Biology · Science General

Diversity in Living Organisms

3,323 Questions

The diversity in living organisms deals with the classification of life forms into various kingdoms and phyla. This topic covers specific traits of bacteria, animal body cavities, and structural adaptations for survival. These fundamentals are crucial for biology sections in medical entrance and state board exams.

Animal phyla characteristicsBacteria and flagellaBiological adaptationsKingdom Animalia classificationBody cavity typesExtinct organism subphylaJawless animals identification

Diversity in Living Organisms Questions

Multiple choice bio-chemistry unit of living - cell eukaryotic cell kinds of cell introduction to eukaryotic cell

Which of the following statements is true for eukaryotic cells?
i) They have unicellular cells only.
ii) They have a well organized nucleus.
iii) They have lysosomes and peroxisomes.
iv) Blue green algae are eukaryotic cells.

  1. ii and iii

  2. ii only

  3. i and ii

  4. i and iv
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Eukaryotic cells are multicellular cells. They have a well organized nucleus enclosed within nuclear membrane. They have cell organelles like mitochondria, chloroplast, lysosomes, peroxisomes, Golgi bodies, etc. Prokaryotic cells are unicellular cells. They do not have nuclear membrane. Blue green algae are prokaryotic cells as they do not have  membrane bound organelles and nucleus.

Thus, the correct answer is 'ii and iii'.

Multiple choice bio-chemistry unit of living - cell eukaryotic cell kinds of cell introduction to eukaryotic cell

Which one of these is not a eukaryote?

  1. Euglena

  2. Anabaena

  3. Spirogyra

  4. Agaricus
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Eukaryotes are organisms whose cells have a nucleus enclosed within membranes, unlike prokaryotes, which have no membrane-bound organelles.
Anabaena is a genus of filamentous cyanobacteria that exist as plankton. They are known for nitrogen-fixing abilities and are prokaryotes.
Euglena is a genus of single-cell flagellate eukaryotes.
Spirogyra is a filamentous chlorophyte green algae, which is also a eukaryote.
Agaricus is a genus of mushrooms containing both edible and poisonous species, and are eukaryotes.
So the correct option is B.
Multiple choice bio-chemistry unit of living - cell eukaryotic cell kinds of cell introduction to eukaryotic cell

Consider the following statements regarding characters of Archaebacteria that they share with eukaryotes:
I. The cell wall does not contain peptidoglycan.
II. DNA associated with histones.
III. Translation initiated with formylated methionine.
IV. RNA polymerase similar to eukaryotic RNA polymerase II
V. ATPase similarity
VI. Similar DNA replication and repair
How many of the above characters Archaebacteria share with eukaryotes?

  1. 3

  2. 4

  3. 5

  4. 6
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Following characteristics of Archaebacteria that they share with eukaryotes:

The cell wall does not contain peptidoglycan, DNA associated with histones, ATPase similarity.
So the correct option is '3.'

Multiple choice bio-chemistry unit of living - cell eukaryotic cell kinds of cell introduction to eukaryotic cell


9 + 2 fibrillar arrangement is present in:

  1. Bacterial flagella

  2. Bacterial fimbriae

  3. Eukaryotic flagella

  4. T4 bacteriophage
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The 9+2 microtubule arrangement (9 outer doublets + 2 central singlet microtubules) is characteristic of eukaryotic flagella and cilia. Bacterial flagella use a different structure (filament + hook + basal body), and fimbriae are protein filaments without this arrangement.

Multiple choice biology animal behaviour ethology coordination in human beings- chemical control endocrine system in humans

Which of the following behaviour is generated due to adrenaline rush?

  1. Instinct

  2. Imitation

  3. Conditioning

  4. Imprinting
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Instinct is a kind of behaviour which does not involve any prior learning and is inherent and automatic. When there is stimulus received, the release of adrenaline occurs which is known as the adrenaline rush. This results in the development of response which is automatic and instant. 

Thus, the correct answer is option A. 

Multiple choice biology animal behaviour ethology coordination in human beings- chemical control endocrine system in humans

Which behaviour completely relies on stimulus?

  1. Instinct

  2. Conditioning

  3. Imitation

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Conditioning is the type of behavioral change which is shown towards the discriminative stimulus. The stimulus is added with some kind of attraction or extra benefits. The stimulus is often associated with a consequence. The strength of the behavior depends on the stimulus and the consequence. The type of behavior will always rely on the stimulus and its strength. When there is the certain attractive image used to describe an advertisement, this is done to attract the people to buy the product. 

Thus, the correct answer is option B. 

Multiple choice biology animal behaviour ethology coordination in human beings- chemical control endocrine system in humans

Conditioning behaviour that uses neutral stimulus is called as

  1. Classical conditioning

  2. Operant conditioning

  3. Neutral conditioning

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Classical conditioning refers to a learning procedure in which a biologically potent stimulus (e.g. food) is paired with a previously neutral stimulus (e.g. a bell).

