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Mixed Test (Biology)

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In which of the following crosses will the progenies obtained be fifty percent homozygous recessive and fifty percent heterozygous?

  1. TT x Tt

  2. Tt x Tt

  3. Tt x tt

  4. TT x tt


Correct Option: C
Explanation:

In this condition the progenies obtained will be fifty percent homozygous recessive and fifty percent heterozygous.

Loss of one chromosome from one set is called

  1. tetrasomy

  2. nullisomy

  3. monosomy

  4. trisomy


Correct Option: C
Explanation:

It is the loss of one chromosome from a set.

If the enzyme extract is subjected to magnetic field, it splits to two fractions each catalyzing the same reaction. These fractions are called

  1. isozymes

  2. allosteric enzymes

  3. multiple enzymes

  4. co-enzymes


Correct Option: A
Explanation:

These are the enzymes which can catalyse the same type of reaction.

Which of the following is an enzyme filled organelle?

  1. Lysosome

  2. Ribosomes

  3. Mesosomes

  4. Oxysomes


Correct Option: A
Explanation:

These are organelles which contain digestive hydrolytic enzymes.

Which of the following studies considers all the organisms of a particular species inhabiting in a particular geographical area at a certain time?

  1. Synecology

  2. Autecology

  3. Demecology

  4. Ethology


Correct Option: C
Explanation:

It is the study of the population of a species in an area.   

To which of the following categories of biomolecules do dextrin, cellulose and pectin belong?

  1. Disaccharides

  2. Monosaccharides

  3. Polysaccharides

  4. Glycoprotein


Correct Option: C
Explanation:

Dextrin, pectin and cellulose are formed by joining of many molecules of sugar and are thus polysaccharides.

Which of the following is a single membrane organelle?

  1. Mitochondria

  2. Chloroplast

  3. Ribosomes

  4. Spherosomes


Correct Option: D
Explanation:

These are the organelles with a single membrane around them.

Which of the following organisms lacks membrane bound organelles?

  1. Lactobacillus

  2. Actinomycetes

  3. Sponges

  4. Plasmodium


Correct Option: A
Explanation:

It is a bacteria; the bacteria are prokaryotes and thus, lack membrane bound organelles.

Which type of aerial stem is present in eucalyptus?

  1. Excurrent

  2. Decurrent

  3. Culm

  4. Caudex


Correct Option: A
Explanation:

In this type, the single stem tapers towards apex.

Which of the following veins carries oxygenated blood in the human body?

  1. Superior vena cava

  2. Inferior vena cava

  3. Pulmonary vein

  4. Renal vein


Correct Option: C
Explanation:

It brings the oxygenated blood from the lungs back to the left auricle of heart.

Which type of bacteria will be used for a successful conjugation?

  1. F+ and F-

  2. Hfr and Hfr

  3. F+ and F+

  4. Hfr and F+


Correct Option: A
Explanation:

In this pair, one bacteria can act as donor and other act as recepient which results in a successful conjugation.

When do two chromatids of a chromosome separate from each other?

  1. During anaphase

  2. During telophase

  3. During metaphase

  4. During prophase


Correct Option: A
Explanation:

The poleward movement of chromatids of the chromosomes takes place during this phase.

Which of the following organisms are studied under malacology?

  1. Molluscs

  2. Fungi

  3. Monerans

  4. Ants


Correct Option: A
Explanation:

The study of molluscs is called malcology.

Which of the following genus of fungi forms the black moulds on the surface of bread?

  1. Agaricus

  2. Pencillium

  3. Saccharomyces

  4. Rhizopus


Correct Option: D
Explanation:

These fungi form the black moulds on the surface of bread.

Which of the following organelles contains the necessary enzyme for the metabolism of fatty acids?

  1. Mitochondria

  2. Chloroplast

  3. Glyoxysomes

  4. Endoplasmic reticulum


Correct Option: C
Explanation:

This organelle is concerned with the beta oxidation of fatty acids.

Match the following:

List A
List B
a. Mycology p. Birds
b. Ornithology q. Worms
c. Herpetology r. Fishes
d. Ichthyology s. Fungi
t. Snakes
  1. a - q, b - s, c - r, d - t

  2. a - p, b - s, c - r, d - t

  3. a - s, b - p, c - t, d - r

  4. a - s, b - t, c - p, d - r


Correct Option: C
Explanation:

Herpetology is the study of snakes.

In which of the following types of chromosomes is the length of both the arms equal?

  1. Arocentric

  2. Sub-metacentric

  3. Metacentric

  4. Telocentric


Correct Option: C
Explanation:

Centromere is in the centre so the arms are equal in length. 

Which of the following are an exception to cell theory?

  1. Fungi

  2. Bacteria

  3. Viruses

  4. Lichens


Correct Option: C
Explanation:

These are acellular structures.

Which type of phyllotaxy is found in calotropis?

  1. Opposite

  2. Alternate

  3. Spiral

  4. Whorl


Correct Option: A
Explanation:

In this type, two leaves borne on the same node appear to be opposite to each other.

Which of the following is the main factor of difference between photosynthetic and chemosynthetic bacteria?

  1. Energy source of food synthesis

  2. Distribution in the biosphere

  3. Mode of nutrition

  4. Intake of liquid food


Correct Option: A
Explanation:

Photosynthetic bacteria uses sunlight and chemosynthetic organisms use the chemical energy.

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