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Which of the following are found in extreme saline
conditions?
Archaebacteria
Eubacteria
Cyanobacteria
Mycobacteria
A.
Archaebacteria
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Select the mismatch :
Frankia – Alnus
Rhodospirillum – Mycorrhiza
Anabaena – Nitrogen fixer
Rhizobium – Alfalfa
B.
Rhodospirillum – Mycorrhiza
Which of the following is made up of dead cells?
Xylem parenchyma
Collenchyma
Phellem
Phloem
C.
Phellem
Cork cambium undergoes periclinal division and cuts off thick walled suberised dead cork cells towards outside and it cuts off thin walled living cells i.e., phelloderm on inner side.
Which cells of 'Crypts of Lieberkuhn' secrete antibacterial lysozyme?
Argentaffin cells
Paneth cells
Zymogen cells
Kupffer cells
B.
Paneth cells
– Kupffer-cells are phagocytic cells of liver.
– Zymogen cells are enzyme producing cells.
– Paneth cell secretes lysozyme which acts as anti-bacterial agent.
– Argentaffin cells are hormone producing cells.
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
Only (d)
Only (a)
(a), (c) and (d)
(b) and (c)
A.
Only (d)
In Human RBCs, nucleus degenerates during maturation which provide more space for oxygen carrying pigment (Haemoglobin). It lacks most of the cell organelles including mitochondria so respires anaerobically
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