Biology - Online Test
Q1. Influx and efflux of H+ ions inside the cell change the
Answer : Option D
Explaination / Solution:
pH of a solution is depends upon hydrogen ions concentration. Influx and efflux of H+ ions inside the cell change the pH of solution present in soil.
Q2.
In elephant and walrus, projecting tusks are :
Answer : Option B
Explaination / Solution:
The projecting tusk of elephant and walrus are incisors and canines respectively. These teeth are not used for chewing food.
Q3. The drug which binds to specific opioid receptors present in our central nervous system and gastrointestinal tract is
Answer : Option D
Explaination / Solution:
Opioids are substances that act on opioid receptors to produce morphine-like effects.
The endogenous opioids are dynorphins, enkephalins, endorphins, endomorphins and nociceptin. The opioid receptors are ~40% identical to somatostatin receptors (SSTRs). Opioid receptors are distributed widely in the brain, and are also found in the spinal cord and digestive tract.
Opioids are most often used medically to relieve pain, and by people addicted to opioids.
Q4. Part of brain that acts as relay centre to receive and transmit general sensations except smell :
Answer : Option C
Explaination / Solution:
Thalamus is the part of brain that acts as relay centre to receiveand transmit general sensations except smell. Thalamus is located in the forebrain superior to the midbrain.
Q5. Cycas is a gymnosperm as it has
Answer : Option C
Explaination / Solution:
The gymnosperms (gymnos : naked, sperma : seeds) are plants in which the ovules are not enclosed by any ovary wall and remain exposed, both before and after fertilisation. The seeds that develop post-fertilisation, are not covered, i.e., are naked. Since, Cycas has naked seeds, it belongs to gymnosperms.
Q6. The staining procedure is developed by
Answer : Option C
Explaination / Solution:
The staining procedure developed by Gram viz., those that take up the gram stain are gram positiveand the others that do not are called gram negative bacteria.
Q7. In the synthesis of which of the following, the DNA molecule is not directly involved?
Answer : Option A
Explaination / Solution:
DNA molecules are not directly involved in synthesis of protein. In protein synthesis, DNA, first undergoes transcription process and produce m-RNA. Translation process takes place and produce protein.
Q8. Each photosystem has all the pigments forming light harvesting system also called as
Answer : Option D
Explaination / Solution:
Each photosystem has all the pigments (except one molecule of chlorophyll a) forming a light harvesting system also called antennae. These pigments help to make photosynthesis more efficient by absorbing different wavelengths of light.
Q9. Which of the following is not correctly matched :
Answer : Option C
Explaination / Solution:
Respiration is a physiological process. Total lung capacity (TLC) includes vital capacity (VC) and residual volume. Cutaneous respiration is the breathing via skin.
Q10. The class of domesticated fowl or bird used for food or their egg is called
Answer : Option C
Explaination / Solution:
Poultry is the class of domesticated fowl or bird used for their meat or their egg. They include chicken, duck and sometimes turkey and geese.