  •  It's important to note that classical conditioning involves placing a neutral signal before a naturally occurring reflex. In Pavlov's classic experiment with dogs, the neutral signal was the sound of a tone and the naturally occurring reflex was salivating in response to food. By associating the neutral stimulus with the environmental stimulus (presenting of food), the sound of the tone alone could produce the salivation response. 
  • Hence, classical conditioning is the correct answer.

Multiple choice biology animal behaviour ethology coordination in human beings- chemical control endocrine system in humans

Instinct behaviour is 

  1. Autonomic response

  2. Conditioning response

  3. Voluntary response

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Instinct behaviour is the autonomic response to the stimuli (external) or environmental conditions. It develops when a human rationalises several voluntary and involuntary actions according to his/her will. It is the behaviour intrinsic to the person. So, the correct option is 'Autonomic response'. 

Multiple choice biology movement and locomotion in living organisms movements in plants coordination in plants tropic and nastic movements in plants

Phototaxis is shown by

  1. Zoospores of Ulothrix

  2. Chlamydomonas

  3. Volvox

  4. All of above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Phototaxis is a movement of part of organism in response to the light. This phenomenon is exhibited by zoospores of certain algae like Ulothrix, Chlamydomonas, Volvox, Cladophora. They exhibit positive phototaxic movement in presence of diffused light and negative phototaxic movement in presence of intense light.

Thus, the correct answer is option D. 

Multiple choice biology life processes in living organism movements in plants coordination in plants tropic and nastic movements in plants

Locomotion is a very important feature in animals.Considering the frequent need for locomotion in animals ,an animals would obtain the greatest benefit from storing its energy as 

  1. Proteins

  2. minerals

  3. Carbohydrates

  4. Fats
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Fats store more than twice the amount of energy per unit mass compared to carbohydrates and proteins, making them the most lightweight and efficient form of long-term energy storage for mobile animals. Storing energy as glycogen or protein would add excessive weight.

Multiple choice movement in plants living world of plants - plant physiology biology

Movements of tentacles in Drosera are

  1. Photonastic

  2. Thermonastic

  3. Thigmonastic

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Nastic movements are responses of plant parts to stimuli. Photonastic movement is the nastic response of plant in response to light. Thermonastic movement is the a nastic response of plant in response to change in temperature. Seismonastic movement is the nastic response of a plant to touch or vibration. Dropping of leaves of Mimosa pudica upon touching is due to seismonasty. Thigmonastic movement is the nastic response of a plant to touch. The movements of tentacles of Drosera when comes in contact with insect is due to thigmonasty.

Thus, the correct answer is option C.

Multiple choice movement in plants living world of plants - plant physiology biology

Movements of hair in Drosera is 

  1. Photonastic

  2. Thermonastic

  3. Thigmonastic

  4. Seismonastic
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Any nastic movement in response to touch or contact stimulus is known as thigmonasty. The tentacles of Drosera leaves curve on coming with any insects and thus, the movement is categorised as thigmonasty which makes option C correct. Any nastic movements caused in response to sunlight or temperature stimuli are known as photonastic and thermonastic movements respectively. This makes options A and B incorrect. Nastic movements in response to any mechanical shock, such as blow, shaking or pressure, are known as seismonastic movements. This makes option D incorrect. Correct answer is C.

Multiple choice movement in plants living world of plants - plant physiology biology

Bending of tentacles in Drosera is thigmonasty.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Drosera also known as Sundew is one of the largest carnivorous plants. They capture and digest insects which they eat to supplement the poor mineral nutrition that they obtain from the soil in which they grow. They bear glandular tentacles which they use in capturing prey. The tentacles being extremely sensitive bend towards the centre of the leaf so as to bring the insect close to their glands. Since this bending takes place in response to the touch brought about by the insect, it is a type of thigmonasty

Thus, the correct answer is option A. 

Multiple choice movement in plants living world of plants - plant physiology biology

Which locomotory movement is not correct?

  1. Cyclosis and rotation of cytoplasm in Hydrilla

  2. Sucrose induced movement of sperms

  3. Flagellar movement of slime mould

  4. Chlamydomonas moves away from intense light
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Cyclosis is also called as cytoplasmic streaming. It is the directed movement of cytosol and organelles. Rotational cyclosis is seen in Hydrilla. Sperm movement is induced by the change in intracellular ion concentration. Sperm motility is also induced by sucrose. Flagella is a locomotory organ that is seen in slime mould along with fungi, protozoan, etc. Slime mould shows flagellar movement. Chlamydomonas move towards the light.

Thus, the correct answer is option D.