Recent questions tagged ch13

Give one example for each of the following:

asked Jul 11, 2017 by pady_1

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While living in and on the host species, the animal parasite has evolved certain adaptations. Descri

asked Jul 11, 2017 by pady_1

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Discuss the various types of positive interactions between species.

asked Jul 11, 2017 by pady_1

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Does light factor affect the distribution of organisms? Write a brief note giving suitable examples

asked Jul 11, 2017 by pady_1

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<div>Do you agree that regional and local variations exist within each biome?</div><div><br></div><d

asked Jul 11, 2017 by pady_1

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Give one example for each of the following types.

asked Jul 11, 2017 by pady_1

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Define zero population growth rate?

asked Jul 11, 2017 by pady_1

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In a pond, we see plants that are free floating ;rooted-submerged: rooted emergent; rooted with floa

asked Jul 11, 2017 by pady_1

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In a sea shore, the benthic animals live in Sandy, muddy or rocky substrata and accordingly develope

asked Jul 11, 2017 by pady_1

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Define heliophytes and sciophytes. Name a pant from your locality that is either a heliophyte or a s

asked Jul 11, 2017 by pady_1

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Why are coral reef not found in the regions from west Bengal to Andhra Pradesh but are found in Tami

asked Jul 11, 2017 by pady_1

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In an aquarium two herbivorous species of fishes are living together feeding on phytoplanktons. As p

asked Jul 10, 2017 by pady_1

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Lianas are vascular plants rooted in the ground and maintain erectness of their stem by making use o

asked Jul 10, 2017 by pady_1

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The density of a population in a habitat per unit area is measured in different units. Write the uni

asked Jul 10, 2017 by pady_1

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Categorise the following plants into hydrophytes, halophytes, mesophytes and xerophytes. Give reason

asked Jul 10, 2017 by pady_1

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Why do submerged plants receive weaker illumination than exposed floating plants in a lake?

asked Jul 10, 2017 by pady_1

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Why do fresh water organisms have contractile vacuoles whereas majority of marine organisms lack the

asked Jul 10, 2017 by pady_1

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If a fresh water fish is placed in an aquarium containing seawater, will the fish be able to survive

asked Jul 10, 2017 by pady_1

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What is brood parasitism? Explain with the help of an example.

asked Jul 10, 2017 by pady_1

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Define Ectoparasite and endoparasite with suitable example.

asked Jul 10, 2017 by pady_1

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What is high altitude sickness? Write its symptoms. 

asked Jul 10, 2017 by pady_1

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What is a diapause and its significance?

asked Jul 10, 2017 by pady_1

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What is homeostasis? 

asked Jul 10, 2017 by pady_1

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Why do high areas have brighter sunlight and lower temperatures as compared to the plains?

asked Jul 10, 2017 by pady_1

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Which element is responsible for causing soil salinity? At what concentration does the soil become s

asked Jul 10, 2017 by pady_1

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What is a tree line?

asked Jul 10, 2017 by pady_1

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Give the scientific name of any two microorganisms inhibiting the human intestine.

asked Jul 10, 2017 by pady_1

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In an association of two animal species, one is a termite which feeds on wood and the other is a pro

asked Jul 10, 2017 by pady_1

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Give a suitable example for commensalism. 

asked Jul 10, 2017 by pady_1

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Define aestivation. 

asked Jul 10, 2017 by pady_1

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What are the organisms that feed on plants sap and other plant parts called?

asked Jul 10, 2017 by pady_1

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What would be the growth rate pattern, when the resources are unlimited? 

asked Jul 10, 2017 by pady_1

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Emergent land plants that can tolerate the salinities of the sea are called?

asked Jul 10, 2017 by pady_1

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What is Mycorrhiza? 

asked Jul 10, 2017 by pady_1

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Name the association in which one species produces poisonous substance or a change in environmental

asked Jul 10, 2017 by pady_1

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What is commensalism? 

asked Jul 10, 2017 by pady_1

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What is the interaction between two species called? 

asked Jul 10, 2017 by pady_1

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Define stenohaline species.

asked Jul 10, 2017 by pady_1

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Species that can tolerate wide range of salinity are called?

asked Jul 10, 2017 by pady_1

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What are eurythermic species? 

asked Jul 10, 2017 by pady_1

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Species that can tolerate narrow range of temperature are called ?

asked Jul 10, 2017 by pady_1

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Suppose a girl throws a die. If she throws a 5 or 6, she tosses a coin 3 times and notes the number of heads. If she gets 1, 2, 3 or 4, she tosses a coin once and notes whether a head or tail is obtained. If she obtained exactly one head, what is the probability that she threw 1, 2, 3 or 4 with a die?

asked Dec 27, 2016 by priyanka.c

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A die is thrown 10 times. If getting a prime number is considered a success, find the probability of getting not more than 8 successes.

asked Dec 20, 2016 by priyanka.c

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If the letters of the word 'ASSASSINATION' are arranged at random in a row, find the probability that
(a) four S's come consecutively in the word
(b) All A's not coming together
(c) two I's and two N's come together.

asked Dec 19, 2016 by priyanka.c

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From a group of 7 men and 4 ladies, a committee o 6 persons is formed. What is the probability that the committee will consist exactly of 2 ladies ?

asked Dec 10, 2016 by priyanka.c

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In a game, a man wins a rupee for a six and loses a rupee for any other number when a fair die is thrown. The man decided to throw a die thrice but to quit as and when he gets a six. Find the expected value of the amount he wins / loses.

asked Dec 8, 2016 by priyanka.c

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A coin is tossed 6 times. What Is the probability that tail appears an odd no of times ?

asked Nov 30, 2016 by priyanka.c

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Event A and B are such that $P(A) = \frac{1}{2}, P(B) = \frac{7}{12} $, P (not A or not B) =$ \frac{1}{4}$. State whether A and B are independent.

asked Nov 23, 2016 by priyanka.c

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Two eggs are drawn successively with replacement from a lot containing 10% defective eggs. Find the probability that there is at least one defective egg.

asked Nov 19, 2016 by priyanka.c

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Two cards are drawn without replacement from a well shuffled pack of 52 cards. Find the probability that one is spade and other is a queen of red colour.

asked Nov 18, 2016 by priyanka.c

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