State difference between the following: (i) abiotic and bioitic components. (ii) food chain and food web. (iii) producer and consumer. (iv) producer and decomposer. (v) Net Primary production and Gross primary production.

Give the relation between Gross Primary Production and Net Primary Production.

Which of the following species is a primary consumer in the given food web?

Distinguish between (a) Grazing food chain and detritus food chain (b) Production and decomposition (c) Upright and inverted pyramid (d) Food chain and Food web (e) Litter and detritus (f) Primary and secondary productivity .

Out of the following which two methods yield genetically similar plants: (i) Stem cuttings (ii) Seed production (iii) Mutation (iv) Tissue culture

Identify two physiological process induced by two different phytohormones having a common precursor which is formed due to the catalytic activity of pyruvic dehydrogenase complex (I) More female flowers in cucumber (II) alpha -amylase production in barely grain (III) Acceleration of fruit ripening in tomato (IV) Delay in sprouting of potato tubers The correct combination is

Identify two correct statements from the following (i) Rennin is industrially produced by Mucor pusilus (ii) Streptokinase is industrially produced by Pseudomonas pudica (iii) Alkaline serine protease is produced by Bacillus licheniformis (iv) DNA polymerase is produced by Trichoderma reesi

State which of the following are scalars and vectors- (i) density (ii) charge (iii) displacement (iv) energy (v) momentum (vi) volume (vii) time (viii) magnetic field intensity (ix) electric flux (x) force.

Identify the wrong statements from the following : (i) Branches of limited growth in Aspargus perform photosynthesis (ii) Petiole of Australian Acacia helps in climbing (iii) Floral buds of Agave store food materials (iv) Aerial roots of Taeniophyllum helf in vegetative propagation

Go through the following statements (i) The most widely used compound as source of ethylene is ethephon. (ii) Ethylene helps the plants to increa their absorption surface by promotin root growth and root hair formation. (iii) 2, 4 - D is mainly used to kill mature monocotyledonous plants. (iv) Spraying juvenile conifers with GAs has- tens the maturity period, thus leading to early seed production. Which of these are correct

Consider the following statements concerning food chains (i) Removal of 80% tigers from an area resulted in greatly increased growth of vegetation (ii) Removal of most of the carnivores resulted in an increased population of deers (iii) The length of food chains is generally limited to 3 - 4 trophic levels due to energy loss (iv) The length of food chains may vary from 2 to 8 trophic levels Which two of the above statements are correct?