Choose the correct sequence of stages of growth curve for Bacteria
Choose the correct sequence of stages of growth curve for Bacteria
- Leg, Log, stationary, Decline phase
- Leg, Log, Stationary phase
- Stationary, Leg, Log, Decline phase
- Decline, Leg, Log phase
The Correct Option is A
Solution and Explanation
The correct option is (A) : Leg, Log, stationary, Decline phase
The growth cycle contains four distinct stages, which are: 1. The lag phase, which occurs just after the cells are infused into new medium, is when enzymes, proteins, and RNA are synthesised. 2. Exponential (log) phase, during which all cells routinely undergo binary fission divisions and expand by geometric progression. Depending on the make-up of the growth medium and the incubation circumstances, the cells divide at a consistent pace. 3. Stationary phase: In a culture, exponential development cannot go on indefinitely. One of three things can prevent population growth: running out of nutrients; building up inhibitory metabolites or end products; or running out of room (also known as running out of biological space). 4. Death phase—this phase comes next if incubation continues after the population reaches stationary.
Top Questions on organisms and populations
- What do ‘a’ and ‘b’ represent in the following population growth curve?
- NEET (UG) - 2024
- Biology
- organisms and populations
Match List I with List II.
List I (Interacting species)
List II (Name of interaction)
A Leopard and a Lion in a forest/grassland I Competition B A Cuckoo laying egg in a Crow’s nest II Brood parasitism C Fungi and root of a higher plant in Mycorrhizae III Mutualism D A cattle egret and a Cattle in a field IV Commensalism Choose the correct answer from the options given below
- NEET (UG) - 2023
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Match List I with List II:
List I (Interaction) List II (Species A and B) A. Mutualism I. +(A), O(B) B. Commensalism II. –(A), O(B) C. Amensalism III. +(A), –(B) D. Parasitism IV +(A), +(B) Choose the correct answer from the options given below:
- NEET (UG) - 2023
- Biology
- organisms and populations
- Match List I with List II.Choose the correct answer from the options given below:
List I
List II
A Logistic growth I Unlimited resource availability condition B Exponential growth II Limited resource availability condition C Expanding age pyramid III The percent individuals of pre-reproductive age is largest followed by reproductive and post reproductive age groups D Stable age pyramid IV The percent individuals of pre-reproductives and reproductive age group are same - NEET (UG) - 2023
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- In the exponential growth model equation
\( dN/dt = rN \)
'N' stands for:- CUET (UG) - 2023
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Questions Asked in NEET exam
- Match List I with List II :Choose the correct answer from the options given below :
List - I List – II A. Residual Volume i. Maximum volume of air that can be breathed in after forced expiration B. Vital Capacity ii. Volume of air inspired or expired during normal respiration C. Expiratory Capacity iii. Volume of air remaining in lungs after forcible expiration D. Tidal Volume iv. Total volume of air expired after normal inspiration - NEET (UG) - 2024
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- In an ecosystem if the Net Primary Productivity (NPP) of first trophic level is 100x (kcal m-2)yr-1, what would be the GPP (Gross Primary Productivity) of the third trophic level of the same ecosystem?
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- These are regarded as major causes of biodiversity loss:
A. Over exploitation
B. Co-extinction
C. Mutation
D. Habitat loss and fragmentation
E. Migration
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List I List II A Robert May I Species-Area relationship B Alexander von Humboldt II Long term ecosystem experiment using out door plots C Paul Ehrlich III Global species diversity at about 7 million D David Tilman IV Rivet popper hypothesis - NEET (UG) - 2024
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- Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : The potential (V) at any axial point, at 2 m distance(r) from the centre of the dipole of dipole moment vector \(\vec{P}\) of magnitude, 4 × 10-6 C m, is ± 9 × 103 V.
(Take \(\frac{1}{4\pi\epsilon_0}=9\times10^9\) SI units)
Reason R : \(V=±\frac{2P}{4\pi \epsilon_0r^2}\), where r is the distance of any axial point, situated at 2 m from the centre of the dipole.
In the light of the above statements, choose the correct answer from the options given below :- NEET (UG) - 2024
- Magnetic Field
Concepts Used:
Organisms and Populations
Organisms:
An attached living system that lives in an environment is commonly known as an organism. These organisms are able to retain certain behaviors and structures. Some examples of organisms are plants, animals, bacteria, fungi, and humans. A group of these organisms leads to the formation of a population. The collection of the population forms a community that assists in the operation of ecosystems.
Each and every organism has the ability to adapt itself to various conditions of the environment. This capacity of organisms is due to their genetic variations. It is due to this only that their probability of survival get increases. For instance, camels adapt themselves to survive in desert areas and polar bears adapt to the extreme cold conditions or situations through their dense fur coat.
Populations:
A collection of organisms or individuals of a species that live, at a specific time, in a geographical area that is well-defined and capable of interbreeding is described as a population.
Read More: Organisms and Populations