Biology Today — December 2017
Complete the following flow chart by selecting the correct option. Polysiphonia (n) Spermatium A B C D (a) Carpogonium Cystoca ...
(b) female gametophyte lacks archegonia (c) embryo develops in female gametophyte which is retained on parent sporophyte (d) non ...
Which of the following genera have fungal association in form of mycorrhiza? (a) Pinus (b) Cycas (c) Cedrus (d) Sequoia Read th ...
Morphology of Flowering Plants Which of the following statements are correct regarding the roots shown in the given figure? I. ...
A B C (a) Spadix Corymb Catkin (b) Spike Raceme Catkin (c) Spikelet Corymbose Spadix (d) Capitulum Corymb Spike Refer to the gi ...
Select the option which correctly identifies types of flower regarding position of floral parts on thalamus with their examples ...
Read the given statements regarding androecium of a flower and select the incorrect ones. I. Stamen comprises of a stalk-like s ...
Read the following statements and select the correct ones. I. Thorns are modified stem structures with vascular cylinder surro ...
Refer to the given Venn diagram and select the correct option regarding P, Q and R. It is a simple dry fruit. It is single see ...
A B (a) I, IV II, V (b) II, III II, IV (c) I, III II, V (d) I, V III, II Match column I with column II and III and select the c ...
The growth of plant at various stages i.e.,from embryonic stage till maturity, includes both increase in length and girth, which ...
Stelar Growth by Vascular Cambium Against the protoxylem, the cambium forms distinct and widening radial bands of parenchyma tha ...
Since the root lies underground, it is not subjected to variations of aerial conditions and therefore unlike stem, annual rings ...
Activity of Vascular Cambium Rays initials Ray initials form the radial or horizontal system of secondary tissues. Ray initials ...
On the contrary, during unfavourable seasons or inactive period, there is less demand for sap transport as cambium is less acti ...
Softwood and Hardwood Softwood refers to the gymnosperm wood devoid of vessels. It is also called non-porous wood. It is mainly ...
Economic importance of cork Prevention of loss of water by evaporation. Light, compressible, non reactive and fire resistant. Pr ...
CASE STUDY OF SECONDARY GROWTH IN ROOT AND STEM Secondary Growth in Ficus Root Lenticel Cork Cork cambium Secondary cortex Secon ...
Epidermis Single outermost layer with thick cuticle Cortex Several layered parenchymatous cells Hard bast The distinct sieve tub ...
Anomalous growth in dicot stem In a stem, numerous vascular bundles occur in a ring embedded in conjunctive tissue scattered in ...
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