(a) Which kind of pyramid of number present in grassland ?
(b) Write the name of different organisms present at various tropic level in grassland.
(c) At which tropic level you place frog in grassland

In an aquatic ecosystem, the organism present at the trophic level equivalent to cows in grasslands is

Write the name of different plants parts in which chromoplast, chloroplast and Leucoplast are present.

Consider the following statements and select the correct option stating which ones are true (T) and which ones are false (F). (i) Pyramid of biomass is upright in the forest ecosystem and inverted in the grassland ecosystem. (ii) Pyramid of numbers is inverted in grassland and upright in aquatic ecosystem. (iii)Pyramid of energy depicts the rate of energy flow or productivity at successive trophic levels . (iv) Ecological pyramids have no place for detritivores and decomposers though they play an important role in an ecosystem.

(a) At which trophic level you place mollusca in Aquatic ecosystem (b) Priamary carnivores is repsent at which trophic level. (c) GPP- ?= NPP

(a) Name the major parts of the human brain. (b) Name the part of brain responsible for maintaining the posture and balance of the body. (c) Which tropic movement is responsible for the growth of pollen tubes towards ovules ?

Suppose Euphorbia and maize are grown in the tropical area. (a) Which one of them do you think will be able to survive under such conditions ? (b) Which one of them is more efficient in terms of photosynthetic activity ? ( c) What different do you think are there in their leaf anatomy ?

Monosaccharides contain carbonyl group hence are classified, as aldose or ketose. The number of carbon atoms present in the monosaccharide molecule are also considered for classification. In which class of monosaccharide will you place fructose?

(a) Name one gustatory receptor and one olfactory receptor present in human beings. (b) Write a and b in the given flow chart of neuron through which information travels as an electrical impulse. Dendrite rarr a rarr b rarr End point of Neuron

(a) Name the gas which is liberated when an acid reacts with a metal ? How will you test the presence of this gas ? (b) Write the chemical equation for the reaction of zinc metal with (i) Hydrochloric acid and (ii) With sodium hydroxide. Write the chemical name of salt obtained in each case. (c) Identify the acid and base for ammonium chloride salt. What would be the nature of this salt ? mention the pH range of this salt.

Use the information and data given below to answer the question (a) to (c), Stronger intermolecular forces result in higher boiling point. Strength of London forces increases with the number of electrons in the molecule. Boiling point of HF, HCl, HBr and HI are 293 K, 189 K, 206 K and 238 K respectively. (a) which type of intermolecular forces are present in the molecules HF, HCl, HBr and HI ? (b) Looking at the trend of boiling points of HCl, HBr and HI , explain out of dipole-dipole interaction and London interaction, which one is predominant here. (c) Why is boiling point of hydrogen fluoride highest while that of hydrogen chloride lowest ?