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For the following questions answer them individually
Select the wrong statement.
‘Diatomaceous earth’ is formed by the cell walls of diatoms.
Diatoms are chief producers in the oceans.
Diatoms are microscopic and float passively in water.
The walls of diatoms are easily destructible.
The label of a herbarium sheet does not carry information on
name of collector
local names
height of the plant
date of collection
Conifers are adapted to tolerate extreme environmental conditions because of
superficial stomata
thick cuticle
presence of vessels
broad hardy leaves
Which one of the following statements is wrong ?
Align is obtained from red algae, and carrageenan from brown algae.
Agar-agar is obtained from Gelidium and Gracilaria.
Laminaria and Sargassum are used as food.
Algae increase the level of dissolved oxygen in the immediate environment.
The term ‘polyadelphous’is related to
androecium
corolla
calyx
gynoecium
How many plants among Indigofera, Sesbania, Salvia, Allium, Aloe, mustard, groundnut, radish, gram and turnip have stamens with different lengths in their flowers?
Four
Five
Six
Three
Radial symmetry is found in the flowers of
Trifolium
Pisum
Cassia
Brassica
Free-central placentation is found in
Argemone
Citrus
Dianthus
Cortex is the region found between
pericycle and endodermis
endodermis and pith
endodermis and vascular bundle
epidermis andstele
The balloon-shapedstructurescalled tyloses
characterize the sapwood
are extensions of xylem parenchyma cells into vessels
are linked to the ascent of sap through xylem vessels
originate in the lumen of vessels
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