21.

The dark coloured dead wood present in the central region of old tree is

• spring wood

• heart wood

• sap wood

• cambium

Diffusion Pressure Deficit (DPD) is equal to the Osmotic pressure substracted by

• Osmotic Pressure (OP)

• Turgor Pressure (TP)

• Suction Pressure (SP)

• Water Potential (${\mathrm{\psi }}_{\mathrm{w}}$)

Oxygen released in photosynthesis comes outby

• photophosphorylation

• photolysis of water

• photorespiration

• Kelvin cycle

Which ion is used in the protoplast fusion with the PEG (polyethylene glycol)?

• Na⁺

• Ca⁺⁺

• K⁺

• Mg⁺

Glycolate accumulates in chloroplast there is

• low CO₂

• high CO₂

• bright light

• low temperature

The endosymbiotic hypothesis of mitochondrial origin states that

• mitochondria were capable of self-duplication

• mitochondria were initially aerobic bacteria

• mitochondria were chloroplast in the beginning

• mitochondria were part of nucleus

The basic principles of embryonic development were first given by

• Weismann

• Haeckel

• Von Baer

• Malthus

Corpus luteum in mammals occurs in

• brain and connects two cerebral hemispheres

• ovaries and produces progesterone

• heart and initiate contraction

• skin and acts as a pain receptor

Fasciola hepatica (liver fluke) infects its intermediate host and primary host at the following larval stages respectively

• redia and miracidium

• cercaria and redia

• cercaria and metacercaria

• miracidium and metacercaria

Select the correct sequence of stages in the evolution of modern man (Homo sapiens)

• Australopithecus, Homo habilis, Neanderthal, Cro-magnon man, Modern man

• Homo habilis, Neanderthal, Australopithecus, Cro-magnon man, Modern man

• Australopithecus, Neanderthal, Cro-magnon man, Homo habilis, Modern man

• Neanderthal, Australopithecus, Cro-magnon man, Homo habilis, Modern man