amphibians.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Cowper's glands (also known as bulbourethral glands) are a pair of exocrine glands in the male reproductive system of many mammals, which secrete a fluid that neutralizes acidity in the urethra.

Multiple choice biology the life cycle of animals how do animals reproduce? excretory, nervous and reproductive system structure and functions of living organisms -ii

Parthenogenesis is the development of an organism directly from : 

  1. Female gametes

  2. Vegetative cells

  3. Fertilized ovum

  4. None of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Parthenogenesis is a form of asexual reproduction where an embryo develops from an unfertilized egg cell. Since none of the specific options (female gametes, vegetative cells, fertilized ovum) accurately describe the process of development from an unfertilized egg, 'None of these' is correct.