Question

Match items in column 1 with those in column 2-

S.N	Column I	S.N	Column II
A	Coralloid roots	1	Cycas
B	Manoxylic wood	2	Mass of seeds dispersed
C	Schizogenous canals	3	Stores blue green algae
D	Sulphur shower	4	Resin duct of conifers
		5	Mass of pollen

A) A-1, B-3, C-5, D-4
B) A-3, B-1, C-4, D-5
C) A-3, B-4, C-1, D-5
D) A-1, B-4, C-3, D-5

Answer 1

Hint: Cycas, conifers are the group of gymnosperms. These are the plants which contain seeds but the seeds are not present in an ovary or a fruit. They are directly open to the air and fertilised by pollination.

Complete answer:
Coralloid roots are a character of Blue Green Algae which are used in nitrogen fixation, they provide ammonia to the plant. Lenticels are present in these roots which help in exchanges of gases. Coralloid roots exhibit symbiotic association with cyanobacteria (also called blue-green algae). They fix nitrogen in association with root tissues, and produce beneficial amino acids such as asparagine and citrulline. Thus the correct match is 3.

Monoxylic wood is present in cycas in which the alternating rings of phloem are present. Wood of this type is non-compact and has a large amount of parenchyma. Large pith and cortex are present having less amount of xylem tracheids or wood. Starch grains fill up the parenchymatous cells. It is not a commercially important wood due to its less durability. The correct match is 1.

Schizogenous canals or cavities are bounded by a layer of secretory cells, they also store resin. These are present in the resin duct of conifers. These cavities are formed by the separation of cell walls from each other along areas of their contact forming intercellular spaces. The intercellular substance dissolves partly and becomes large in size. The correct match is 4.

Sulphur shower is the mass of pollen from a pine plant. It usually occurs in the spring season. These pollens are dispersed by the wind to the female coniferous plants. The correct match is 5.

So, the correct answer is option B. A-3, B-1, C-4, D-5.

Note: The pine tree bears cones and is called coniferous plants. They have vascular tissue. The sulphur shower is the release of yellow pollen in the air. It is the mode of pollination and reproduction in pine trees.