How Many Species Are There

Q.

Mouth parts of cockroach are:

1. Piercing and sucking

2. Sucking and siphoning

3. Biting and chewing

4. Sponging

Q. “Water hyacinth” or Eichhornia is one of the important problematic weeds of static water in India. Which of the following statement is incorrect about it?

1. 
   It is also known as “Terror of Bengal”
2. 
   It is a native plant of India
3. 
   It increases biological oxygen demand of water body
4. 
   It spread rapidly through vegetative propagation

Q.

What are the six different major Levels of Organization?

Q.

Why do the tropics have the greatest levels of species richness?

Q.

How do exotic species threaten ecosystems?

Q.

According to Robert May, the global species diversity is about

1. 50 million

2. 7 million

3. 1.5 million

4. 20 million

Q. Vertical distribution of different species occupying different levels is called

1. energy flow
2. productivity
3. food chain
4. stratification

Q.

How does an invasive species affect an ecosystem?

Q. Which of the following is not an example of alien species invasion?

1. Clarias gariepinus
2. Steller’s sea cow
3. Lantana
4. Eichhornia

Q. Given below is the representation of the extent of global diversity of invertebrates. What groups the four portions (1-4) represent respectively?

1. 1 - Crustaceans
   2 - Insects
   3 - Molluscs
   4 - Other animal groups
   
2. 1 - Insects
   2 - Molluscs
   3 - Crustaceans
   4 - Other animal groups
3. 1 - Molluscs
   2 - Other animal groups
   3 - Crustaceans
   4 - Insects
   
4. 1 - Insects
   2 - Crustaceans
   3 - Other animal groups
   4 - Molluscs

Q.

Select the correct statement about biodiversity.

1. Large scale planting of Bt cotton has no adverse effect on biodiversity.

2. Western Ghats have a very high degree of species richness and endemism.

3. Conservation of biodiversity is just a fad pursued by developed countries.

4. The desert areas of Rajasthan and Gujarat have a very high level of desert animal species as well as numerous rare animals.

Q. Which one of the following is important for speciation ?

1. Behavioural isolation
2. Seasonal isolation
3. Reproductive isolation
4. Tropical isolation

Q.

How do ecologists estimate the total number of species present in the world?

Q.

The main natural regions of the world are _________________. (a) Hot , polar, arctic and antartic (b) Forest , desert, sea, ocean (c) Tropical regions, warm temperate regions, cold temperate regions, Polar regions (d) None of these

Q.

If the given diagram shows global biodiversity of plants; then which option correctly represents ‘X’ & ‘Y’?

1. ‘X’ Fungl; ‘Y’ Algae

2. ‘X’ angiosperms; ‘Y’ Mosses

3. ‘X’ Ferns; ‘Y’ Algae

4. ‘X’ Fungi; ‘Y’ Angiosperms

Q.

What is gene flow example?

Q.

Which phylum is the most abundant one among animals?

1. Dandeli

2. Kudremukh

3. Bhramagiri

4. Sharavathi valley

Q.

How does biodiversity occur?

Q. (a) Define 'speciation'. Explain how speciation occurs.

Q. How many species of animals have been described till now ?

Q.

Does the occurrence of the diversity of animals on earth suggest their diverse ancestry also? Discuss this point in the light of evolution.

Q. Write a short note: Biodiversity.

Q. What are the uses of Biodiversity?

Q.

Arthropods make up around ___ of all the invertebrate species that have been identified.

Q. Who first coined the term biodiversity and in which year?

Q. Animals like owls and badgers, which are active during the night, are said to be nocturnal. What are animals that are active during twilight called?

1. Diurnal
2. Crepuscular
3. Matutinal
4. Vespertine

Q. ___ are the most abundant group of plants.

1. Bryophytes
2. Flowering plants
3. Mushrooms
4. Angiosperms

Q. Order of Mangifera indica is

1. Apiales
2. Liliales
3. Santalales
4. Sapindales

Q. Why should we conserve biodiversity? How can we do it?

Q.

On placing an inverted tumbler over a burning candle, the flame extinguishes after some time. This is because of the non-availability of

1. Oxygen

2. Water vapours

3. Carbon dioxide

4. Wax