Now-a-days cornea transplantation is very popular. The reason is that it

• is easy to preserve

• transplanted very easily

• can be easily obtained

• does not link with blood supply and immune system

Pneumatophores (respiratory roots) are found in

• Pistia

• Calobranchia

• Rhizophora

• All of these

In C₄ plants, CO₂ combines with

• phosphoglyceric acid

• ribulose diphosphate

• phosphoenol pyruvate

• phosphoglyceraldehyde

Maximum absorption of light occurs in the region of

• 400 - 700 nm

• 700 - 900 nm

• 1000 - 1200 nm

• 1500 - 2000 nm

The red colour of 'red sea' is due to which of the following blue-green algae?

• Chlamydomonas nivalis

• Anabaena

• Microcystis

• Trichodesmium

• Wallace

• Virchow

• Schleiden

• None of these

The part of mushroom comes out from soil is called

• basidiocarp

• ascogonium

• ascocarp

• pericarp

Which one of the following elements is almost non-essential for plants?

• Ca

• Mo

• Zn

• Na

Mycorrhiza is correctly described as

• symbiosis of algae and fungi

• relation of ants with the stem of some trees

• parasitic association between roots and some fungi

• symbiotic relationship between fungi and roots of some higher plants

Which is a typical example of 'feedback inhibition'?

• Allosteric inhibition of hexokinase by glucose-6-phosphate

• Reaction between succinic dehydrogenase and succinic acid

• Cyanide and cytochrome reaction

• Sulpha drugs and folic acid synthesizer bacteria