BIOLOGY TIMES — January 2018

(ff) #1

  1. (a)

  2. (c) Parenchyma cells having chlorophyll is called
    as chlorenchyma which is present in the mesophyll
    region of the leaves and helps in photosynthesis.

  3. (a)

  4. (b)

  5. (b) Collenchyma is a simple permanent
    mechanical tissue which has pectin deposition in
    the walls.

  6. (b) Epidermis and cork are the protective tissues,
    epidermis is the outermost covering of the plant
    parts and cork is the outer covering of the stem
    often called as bark.

  7. (c) Vessels are the characteristic features of dicot
    plants which differentiates angiosperms from
    gymnosperms.

  8. (c) Sieve tubes elements have broad lumen and
    sieve plate which consists of sieve pores are
    situated at the ends of the tubes.

  9. (a)

  10. (a) Sclerenchyma cells are devoid of protoplasm
    which differentiates from collenchyma

  11. (a) Trichomes are hair-like outgrowth from
    the epidermis of a plant, which are typically
    unicellular and glandular.

  12. (c) Parenchyma cells are loosely arranged with
    intercellular space present in the soft parts of the
    plants.

  13. (d) Calyptrogen is the fourth histogen which
    produces the root cap.

  14. (a)
    25. (c) According to tunica corpus theory, Tunica is
    the outer consisting of meristems- peripheral
    layers of cells, forming the outer region and
    Corpus, the central undifferentiated multi-layered
    mass of cell.
    26. (c) Permanent tissues are stuck at G1 phase of cell
    cycle which is a resting phase and cells are not
    able to undergo mitotic division
    27. (d)
    28. (a) Parenchyma is present in the soft parts of the
    plants, hence it is also present in the mesocarp
    region of the fruit.
    29. (b)
    30. (a) Parenchyma cells are having thin walled cells
    made up of cellulose.
    31. (b) Protoxylem elements are facing towards
    periphery and there are many patches of xylem
    and phloem.
    32. ( c ) G r a s s l e a f a n a t o m y s h o w s u n i f o r m
    distribution of the cells where there is
    undifferentiated mesophyll.
    33. (b)
    34. (a) Palisade parenchyma has more number
    of chloroplast when compared to spongy
    parenchyma.
    35. (d) Scattered vascular bundles is the characteristic
    feature of monocot stem.

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