General Science/Everyday Science MCQs
Topic Notes: General Science/Everyday Science
MCQs and preparation resources for competitive exams, covering important concepts, past papers, and detailed explanations.
Plato
- Biography: Ancient Greek philosopher (427–347 BCE), student of Socrates and teacher of Aristotle, founder of the Academy in Athens.
- Important Ideas:
- Theory of Forms
- Philosopher-King
- Ideal State
1
Which invertebrate phylum has a 'notochord' (at least in the larval stage)?
Answer:
Chordata
Tunicates (sea squirts) are invertebrate chordates that lose their notochord when they settle and become sessile adults.
2
What is the primary benefit of 'Sexual Reproduction' over 'Asexual Reproduction'?
Answer:
It generates genetic variation, which helps populations adapt to changing environments
While asexual reproduction is efficient, the genetic diversity provided by meiosis and fertilization is a powerful defense against parasites and changing conditions.
3
Which phylum has 'jointed legs' and 'exoskeleton'?
Answer:
Arthropoda
This phylum includes more species than all other phyla combined, largely due to their versatile jointed limbs.
4
What is 'Agnosia' in an animal behavior context? (Actually, let's use 'Allogrooming')
Answer:
Social grooming between members of the same species
Allogrooming reinforces social bonds and establishes hierarchies, as seen in many primate societies.
5
Which class of vertebrates first developed 'lungs'?
Answer:
Lobe-finned fish ancestors
Lungs originally evolved as outpocketings of the esophagus in early fish living in oxygen-poor waters, before being modified into swim bladders in some or used for land-breathing in others.
6
What is 'Imprinting' dependent on?
Answer:
A critical or sensitive period
If the animal does not experience the stimulus during this narrow window of time, the behavior will not develop properly.
7
Which group of animals has a 'gastrovascular cavity' but no anus?
Answer:
Cnidarians and Flatworms
Having an 'incomplete' digestive system means that food and waste must share the same passage, which is less efficient than a 'tube-within-a-tube' design.
8
In behavior, 'Sensory Drive' refers to the evolution of signals that:
Answer:
Are best perceived given the specific physical environment (e.g., forest vs. grassland)
This theory explains why animal signals (like color or sound) are often matched to the lighting or acoustics of their habitat to ensure effective communication.
9
Which phylum is characterized by having 'pedicellariae' (tiny pincer-like structures) on their skin?
Answer:
Echinodermata
Echinoderms use pedicellariae to keep their body surface free of debris and small parasites.
10
What is 'Parthenogenesis'?
Answer:
A form of asexual reproduction where an embryo develops from an unfertilized egg
Parthenogenesis is found in some species of bees, lizards, and even sharks, allowing females to reproduce without a mate.