biology

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1 point

which of the following cellular parts is correctly described?

ribosomes - those on chloroplasts are large (80s) while those in the cytoplasm are smaller (70s)

lysosomes - optimally active at a pH of above 8.5

thylakoids - flattened membranous sacs forming the grana of cholroplasts

centrioles - sites for active RNA synthesis

1 point

identify the stage when homologous chromosomes segregates but their sister chromatids remain associated at centromere

anaphase I

anaphase II

metaphase I

metaphase II

1 point

Guttation is a result of

diffusion

osmosis

trsnspiration

root pressure

1 point

The rupture and fractionation do not usually occur in the water column in vessel/tracheids during the ascent of sap because of

Weak gravitational pull

Lignified thick wall

Transpiration pull

Cohesion and adhesion

1 point

For its action nitrogenase requires

Light

Super oxygen radical

High input of energy

Mn 2+

1 point

Two cells A and B are contiguous. Cell A has osmotic pressure 10 atm. Turgor pressure 7 atm. and diffusion pressure deficit 3 atm. Cell B has osmotic pressure 8 atm. Turgor pressure 3 atm. and DPD 5 atm. The result will be

No movement of water

Movement of water from A to B

Equilibrium between the two

Movement of water from cell B to A

1 point

which of the following structure is an organelle within an organelle?

mesosome

ribosome

peroxisome

1 point

CAM helps the plant in

Disease resistance

Secondary growth

Reproduction

Conserving water

1 point

which one of the following is not considered as part of endomembranous system

peroxisome

vacuole

lysosome

golgi complex

10.

1 point

plant cell normally lacks

CELL MEMBRANE

centriole

golgi apparatus

ribosome

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