Zoology - Online Test
Q1. Which one is not a member of kingdom Protista?
Answer : Option C
Explaination / Solution:
Kingdom Protista includes unicellular, eukaryotic organisms only. Phycomycetes is a subdivision of fungus which are multicellular. Protozoa, slime molds and euglenoids are part of kingdom Protista.
Q2. Mediterranean orchid Ophrysensures pollination by
Answer : Option C
Explaination / Solution:
Mediterranean orchid Ophrys ensures pollination by co-evolution, sexual deceit and pseudo-copulation. One petal of flower bears an uncanny resemblance to female of bee in size, colour and markings.
Q3. One of the gut hormones which is often referred to as the "hunger hormone" since it works as a strong stimulant for appetite and feeding is :
Answer : Option C
Explaination / Solution:
Ghrelin the hunger hormone is a peptide hormone produced by ghrelinergic cells in the gastrointestinal tract which function as neurpeptide in the central nervous system. It stimulates appetite and feeding.
Q4. Carcinoma refers to
Answer : Option A
Explaination / Solution:
Carcinoma is a type of cancer or Malignant tumors of the skin or mucous membrane that starts in cells that make up the skin or the tissue lining organs, such as the liver or kidneys.
The physical, chemical or biological agents that convert normal cell into cancerous cell are called carcinogens.
Q5. Select the correct terms for labels
Answer : Option A
Explaination / Solution:
The external layer is composed of a dense connective tissue and is called the sclera. The ciliary body itself continues forward to form a pigmented and opaque structure called the iris which is the visible coloured portion of the eye. In front of the lens, the aperture surrounded by the iris is called the pupil.
Q6. The chromosome having centromeres at one terminal end is called
Answer : Option A
Explaination / Solution:
A telocentric chromosome's centromere is located at the terminal end of the chromosome. Telomeres may extend from both ends of the chromosome.their shape is like i during anaphase. For example, the standard house mouse karyotype has only telocentric chromosomes.
Humans do not possess telocentric chromosomes
Q7. Number of nitrogenous bases in a Codon is
Answer : Option B
Explaination / Solution:
A codon is a sequence of 3 nitrogenous bases located on mRNA that will pair up with the anticodon of tRNA to make the polypeptide (protein) I. 64 codons can be obtained from four nitrogenous bases if arranged in group of 3.
Q8.
RBCs and muscle cells carry out anaerobic respiration, but :
i. RBCs are permanently anaerobic and muscle cells are temporarily anaerobic
ii. RBCs are temporarily anaerobic and muscle cells are permanently anaerobic
iii. Muscle cells lack mitochondria.
Answer : Option D
Explaination / Solution:
Red blood cells and muscle cells carry out anaerobic respiration but RBC’s are permanently anaerobic and muscle cells are temporarily anaerobic in nature.
Q9. The capacity to generate a whole plant from any cell/ explant is called
Answer : Option B
Explaination / Solution:
The ability to generate a whole plant from any cell/explant is called totipotency. Tissue culture method is used to generate whole plant from plant parts.
Q10. If a species experiences a 90 percent decline over 10 years (or three generations), would be classified as :
Answer : Option B
Explaination / Solution:
A critically endangered (CR) species is one which has been categorized by the International Union for Conservation of Nature (IUCN) as facing a very high risk of extinction in the wild.
Criteria for critically endangered is an observed, estimated, inferred or suspected population size reduction of ≥ 90% over the last 10 years or three generations, whichever is the longer, where the causes of the reduction are clearly reversible AND understood AND ceased.
Critically endangered species should be protected to avoid extinction.
