Home
Class 12
BIOLOGY
Justify with the help of two examples wh...

Justify with the help of two examples where a deliberate attempt by humans has led to the extinction of a particular species on earth.

Text Solution

Verified by Experts

Steller.s seacow, Passenger pigeon and many marine fish populations, which are over harvested, have led to the endangering of some commercially important species.
Promotional Banner

Topper's Solved these Questions

  • II PUC BIOLOGY (P.U. BOARD LATEST MODEL QUESTION PAPER - 3)

    SUNSTAR PUBLICATION|Exercise PART - C|8 Videos

  • II PUC BIOLOGY (P.U. BOARD LATEST MODEL QUESTION PAPER - 3)

    SUNSTAR PUBLICATION|Exercise PART - D (Section I)|12 Videos

  • II PUC BIOLOGY (P.U. BOARD LATEST MODEL QUESTION PAPER - 3)

    SUNSTAR PUBLICATION|Exercise PART - D (Section I)|12 Videos

  • II PUC BIOLOGY (P.U. BOARD LATEST MODEL QUESTION PAPER - 2)

    SUNSTAR PUBLICATION|Exercise PART - D (Section - II)|9 Videos

  • II PUC BIOLOGY (SUPPLEMENTARY EXAM QUESTION PAPER JUNE - 2019)

    SUNSTAR PUBLICATION|Exercise PART - D( SECTION - II)|6 Videos

Similar Questions

Explore conceptually related problems

(a) What is adaptive radiation. (b) Explain with the help of suitable example where adaptive radiation has occurred to represent convergent evolution.

Study the four statement (i-iv) given below and select the two correct ones out of them (i) A lion eating a deer and a sparrow feeding or grains are ecologically similar in being consumers. (ii) Predator star fish Pisaster helps in maintaining species diversity of some invertebrates (iii) Predators ultimately lead to the extinction of prey species (iv) Production of chemicals such as nicotine, strychnine by the plants are metabolic disorders The two correct statements are

(a) In humans, males are heterogametic and females are homogametic, Explain. Are there any examples where males are homogametric and females are heterogametic ? (b) Also describe as to, who determines the sex of an unborn child ? Mension whether temperature has a role in sex determination.

A particular species ‘X’ has more characteristics with species 'Y', whereas another species 'Z' has less common characteristics with species 'Y'. Which two species are more closely related? Why? On what basis are the eukaryotic organisms further classified? Why is this basis important? What is the importance of homologous organs?

(i) A husband has 46 chromosomes, his wife has 46 chromosomes. Then why don't their offsprings have 46 pairs of chromosomes, which is obtained by the fusion of male and female gametes? (ii) "Geographical isolation is not a major factor in the speciation of a self pollinating plant species." Justify this statement with the help of an example.

A natural occurring class of plant hormones cytokinins has been found to help increase cotton yields during drought conditions. It has been observed that young cotton seedlings have small root system, making it difficult for them to reach available soil water. Cytokinins assists the young plants in water stress defences, promoting the plant to quickly build a bigger root system to access deep soil mosture. To be effective this phytohormone should be at an early stage of development. "Plant hormones help to co - ordinate growth." Justify the statement by giving three examples.

Consider the following statement (a-d) each with one or two blanks (a) Brears go into (1) ______during winter to (2)_____cold weather (b) A conical age pyramid with a broad base represents (3)_____human population. © A wasp pollinating a fig flower is an example of (4)_____ (d) an area with high levels of species richness is known as (5)_____ which one of the following options, gives the correct fill ups for the respective blank numbers from (1) to (5) in the statements:-

The boiling point elevation and freezing point depression of solutions have a number of partical applications. Ethylene glycol (CH_(2)OH-CH_(2)OH) is used in automobile radiatiors as an antifreeze because it lowers the freezing point of the coolant. The same substance also helps to prevent the radiator coolant from boiling away by elevating the boiling point. Ethylene glycol has low vapour pressure. We can also use glycerol as an antifreeze. In order for the boiling point elevation to occur, the solute must be non-volatile, but no such restriction applies to freezing point depression. For example, methanol (CH_(3)OH) , a fairly volatile liquid that boils only at 65^(@)C , is sometimes used as an antifreeze in automobile radiators. 124 g each of the two reagents glycol and glycerol are added in 5 kg of water of the radiators in two cars. Which of the following statements is wrong?