List of top Biology Questions

Adult human RBCs are enucleate. Which of the following statement(s) is/are most appropriate explanation for this feature?
(a) They do not need to reproduce
(b) They are somatic cells
(c) They do not metabolize
(d) All their internal space is available for oxygen transport
Which one of the following statements is not valid for aerosols?
Which cells of 'Crypts of Lieberkuhn' secrete antibacterial lysozyme?
The process of separation and purification of expressed protein before marketing is called
Alexander Von Humbolt described for the first time
The water potential of pure water is
Which among these is the correct combination of aquatic mammals?
Which of the following in sewage treatment removes suspended solids?
GnRH, a hypothalamic hormone, needed in reproduction, acts on
A baby boy aged two years is admitted to play school and passes through a dental check-up. The dentist observed that the boy had twenty teeth. Which teeth were absent?
Root hairs develop from the region of
Which ecosystem has the maximum biomass?
Which of the following options best represents the enzyme composition of pancreatic juice?
Good vision depends on adequate intake of carotene rich food.
Select the best option from the following statements:
  1. Vitamin A derivatives are formed from carotene .
  2. The photopigments are embedded in the membrane discs of the inner segment.
  3. Retinal is a derivative of vitamin A.
  4. Retinal is a light absorbing part of all the visual photopigments.
Which of the following facilitates opening of stomatal aperture?
The DNA fragments separated on an agarose gel can be visualised after staining with
Frog's heart when taken out of the body continues to beat for some time.
Select the best option from the following statements:
  1. Frog is a poikilotherm
  2. Frog does not have any coronary circulation
  3. Heart is "myogenic" in nature 
  4. Heart is autoexcitable
Which statement is wrong for Krebs' cycle?
Presence of plants arranged into well defined vertical layers depending on their height can be seen best in :
Identify the wrong statement in context of heartwood.
Mycorrhizae are the example of
Lungs are made up of air-filled sacs the alveoli. They do not collapse even after forceful expiration, because of:
Which one of the following statements is correct, with reference to enzymes?
In Bougainvillea thorns are the modifications of
The DNA double helix is exposed