CBSE 12th Standard Biology Subject Organisms and Populations Value Based Questions 5 Marks Questions 2021
By QB365 on 31 May, 2021
QB365 Provides the Value Based Question Papers for Class 12 Biology, and also provide the detail solution for each and every Value Based Questions. Value Based Questions will help to get more idea about question pattern in every exams and also will help to get more marks in Exams
QB365 - Question Bank Software
CBSE 12th Standard Biology Subject Organisms and Populations Value Based Questions 5 Marks Questions 2021
12th Standard CBSE
-
Reg.No. :
Biology
-
No species can exist alone in a habitat. Any species has a minimal requirement of at least one more species, on which it can feed. Interspecific interactions arise from the interaction of populations of two different species.
(a) What term is given to the interaction, where one species is benefitted and the other is neutral?
(b) Give four examples of the above kind of interaction.
(c) How do you call the interaction where one species is neutral and the other is harmed? Give an example of such an interaction.
(d) What value do you learn from this?(a) -
'Struggle for existence and survival of the fittest' is Darwin's theory of Natural selection. Interspecific competition, a potent force in organic evolution, is generally believed to occur between closely related species for the same resources, that are limiting, but this is not entirely true.
(a) Give an example where totally unrelated species could compete with each other.
(b) Resources need not be limiting for competition to occur. Justify with an example.
(c) What value is learnt from this?(a) -
Ram saw that in his village farmers always used to plough the field before sowing seeds of any crop.He discussed his observation with his grandfather who explained that this practice helps to improve productivity by providing better aeration, water absorption and availability of nutrients to plants.
Read the above passage and answer the following questions:
(i) What is soil?
(ii) Which factors of soil affect soil fertility?
(iii) What value is displayed by Ram?(a) -
In a biology class, teacher was telling the students that the structures/components and their functions in a watch can be compared with various lenels of organisation we find in nature. Radhika was surprised and asked teacher to explain it. Teacher got impressed with Radhika's interest and explained that there is a systematic arrangement of smaller and simpler components into larger one in a hierarchy or pyramid having different levels where each level and itself is formed of components of lower level and itself becomes part of hgher level for achieving a common goal.
(i) What are the four levels of biological organisation found in nature?
(ii) What is the basic unit of ecological organisation
(iii) Define community
(iv) What value are shown by Radhika?(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)
5 Marks
*****************************************
CBSE 12th Standard Biology Subject Organisms and Populations Value Based Questions 5 Marks Questions 2021 Answer Keys
-
(a) Commensalism
(b) (i) Orchids grow as epiphytes on mango tree or other fruit trees.
Orchids are benefitted by getting a shelter, while the tree is neither benefitted nor damaged.
(ii) Barnacles growing on the whale are benefitted to move where food is available.
(iii) The cattle egrets always forage near to where the cattle animals graze; the cattle animals stir up the ground and the insects are flushed out from the vegetation and make it easy for the egrets to catch them.
(iv) The clown fish living among sea anemones get protection from their predators, which stay away from the stinging tentacles of the sea anemone:
(c) Amensalism
Roots of certain plants secrete chemicals, which are harmful to the soil organisms.
The antibiotics secreted by certain soil fungi are harmful to soil fungi bacteria. (anyone)
(d) Interactions should be beneficial to all concerned. Avoid selfish or selfcentered people. -
(a) In some shallow lakes of South America, the visiting flamingoes and the resident fishes compete for their common food, the zooplanktons in the lake
b) In interference competition.the feeding efficiency of one species is reduced by the interfering and inhibitory presence of the other species, even if the resources are abundant and not limiting e.q. the Abingdon tortoise in Galapagos island became extinct within a decade after goats were introduced into the island.
(c) Work hard and equip yourself to be successful in this competitive world. -
(i) It is defined as the fertile surface of the earth capable of supporting plant growth.
(ii) Mineral matter organic matter, porosity, and living organisms present in the soil affect its fertility.
(iii) Ram was curious to know about things and also wanted to find out reasons. -
(i) Organisms, population, communities and biomes
(ii) Orgnism is the basic unit of ecological hierarcy/organisation.
(iii) Refer to text on page 3000.
(iv) Curiosity and eagerness to learn 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.
5 Marks
