Population Interactions

Q.

What is the difference between an obligate parasite and a facultative parasite?

Q.

Cuscuta is an example of:

1. Autotroph

2. Parasite

3. Saprotroph

4. Host

Q.

Differentiate between parasitic and saprophytic plants, and also give examples.

Q.

List any three types of parasitic adaptations?

Q.

What is symbiosis? Explain with the help of an example.

Q. Which of the following is not a nitrogen fixing cyanobacteria?

1. Anabaena
2. Azotobacter
3. Nostoc
4. Oscillatoria

Q.

What Is Symbiosis? Give one example.

Q. Which of the following is a natural genetic engineer of plants?

1. Yeast
2. Agrobacterium
3. E. coli
4. Mycoplasma

Q.

What is the difference between phycobiont and mycobiont?

Q. Which of the following bacteria help in nitrogen fixation from atmosphere.
I. Azotobacter II. Rhizobium III. Azospirillum IV. Lactobacillus

1. I, III, IV
2. I, II, III, IV
3. II, III, IV
4. I, II, III

Q. Which of the following absorb nutrients from the host directly through their body surface?

1. Taenia
2. Fasciola
3. Planaria
4. Both (A) and (B)

Q.

What are Rhizomorphs?

Q.

How is euglena harmful?

Q.

Association where organisms live together and benefit from each other is called ___.

Q.

Algae and fungi form a symbiotic association called ______.

Q. In a mycorrhizal association, the fungus helps to provide to the roots

1. minerals only
2. water only
3. minerals and water
4. nitrogen containing compounds

Q. On the African plain, large herbivores like black rhinoceros disturb insect communities as they move. Birds like cattle egret feeds on the displaced insects. Neither the displacement of insects nor the activity of birds has any effect on the rhino. Oxpecker (a small dark bird) removes ticks from the skin of the rhino. The bird gets food and the mammals get relief from parasites.
Match the alphabets with the relationship that the organisms possess among themselves and then write only appropriate number in the space against each alphabet.


(1) Predation (2) Parasitism
(3) Commensalism (4) Amensalism
(5) Mutualism (6) Competition

1. $\text{A}\to 5,\text{B}\to 1,\text{C}\to 3,\text{D}\to 2,\text{E}\to 4,\text{F}\to 1$
2. $\text{A}\to 1,\text{B}\to 5,\text{C}\to 4,\text{D}\to 1,\text{E}\to 3,\text{F}\to 2$
3. $\text{A}\to 3,\text{B}\to 2,\text{C}\to 1,\text{D}\to 4,\text{E}\to 1,\text{F}\to 5$
4. $\text{A}\to 2,\text{B}\to 1,\text{C}\to 3,\text{D}\to 1,\text{E}\to 4,\text{F}\to 5$

Q.

Why is commensalism is important in an ecosystem?

Q.

Organisms that obtain food from host organisms is called ____________.

1. Saprophytes

2. Autotrophs

3. Consumers

4. Parasites

Q. Which of the following gene is introduced in plant to protect it from corn borer?

1. cryIAc
2. cryIIAc
3. cryIIAb
4. cryIAb

Q.

Association between blue-green algae and fungi is called as

Q. The interdependent evolution of flowering plants and pollinating insects together is known as-

1. Mutualism
2. Coevolution
3. Commensalism
4. Cooperation

Q. The relation between algae and fungi in a lichen is

1. Commensalism
2. Symbiosis
3. Parasitism
4. Protocoperation

Q. Choose the correct option for the decline in the population of indigenous catfishes in our rivers due to the introduction of Clarias gariepinus.

1. Co-extinction
2. Habitat loss
3. Over-exploitation
4. Alien species invasion

Q. Choose the correct match Bladderwort, sundew, Venus flytrap:

1. Nepenthes, Dionaea, Drosera
2. Nepenthes, Utricularia, Vanda
3. Utricularia, Drosera, Dionaea
4. Dionaea, Trapa, Vanda

Q. Pick the odd one out with respect to their association.

1. Clownfish and sea anemone
2. Egret and cattle
3. Whales and barnacles
4. Black walnut tree and herbaceous plants

Q. Identify the correct statement about population attributes from the following.

1. Population has births and deaths, which are expressed as per capita births and deaths
2. Sex ratio is an population attribute
3. Age pyramids generally shows age distribution of individuals in a separate diagram
4. Population size is more technically called population magnitude

Q. What is the difference between the interaction of orchids with the mango tree and interaction of orchids with bees? [2 marks]

Q.

How do mosses transport water and nutrients?

Q. What is commensalism?