1.

Which of the following pair of characters distinguish Gnetum from Cycas and Pinus?

• Abscence of resin duct and leaf venation

• Prasence of vessel elements and absence of archegonia

• Perianth and two integuments

• Embryo development and apical meristem

Fruit ripening is promoted by the hormone that also

• promotes thinning of fruits in cherry and walnut

• induce parthenocarpy in tomato

• promote flowering in lemma

• induce dormancy

A plant cell is placed in a solution whose solute concentration is twice as great as the concentration of the cell cytoplasm. The plasma membrance is selectively permeable, allowing water but not solutes to pass through. What will happen to the cell?

• The cell will swell because of endosmosis

• The cell will shrivel because of exosmosis

• The cell will shrivel because of active transport of water

• No change will occur because of hard impervious cell wall present

Statement I:- $\mathrm{\alpha }$-ketoglutarate dehydrogenase catalyses the conversion of oxalosuccinic acid to $\mathrm{\alpha }$-ketoglutarate.

Statement II:- This reaction is accompained with release of CO₂.

Choose the correct option.

• Statement I is correct and statement II is incorrect

• Statement II is correct and statement I is incorrect

• Both statements correct

• Both statements incorrect

As compared to sun plants, the plants, which are adopted to low light intensity possess

• more extended root system

• very high rate of CO₂ fixation

• larger photosynthetic units

• more extended shoot system

Match the following electron transport chain (ETC) inhibitors with their mode of action.

Column I	Column II
A. Dinitrophenol (2,4- DNP)	1. Electron flow from cyt a3 to O2
B. Cyanide	2. Direct electrons from Co-Q to O2
C. Antimycin-A	3. Electron flow from NADH/FADH2 to Co- Q
D. Rotenone	4. Electron flow from Cyt- b to Cyt- c

• A - 2; B - 4; C - 1; D - 3

• A - 2; B - 1; C - 4; D - 3

• A - 3; B - 4; C - 1; D - 2

• A - 1; B - 2; C - 3; D - 4

All given statements regarding cymose inflorescence are correct except

• main axis terminate in a flower

• development of flowers is basipetal

• opening of flowers is centrifugal

• unlimited growth of axis

The leaves of some plants contain crystals of calcium carbonate in epidermal cells, giving appearance that of bunch of grapes are called

• cystoliths

• sphaeraphides

• raphides

• otoliths

The name of this class is based on sexual structure as the site of karyogamy and meiosis in

• Phycomyctes and Actinomycetes

• Deuteromycetes and Zygomycetes

• Ascomycetes and Basidiomycetes

• Basidiomycetes and Actinomycetes

Which of the following feature cannot be considered to distinguish underground stem from a root?

• Presence of nodes and internodes

• Presence of axillary and terminal buds

• Absence of scale leaves and adventitious roots arising from nodes

• Presence of exogenous branches