What do you mean by negative interactions between species? Name the type of interactions involved in following examples:
(a) Control of mosquito larvae by Gambusia fish.
(b) Algae and fungus association in lichens.

What do you mean by interspecific interactions ?Explain different types of positive interactions in a biotic community.

Name the kind of interaction between the following - (a) Birds and cattle (b) Termites and flagellates (c) Alga and fungus (d) Plasmodium and humans

What type of population interaction in A,B,C,D between the species A and B as per the tabular column given below .

(i) What is the interaction between two species called ? (ii) Name the association in which one species producers poisonous substance or a change in environmental conditions that is harmful to another species .

What do you mean by the following also give example (a) Non-essemtial amino acids (b) Essential amino acids.

Mr. Kumar runs a small garment making factory in a premises having a roof made of asbestos sheets. These asbestos sheets are supported on long wooden planks are fixed to planks with J-shaped hooks. For the last many days, the workers of factory are complainig to Mr. Kumar that the new clother made by them and kept on hangers are getting spoiled with a red brown powdery substace. Mr. Kumar tried his best but could not locate the surface of this substance which was spoiling theri newly fabricated clothes. One day Mr. Kumar's son Rajesh who is a studen of class X , came to the factory. Mr. Kumar told him the problem which he was facing for the last so many days. Rajesh went near the clothes which had been spoiled, looked up at the roof carefully from that place and understood the problem. He explained everything to his father. He also suggested the measure to be taken to solve this problem. Mr. Kumar was very happy. (a) What is the red -brown powdery substance known as? (b) From where do you think this substance was coming on the newly made garments in the factory? (c) What type of chemical reaction is involved in the formation of red -brown substance? (d) What is the general name of the process in which metals are eaten up by air or moisture, etc? (e) What is the special name of the above process if the metal involved is iron? (f) What suggestion do you think was given by Rajesh to solve this problem? (g) What values are displayed by Rajesh in this episode?

What do you mean by Customer relationship management (CRM)? I. It is a system for managing a company's interactions with current and future customers . II. It is a system for managing a company's interactions with current and past customers . III. It often involves using technology to organize , automate , ans synchronize sales , marketing , customer service , and technical support

(a) What is the difference between displacement and double displacement reactions ? Write equations for these reactions. (b) What do you mean by a precipitation reaction ? Explain an example.