Biology Today — December 2017

27. Which of the following genera have fungal association in
    form of mycorrhiza?
    (a) Pinus (b) Cycas
    (c) Cedrus (d) Sequoia


28. Read the following statements and select the incorrect ones.
    (i) The pollen tube in Cycas is of haustorial nature.
    (ii) In Cycas, antherozoids are motile.
    (iii) The upper fertile portion of the microsporophyll of
    Cycas is called apophysis.
    (iv) The megasporophylls of Cycas are not organised into
    cones instead they occur in close spirals around stem
    apex in acropetal succession.
    (v) The secondary wood of Cycas is pycnoxylic.
    (a) (ii) and (v) (b) (iii) and (v)
    (c) (i) and (iv) (d) (ii) and (iv)


29. Select the haploid structures from the given list.
    (i) Protonemal cell
    (ii) Primary endosperm nucleus of dicot
    (iii) Leaf cell of moss
    (iv) Prothallus cell of fern
    (v) Gemma cup of Marchantia
    (vi) Ovum of a liverwort
    (vii) Zygote of a fern
    (viii) Meristem cell of monocot
    (a) (i), (ii), (iv), (v) and (vi)
    (b) (i), (iii), (iv), (v) and (vi)

(c) (i), (ii), (iii) and (iv)

(d) (i), (ii), (iii), (iv) and (v)

30. Fill the blanks in the given statements and select the correct
    option.
    (i) are peculiar to Selaginella.
    (ii) The sperms of are the largest in the biological
    world.
    (iii) In Marchantia, two types of are anchoring
    smooth walled and capillary conducting tuberculate.
    (iv) causes red rust of tea.

(i) (ii) (iii) (iv)

(a) Rhizome Cycas roots Cephaleuros

(b) Rhizophore Cycas rhizoids Cephaleuros

(c) Rhizophore Eucalyptus rhizoids Scendesmus

(d) Rhizophore Eucalyptus rhizoids Scendesmus

ANSWER KEY

1. (a) 2. (a) 3. (b) 4. (b) 5. (a)


2. (b) 7. (a) 8. (b) 9. (b) 10. (a)


3. (b) 12. (c) 13. (c) 14. (b) 15. (a)


4. (a) 17. (c) 18. (a) 19. (a) 20. (c)


5. (a) 22. (d) 23. (b) 24. (c) 25. (b)


6. (d) 27. (a) 28. (b) 29. (b) 30. (b)
   

Unscramble the words given in column I and match them with their explanations in column II.

Column I Column II

1. IOESNS (a) Rope like twisted subterranean masses of hyphae.


2. XNTOIYCO (b) The common ancestor of great apes and man.


3. ENALVME (c) A type of stipule that fuses to form a hollow tube encircling the stem.


4. EAYAPCR (d) A hormone responsible for vigorous contraction of the uterine muscles.


5. NSATCAUELEC (e) A biopesticide obtained from neem.


6. UPIRSDHEYCTO (f) A state of stunted mental and physical growth due to congenital deficiency
   or thyroxine.


7. IOZSRPHOHMR (g) Special sponge-like tissue found in epiphytic roots.


8. TOEREACH (h) The protein which forms dense, hard matrix of bone.


9. CRIDAZNTAHIA (i) A plant with reduced stem or without stem.


10. MCIENISRT ( j ) The mollusc, used as currency in old days.

U N S C R A M B L E M E

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