13 public questions tagged with this topic.
DNA ligase does not act as a restriction enzyme; instead, it joins DNA fragments by sealing nicks in the sugar-phosphate backbone.
Ref: NCERT Class 12 Biology Chapter 9: Biotechnology: Principles and Processes Principles of Biotechnology - Genetic Engineering
Matthias Schleiden examined many plants and concluded that they are composed of different kinds of cells that form plant tissues. He and Theodore Schwann later formulated the cell theory.
Ref: NCERT Class 11 Biology Chapter 8: Cell: The Unit of Life Cell Theory and Overview of Cell
Chromoplasts contain fat-soluble carotenoid pigments such as carotene and xanthophylls. These pigments may give plant parts a yellow, orange or red colour.
Ref: NCERT Class 11 Biology Chapter 8: Cell: The Unit of Life Cell Theory and Overview of Cell
Some mature cells lack a nucleus. Examples include erythrocytes of many mammals and sieve-tube cells of vascular plants.
Ref: NCERT Class 11 Biology Chapter 8: Cell: The Unit of Life Cell Theory and Overview of Cell
The endoplasmic reticulum divides the intracellular space into a luminal compartment within the ER and an extra-luminal compartment represented by the cytoplasm.
Ref: NCERT Class 11 Biology Chapter 8: Cell: The Unit of Life Cell Theory and Overview of Cell
Vacuoles may occupy up to 90 per cent of the volume of a plant cell. A vacuole is a membrane-bound cytoplasmic space enclosed by the tonoplast.
Ref: NCERT Class 11 Biology Chapter 8: Cell: The Unit of Life Cell Theory and Overview of Cell
The membrane of a human erythrocyte contains approximately 52 per cent protein and 40 per cent lipid. The protein-to-lipid ratio varies considerably among different cell types.
Ref: NCERT Class 11 Biology Chapter 8: Cell: The Unit of Life Cell Theory and Overview of Cell
Frogs use gills only during the larval stage. Adult frogs rely on lungs, skin (cutaneous respiration), and buccal respiration.
Ref: NCERT Class 11 Biology Chapter 7: Structural Organisation in Animals Frog - Anatomy - Digestive and Respiratory System
Correct option is C, External environment. In Thermoregulation, the accurate description is External environment, and that is what you should commit to memory. Keep the definition tight and the role clear — External environment is the option that correctly names the structure, process, or principle asked for in Thermoregulation. Then External environment is the answer you can defend. Check yourself by covering the options and writing the answer first, then matching the letter — that builds confidence. If the wording feels dense, translate it into everyday language first, then map that plain sentence back onto External environment. Remember that physiology questions reward precise language: name the process, the location, and the outcome, then match that to the option text.
Ref: Animal physiology is Unit 7 of the CSIR NET Life Science Syllabus, covering core body systems. It accounts for roughly 10% of the total marks in Sections B and C.
Atrophies during development (C) is the right choice. This sits at the heart of Endocrinology: the wording points straight to what is happening in the tissue or organ system. A useful study habit is to ask what the structure or process is for: Atrophies during development is the option that correctly names the structure, process, or principle asked for in Endocrinology. That reasoning supports Atrophies during development. One solid sentence about why this works is enough for recall — you do not need a long essay for every MCQ. When you practise, cover the choices first, write Atrophies during development from memory, then reveal the letter — that habit builds real recall for Endocrinology.
Ref: Animal physiology is Unit 7 of the CSIR NET Life Science Syllabus, covering core body systems. It accounts for roughly 10% of the total marks in Sections B and C.
Pick B: Phosphodiesterase. Thinking about Endocrinology in a practical way — what the structure does, or what the process achieves — leads you here. Clinically and academically, the same logic shows up again and again: Phosphodiesterase is the option that correctly names the structure, process, or principle asked for in Endocrinology. Hence Phosphodiesterase is correct. Treat this as a building block for the rest of Endocrinology; neighbouring topics often reuse the same principle. Keep a one-line summary card for this idea and revisit it before the paper; short, repeated review beats long cramming sessions. If the wording feels dense, translate it into everyday language first, then map that plain sentence back onto Phosphodiesterase.
Ref: Animal physiology is Unit 7 of the CSIR NET Life Science Syllabus, covering core body systems. It accounts for roughly 10% of the total marks in Sections B and C.
Pick C: Retina. Thinking about Peripheral Nervous System in a practical way — what the structure does, or what the process achieves — leads you here. Clinically and academically, the same logic shows up again and again: Retina is the option that correctly names the structure, process, or principle asked for in Peripheral Nervous System. Hence Retina is correct. Treat this as a building block for the rest of Peripheral Nervous System; neighbouring topics often reuse the same principle. Keep a one-line summary card for this idea and revisit it before the paper; short, repeated review beats long cramming sessions. If the wording feels dense, translate it into everyday language first, then map that plain sentence back onto Retina.
Ref: Animal physiology is Unit 7 of the CSIR NET Life Science Syllabus, covering core body systems. It accounts for roughly 10% of the total marks in Sections B and C.
