In land plants, the guard cells differ from other epidermal cells in having

A. cytoskeleton.

B. mitochondria.

C. endoplasmic reticulum.

D. chloroplasts.

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  1. Match column-I with column-II and choose the correct option.A. Spring wood orI. Lighter in colour early…
  2. T.S. of dicot stem is given below, certain parts have been marked by alphabets (A I). Choose the option…
  3. Bast fibres are made up of _____________cells.
  4. As secondary growth proceeds, in a dicot stem, the thickness of
  5. Identify types of vascular bundles in given figures A, B and C.
  6. The given diagrams show stomatal apparatus in dicots and monocots. Which one is correct option for A,…
  7. Choose the correct labelling of (A J) in the given figure of T.S. of monocot root.
  8. Cork cambium and vascular cambium are
  9. Various functions like photosynthesis, storage, excretion performed by _____________.
  10. The given figure shows apical meristem of root apex with few part marked as A, B and C. Identify the…
  11. Cells of permanent tissues are specialized
  12. Cork is formed from
  13. Which of the following are present in monocot root ?
  14. Cambium is considered as a lateral meristem because
  15. Which of following helps bamboo and grasses to elongate ?
  16. A vascular bundle in which the protoxylem is pointing to the periphery is called __________.
  17. Which of the following pair of match is not correct?
  18. A piece of wood having no vessels (trachea) must be belonged to
  19. In an experiment, a student cut a transverse section of young stem of a plant which he has taken from…
  20. The given figure shows the T.S of dicot root. Some parts are marked as A, B, C, D, E, & F. Choose the…
  21. Phellogen and phellem respectively denote
  22. The given figures are types of elements (A and B) which constitute one type of complex tissue (c) of…
  23. One of the primary function of the ground tissue in a plant is
  24. Read the following statements and answer the question.Cambium is very active and produces a large number…
  25. The given figure shows T.S. of monocot stem. Identify the correct labelling of A to F marked in the…
  26. Match column-I with column-II and choose the correct option.Column -IColumn -IIA. Bulliform cellsI.…
  27. Trees at sea do not have annual rings because
  28. When we peel the skin of a potato tuber, we remove
  29. Which one of the following statement is incorrect ?Epidermal cell has small amount of cytoplasm and…
  30. The vessel elements of angiosperms differ from other elements of xylem in having