Sieve tubes and companion cells can be seen in
A) Cambium
B) Cork
C) Phloem
D) Xylem
1 Answers
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Single maize root apical meristem can give rise to more than (A)___ new cells per hour whereas cells in a watermelon may increase in size o by upto (B
Correct Answer - A-17,500 B-3,50,000
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2 ml of ethanoic acid was taken in three test tubes A, B and C and 2 ml, 4 ml and 8 ml water was added to them respectively.
D) All the test tubes
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i) All living organisms are composed of cells and products of cells, ii) All cells arise from preexisting cells.
C) Cell theory
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Identify the xylem element. A) Trachieds B) Sieve cells C) Sieve tubes D) Companion cells
(A)Trachieds Xylem elements are - Trachieds, vessels, xylem fibre and xylem parenchyma
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Identify the xylem element. A) Trachieds B) Sieve cells C) Sieve tubes D) Companion cells
2 Answers
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a. How are the hybridoma cells selected from the culture of B-cells and Myeloma cells while fusing them in hybridoma technology?
a. Using HAT medium b. Monoclonal antibody which is used to treat early stages of breast cancer is Herceptin (trastuzumab). It works by attaching itself to HER2 receptors by blocking them from...
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Death of companion cell causes death of sieve tube cells and vice versa. Justify.
Companion cells: a. These are narrow elongated and living. b. Companion cells are laterally associated with sieve tube elements. c. Companion cells have dense cytoplasm and prominent nucleus. d. Nucleus of companion cell regulates...
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The sieve tube cell is connected to companion cell through phloem parenchyma by
(A) Plasmodesmata
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Take two test tubes with some water. Add salt powder to one test tube and add crystals of salt to the second one. Observe.
B) size of the solute
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Take two test tubes, one filled with water and one with kerosene. Now add a spoon of salt in both and stir.
B) To identify which mixture is homogeneous and which is heterogeneous.
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