Control and Co-ordination — BIOLOGY STD 12 Science — Question

Distinguish between : Atria and Ventricles.

Distinguish between : Neutrophils and Eosionophils.

Read the following and answer any four questions from (i) to (v) given below:
While studying inheritance of characters, a teacher gave the example of inheritance of attached earlobe and hypertrichosis of the ear to her students. A man with attached earlobes and extensive hair on pinna married a woman having free earlobes. The couple had four children, one son with attached earlobes and hairy pinna, one son with a free earlobes and hairy pinna and two daughters with attached earlobes. One of the daughters married a man with free earlobes and sparse hair on pinna. Teacher said if this couple would have sons there would be equal chances for both having free or attached earlobes and sparse hair on pinnae.

1. Attached and free earlobe are respective example of?

1. Dominant and recessive traits.
2. Recessive and recessive traits.
3. Recessive and dominant traits.
4. Dominant and dominant traits.

2. Hypertrichosis of the ear is.

1. X linked trait
2. Y linked trait
3. Autosomal dominant trait
4. Autosomal recessive trait.

3. If a female with attached earlobe married a male homozygous for free earlobe sparse hair on pinna then what would be the chances of daughter to have attached earlobe?

1. 0%
2. 100%
3. 25%
4. 75%

4. If a man with attached earlobe and hairy pinna married a woman with attached earlobe then what would be the chances of son to have hairy pinna?

1. 50%
2. 100%
3. 75%
4. 0%

5. A male with attached earlobe, sparse hair on pinna married a female with attached earlobe. Which of the following is correct regarding their progenies?

1. All sons have a free earlobe with hairy pinna.
2. All daughters have an attached earlobe.
3. 50% daughters have an attached earlobe whereas 50% daughters have a free earlobe.
4. 50% sons have attached earlobe with hairy pinna and 50% sons have a free earlobe

Read the following and answer any four questions from (i) to (v) given below:
ln many species of fig trees, there is a tight one-to-one relationship with the pollinator species of wasp. It means that a given fig species can be pollinated only by its 'partner' wasp species and no other species. The wasp pollinates the fig inflorescence while looking for suitable egg-laying sites. ln return for the favour of pollination, the fig offers the wasp some of its developing seeds as food for the developing wasp larvae.

1. The interaction between fig trees and wasp is an example of:

1. Mutualism
2. Commensalism
3. Amensalism
4. Parasitism

2. AD the given interactions are similar to interaction between fig trees and wasp, except.

1. Plant and animal relation for pollination.
2. Association of algae and fungi in lichens.
3. Association of cattle egret and grazing cattle.
4. Association of fungi and roots of higher plants in mycorrhiza.

3. In which of the following interactions both partners are adversely affected?

1. Parasitism
2. Mutualism
3. Competition
4. Predation

4. ln relationship between fig and wasp:

1. One benefitted other harmed.
2. Both are benefitted.
3. One benefitted other unaffected.
4. One inhibited, other unaffected.

5. Assertion: Fig and wasp cannot complete their life cycle without each other.

Reason: They show mutualistic relationship.

1. Both assertion and reason are true and reason is the correct explanation of assertion.
2. Both assertion and reason are true but reason is not the correct explanation of assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false.

Read the following and answer any four questions from (i) to (v) given below:
Non-native or alien species are often introduced in advertently for their economic and other uses. They often become invasive and drive away the local species. Exotic species have proved harmful to both aquatic and terrestrial ecosystems. For example, water hyacinth (Eichhornia crassipes) was introduced in Indian waters to reduce pollution. It was clogged water bodies including wetlands at many places resulting in death of several aquatic plants and animals.

1. Island water ecosystem are the most vulnerable due to:

1. Small size.
2. Small number of species.
3. Increases reproductive capacity.
4. Both (a) and (b).

2. Which of the following is not an alien species?

1. Lantana camara.
2. Periplaneta americana.
3. Nile Perch.
4. Yucca moth.

3. Second major cause of species extinction is:

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

4. Assertion: Eichhomia crassipes drains off oxygen from water and can be seen growing in standing water.

Reason: Eichhornia crassipes is an indigenous species of India.

1. Both assertion and reason are true and reason is the correct explanation of assertion.
2. Both assertion and reason are true but reason is not the correct explanation of assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false.

5. The population of species Pin a certain conununity was constant until a population species Q from a distant land was subsequently introduced into that community. The interaction between the two populations is reflected in the graph below.

What could be the possible reason for the decrease in the population of species P over a number of days?

1. Species Q is a predator of species P.
2. Species Q is a prey species which wiped out the population of species P.
3. Species P and Q compete for space but feeds on different food.
4. None of these.

Distinguish between: Hypohydrophily – Epihydrophily

Read the following and answer any four questions from (i) to (v) given below:
Excessive exploitation of species, whether a plant or animal reduces the size of its population so it becomes vulnerable to extinction. Such as Dodo and passenger pigeon have become extinct due to over exploitation by humans. Thus the world is facing accelerated rates of species extinctions, largely due to human interference.

1. Which of the following cause of biodiversity loss is not included in evil quartet?

1. Coextinction.
2. Pollution.
3. Alien species invasion.
4. Habitat loss and fragmentation.

2. Identify the species that have become extinct due to over exploitation.

1. Stellar sea cow.
2. Yucca moth.
3. Blatta orientalis.
4. Nile Perch.

3. Factors which make species susceptible to extinction are:

1. Large population size.
2. Lack of genetic variability.
3. Ower status of trophic level.
4. Ability to switch over to ahem ate foods.

4. Assertion: Pollution reduces species biodiversity.

Reason: Spill over of oil in sea causes death of several marine animals.

1. Both assertion and reason are true and reason is the correct explanation of assertion.
2. Both assertion and reason are true but reason is not the correct explanation of assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false.

5. ________ is the first major cause of species extinction.

1. Coextinction.
2. Over exploitation.
3. Habitat destruction.
4. Alien species invasion.

Distinguish between : Communicable and non-communicable diseases.