CBSE 12th Standard Biology Subject Organisms and Populations Value Based Questions 5 Marks Questions With Solution 2021
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CBSE 12th Standard Biology Subject Organisms and Populations Value Based Questions 5 Marks Questions With Solution 2021
12th Standard CBSE
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Reg.No. :
Biology
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Organisms remain as individuals but interact as a group with other organisms and physical habitats and behave as population, community, ecosystem, etc.
(a) What according to you, are the factors that account for the formation of major biomes?
(b) Name any four major biomes of India.
(c) What value is learnt from this statement?(a) -
Water is the most important factor influencing the life of organisms. Life on earth originated in water and cannot be sustained without water. Organisms living in water bodies (ocean, lake, river, etc.) also face water-related problems.
(a) How are aquatic animals affected by the quality of water? Explain.
(b) Mention any four adaptations the desert plants have, to live there successfully.
(c) Represent the value learnt.(a) -
Himani while watching a TV programme based on life in polar region observed that all animals in polar regions possess larger size. Also, smaller animals are not found in that region. She asked about this surprising fact to her teacher.
(i) why smaller animals (e.g. humming birds) are rarely found in polar regions?
(ii) What are the adaptations shown by polar animals?
(iii) What are the chief characteristics of polar region animals?
(iv) What values are shown by Himani?(a) -
A group of students visited a botanical garden, where they saw fungus growing on roots of higher plants only. They were confused seeing it then, their teacher told them that it is an interspecific interaction in which both species can be benefitted.
(i) Write the name of this particular association
(ii) How both are benefitted from each other?
(iii) State use of this interaction to a farmer
(iv) What values are shown by students(a) -
Ramesh went to an excursion trip to Kumaun hills, along with his classmates, under an escort teacher. On reaching the destination, he all of a sudden started feeling nausea, heart pulpitation and fatigued. One of his friends and a classmate suggested him to take rest for some time.
Answer the following questions on the basis of above information::
(i) Suggest the reason of his not feeling well suddenly
(ii) Why did his friend advise him to take rest for some time?
(iii) What values were exhibited by his friend?(a)
5 Marks
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CBSE 12th Standard Biology Subject Organisms and Populations Value Based Questions 5 Marks Questions With Solution 2021 Answer Keys
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(a) The factors include
(i) The rotation of the earth around the sun and the tilt of its axis cause annual variation in the intensity and duration of temperature, which affects distinct reasons.
(ii) Annual variation in precipitation.
(b) (i) Scorching deserts of Rajasthan.
(ii) Rain-soaked Meghalaya forests
(iii) Deep ocean trenches.
(iv) Tropical rain forests
(v) High mountain tops. (any four)
(c) Interactions are necessary; they should be beneficial to all. -
The chemical composition and pH of water are important to affect the animals.
Some animals can tolerate only a narrow range of salinity and are called stenohaline.
Some animals can tolerate a wide range of salinity and are called euryhaline.
Many freshwater fishes can not live for long in sea water and vice versa, because of the osmotic problems, they would face in such waters.
(b) (i) The leaves are reduced to spines.
(ii) The stem is green, flattened, spongy and takes over the function of photosynthesis .
(iii) A thick cuticle prevents loss of water.
(iv) They have a special photosynthetic mechanism (CAM), that enables their stomata to remain closed during day and open during night.
(c) Water is the most precious resource, use it judiciously and think of programs for its conservation. -
(i)Smaller animals are rarely found in polar regions because such animals have surface area relative to their volume and they tend to loose heat very fast when it is cold outside. This is they are rarely found in polar regions
(ii) Animals that live in polar regions are adaptable to polar environments by features like the presence of thick skin coat, tendency to change colour or camouflage to white in snow and high metabolic rate. These features allow animals to adapt in colder environments.
(iii) Chief characteristics of polar region animals are:
(a) large sizes
(b) hairy skin
(c) lipid layer beneath the skin
(iv) Himani showed curiosity and eagerness for learning new things -
(i) Mycorrhizae
(ii) In this association, fungi help the plants in absorption of nutrients, while plants provide food for the fungus.
(iii) (a) It optimises the use of fertilisers, especially phosphorus
(b) It increases crop yield and plant tolerance to saline environments.
(iv) Students are curious towards science and biological aspects. -
(i) Ramesh suffered from attitude sickness because he could'nt get sufficient oxygen due to low atmospheric pressure at a high attitude.
(ii) His friend advised him to take rest for some time because he thought that after a short rest period his body would get acclimatized to the atmospheric conditions prevailing at the high attitude
(iii) Values exhibited by Ramesh's friend-awareness and helpful nature.
5 Marks
