Which of the following are not membrane bound?
Vacuoles
Ribosomes
Lysosomes
Lysosomes
The body cells in cockroach discharge their nitrogenous waste in the haemolymph mainly in the form of
ammonia
potassium urate
urea
urea
Which of the following biomolecules does have a phosphodiester bond?
Fatty acids in a diglyceride
Monosaccharides in a polysaccharide
Amino acids in a polypeptide
Amino acids in a polypeptide
Arrange the following events of meiosis in correct sequence:
(a) Crossing over
(b) Synapsis
(c) Terminalisation of chiasmata
(d) Disappearance of nucleolus
(b), (a,) (d), (c)
(b), (a) (c), (d)
(a), (b) (c), (d)
(a), (b) (c), (d)
Root pressure develops due to
active absorption
low osmotic potential in soil
passive absorption
passive absorption
A.
active absorption
Root pressure is the positive pressure that develops in the roots of plants by the active absorption of nutrients from the soil. When the nutrients are actively absorbed by root hairs, water (along with minerals) increase the pressure in the xylem. This pressure pushes water up to smell heights.
Which one of the following animals has two separate circulatory pathways?
Frog
Lizard
Whale
Whale
The structures that help some bacteria to attach to rocks and/or host tissues are
Rhizoids
Fimbriae
mesosomes
mesosomes
Body having meshwork of cells, internal cavities lined with food filtering flagellated cells and indirect development are the characteristic of phylum
Coelenterate
Porifera
Mollusca
Mollusca
The oxygen evolved during photosynthesis comes from water molecules. Which one of the following pairs of elements is involved in this reaction?
Manganese and Chlorine
Manganese and Potassium
Magnesium and Molybdenum
Magnesium and Molybdenum