11.

The organelle of C3 plants, where glyoxylate is formed is

• Chloroplast

• Peroxisome

• Mitochondria

• Cytosol

Chromophore associated with phytochrome of plants is

• Phycobilin

• Beta-carotene  

• Pterin

• Flavin adenine dinucleotide    

Which of the following is produced in phenyl propanoid pathway?

• Phenolics

• Carotenes

• Alkaloids

• Terpenes

Which of the following helps in osmoprotection in plants?

• Proline

• Tryptophan

• Glycine

• Levulinic acid

The dwarf pea mutant (le) used by Mendel was defective in which of the following enzyme involved in gibberellin biosynthesis?

• Ent‐Kaurene synthase

• GA3 β-hydroxylase

• GA 20 oxidase

• Ent‐Kaurenoic acid hydroxylase

Which of the following statements with respect to alternate oxidase activity in cyanide‐resistant respiration in plants is not correct?

• Alternate oxidase accepts electrons directly from cytochrome C

• Some plants exhibit thermogenesis during inflorescence development

• Transcription of alternate oxidase gene is often induced by various abiotic stresses

• When electrons pass to alternate oxidase, two sites of proton pumping are bypassed

In mature Arabidopsis embryo, root apical meristem consists of cells derived from

• Embryo and apical suspensor cells

• Embryo only

• Suspensor only

• Hypophysis only

Na⁺‐K⁺ ATPase is a tetramer of 2α and 2β subunits. On which of the following subunits are the Na⁺ and K⁺ binding sites present

• Both on α

• Both on β

• Na⁺ on α and K⁺ on β

• Na⁺ on β and K⁺ on α

cAMP signaling play a very important role in the development and differentiation of Dictyostelium discoideum. This morphogen is synthesized by different adenylyl cyclase expressed at different stages of its life cycle. The following statements (AD) refer to the effect of mutations in different adenyl cyclase genes

A. aca deficient cells can be allowed aggregate by expressing them to pulse of cAMP.

B. acb deficient cells would form normal fruiting bodies and the spores can germinate when exposed to favourable conditions.

C. acg deficient cells develop normally and the spores germinate in the spore head itself.

D. Spores formed from the acg deficient cells will germinate irrespective of the osmotic conditions.

Which of the above statements are correct?

• A and D

• A only

• A and B 

• C and D

Fill in the blanks (a, b, c and d) in the following statements with a proper
combination of m, n, o, p.
Where in m represents longer; n represents shorter; o represents prevents; p represents inducers.
Shot day (SD) plants flower when night lengths are ___________ a ________ than a critical dark period. Interruption of the dark period by a brief light treatment ______ b ___________ flowering in SD plants. Long day (LD) plants flower when night length is _________ c ___________ than a critical period. Shortening of the night with a brief light treatment _______d____________ flowering in LD plants

• m, o, n, p

• n, p, m, o

• n, o,m, p

• m, p, n, o