ncert solutions for class 7 social science geography chapter 5
which factors affect the movement of ocean water?
factors affecting the movement of ocean water: temperature earthquake or volcanic eruption gravitational pull of the sun and the moon underwater landslides rotation of the earth.
i neeeed help aswell 17 questions connexus 7th grade five factors are known to affect allele frequency in populations i.e., hardy-weinberg equilibrium. these are gene migration or gene flow, genetic drift, mutation, genetic recombination and natural selection.gene migration or gene flow – it is movement of alleles into a gene pool or out of a gene pool. when this movement of alleles takes place gene frequencies change in the original as well as in the new population. new genes/alleles are added to the new population and these are lost from the old population. this will lead to a gene flow if this gene migration, happens multiple times.genetic drift – if the movement of alleles into a gene pool or out of a gene pool takes place by chance it is called genetic drift. this always influences frequencies of alleles and s inversely proportional to the size of the population. it sometimes result into founder effect i.e., when a small group of individuals get isolated from a larger population to form a new population. genetic drift may result into reduced genetic variation.mutation – is the large difference arising suddenly in a population, they are random and occur in all directions.natural selection – is a process in which heritable variations enabling better survival are enabled to reproduce and leave greater number of progeny. that is nature selects only those traits which help an organism to survive in the changed conditions. those that are not fit for survival perish in the long run leading to evolution of new species.genetic recombination – production of new offspring with traits which differ from parents is called genetic recombination. the distance covered by a car in 5 h if it is moving with a speed of 75 km/h is\_\_\_\_\_\_\_\_? autonomic movements are caused due to some inner causes like
changes in turgor pressure , growth movements etc
paratonic movements are caused by external stimulations like
water, chemicals, light, gravity etc challenges facing northern eurasia quiz
100% correct 
1. d
2. b
3. islam then eastern orthodox church
4. a
5. a
6. b
7. shrinkage of the arial sea solution: there are five common features in stanza 2. these features are the sun, the air, the water, peaceful harvest, hands and the labour. 'no' is the answer to your first paragraph question. the tree moves slightly after being hit, thus conserving momentum. the tree soon stops swaying and reverses direction due to forces applied to the roots by the soil.

your second paragraph does not correctly state the law of conservation of energy. you are talking about momentum conservation. in the case of the tree hit by the snowball, there is a net force applied to the system (at the tree's roots). chapter 5 key: electron: e                         number: # ­                 valence electron: ve   three­dimensional: 3d molecular: molec               with: w/ chemical: chem                 different: diff positive: pos negative: neg i. bonding theories ­ a. valence shell e pair repulsion (vsepr)  valence shell e pair repulsion: model predicting the arrangements of ve  ­ pairs around a central atom that minimizes their mutual repulsion  electron pair geometry: 3d arrangements of bonding pairs andn lone pairs  of e about a central atom  molecular geometry: 3d arrang answer: k=7 (i) adsorption is a surface phenomenon that causes the accumulation of molecules of a substance at the surface of a solid or liquid rather than in the bulk. in adsorption, the substance gets concentrated at the surface only. it does not penetrate through the surface to the bulk of the solid or liquid. for example, when a chalk stick is dipped into an ink solution, only its surface becomes coloured.


on the other hand, the process of absorption is a bulk phenomenon. in absorption, the absorbed substance gets uniformly distributed throughout the bulk of the solid or liquid. for example, when a sponge is dipped in water the whole sponge gets wets.


(ii)according to the schulze-hardy rule, the effectiveness of the salt causing flocculation depends on the charge on the ion of opposite sign to the charge on the sol particles. the greater the magnitude of the opposite charge, the higher the ability of a salt to coagulate the sol.  
thus, trivalent salt alcl3 is more effective in causing the coagulation of a negatively charged sol than divalent salt mgcl2.


(iii)out of sulphur sol and proteins, sulphur sol forms multimolecular colloids. sulphur sol consists of particles containing a thousand or more s8 molecules. on the other hand, proteins form macromolecular colloids.