Tyloses an outgrowth from ray or axial parenchyma cell into the lumen of a vessel, which partially or completely blocks the cavity are present in

• Periderm

• Heart wood

• Sap wood

• Secondary cortex

The most recent and direct pre-historic ancestor is

• Cro-magnon

• Neanderthal

• Pre-neaderthal

• None of these

Jacob and Monod name some enzymes as allosteric whose activity is regulated by

• End product

• Substrate

• by product

• Coenzyme

 ‘Sun basket’ is

• The device to utilize sun rays directly to meet the requirement of heat energy

• The sufficient amount of sunlight stored in a cell

• A device of taking a sunbath

•  All of the above

The net requirement of assimilatory power for the formation of 6 hexose molecules in maize plant is

• 72 ATP, 48 NADPH

• 90 ATP, 60 NADPH

• 108 ATP, 72 NADPH

• 180 ATP, 72 NADPH

Rauwolffia serpentina is used in

• Curing high blood pressure

• Kidney failure

• Eye defect

• Diabetes

In some organisms, karyokinesis is not followed by cytokinesis as a result of which, the multinucleate condition arises leading to the formation of the syncytium. The perfect example of this is

• The appearance of a furrow in the cell membrane

• Liquid endosperm in coconut

• Sexual reproduction

• Fertilization

The following is the diagram of TS of another. Identify the parts labelled as A, B and C.

• A-Connective, B-Endothecium, C-Pollen grain

• A-Endothecium, B-Connective, C-Pollen grain

• A-Pollen grain, B-Connective, C-Endothecium

• A-Endothecium, B-Pollen grain, C-Connective

Zero growth means

• Natality balance mortality

• Natality is more than mortality

• Natality is less than mortality

• Natality is zero

Ethylene is related with

• Aerobic respiration

• Climacteric phenomenon

• Anaerobic respiration

• Fermentation