#biology practice MCQ

PSS- Sec-F-Transport

Velocity of polar auxin transport compared to phloem transport is:

Slower (C) is correct here. This is core PSS- Sec-F-Transport: once you know the definition or pathway step, Slower is the clear fit. The wrong ones are A) Faster; B) Equal; D) Variable. If the topic is about gradients or potentials, water/solutes move from higher to lower of the relevant quantity.

Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.

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WATER TRANSPORT+PYQS

Casparian strip is impregnated mainly with:

Answer: C) Suberin and lignin. For WATER TRANSPORT, remember the key idea and you’ll land on this option; the distractors usually swap cause and effect or confuse similar terms. Avoid: A) Cellulose; B) Pectin; D) Hemicellulose. Name the process first, then pick the option that describes it — don’t reverse cause and effect.

Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.

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WATER TRANSPORT+PYQS

Symplastic pathway involves movement through:

The right choice is C: Plasmodesmata. In WATER TRANSPORT, that matches how the process or concept actually works — the other choices mix up related ideas or use the wrong mechanism. Skip these: A) Cell walls; B) Intercellular spaces; D) Xylem. A quick check: if an option needs energy, pumps, or the opposite direction of movement, ask whether that really applies.

Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.

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WATER POTENTIAL+PYQS

Solute potential (Ψs) is always:

The right choice is C: Negative. In WATER POTENTIAL, that matches how the process or concept actually works — the other choices mix up related ideas or use the wrong mechanism. Skip these: A) Positive; B) Zero; D) Equal to Ψp. A quick check: if an option needs energy, pumps, or the opposite direction of movement, ask whether that really applies.

Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.

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WATER POTENTIAL+PYQS

Concept of water potential was proposed by:

Go with B — Slatyer and Taylor. Under WATER POTENTIAL, this is the standard explanation you’d use in class: it names the real driver or definition, while the rest are nearby but wrong. Not these: A) Van’t Hoff; C) Meyer; D) Fick. When two options sound similar, choose the one that matches the textbook definition most tightly.

Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.

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BASICS of PLANT+PYQS

Tonicity of a solution refers to its ability to:

Go with B — Modify cell volume. Under BASICS of PLANT, this is the standard explanation you’d use in class: it names the real driver or definition, while the rest are nearby but wrong. Not these: A) Change temperature; C) Break cell wall; D) Alter metabolism. When two options sound similar, choose the one that matches the textbook definition most tightly.

Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.

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BASICS of PLANT+PYQS

Osmosis is best defined as movement of:

Answer: B) Water across semipermeable membrane. For BASICS of PLANT, remember the key idea and you’ll land on this option; the distractors usually swap cause and effect or confuse similar terms. Avoid: A) Solute across membrane; C) Ions across membrane; D) Gases across membrane. Name the process first, then pick the option that describes it — don’t reverse cause and effect.

Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.

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Thermoregulation

Warm-blooded animals are also known as:

Correct option is C, Endotherms. In Thermoregulation, the accurate description is Endotherms, and that is what you should commit to memory. Keep the definition tight and the role clear — Endotherms is the option that correctly names the structure, process, or principle asked for in Thermoregulation. Then Endotherms 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 Endotherms. 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.

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Reproductive System

Leydig cells secrete:

Correct option is C, Testosterone. In Reproductive System, the accurate description is Testosterone, and that is what you should commit to memory. Keep the definition tight and the role clear — Testosterone is the option that correctly names the structure, process, or principle asked for in Reproductive System. Then Testosterone 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 Testosterone. 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.

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Reproductive System

Scrotal temperature is regulated mainly by:

Answer: B) Cremaster and dartos muscles. For Reproductive System, once you lock onto the key mechanism or definition, Cremaster and dartos muscles is the clear fit. If you restate the concept in your own words, the functional job described in the stem is exactly what Cremaster and dartos muscles does in Reproductive System. So Cremaster and dartos muscles is the clean, accurate selection. If a similar stem appears later, start from the same core fact and you will land on the same kind of answer. In class notes, highlight this same phrase next to the related diagram so the wording and the picture reinforce each other.

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.

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Excretory System

Ammonotelic animals excrete nitrogenous waste mainly as:

Answer: C) Ammonia. For Excretory System, once you lock onto the key mechanism or definition, Ammonia is the clear fit. If you restate the concept in your own words, the functional job described in the stem is exactly what Ammonia does in Excretory System. So Ammonia is the clean, accurate selection. If a similar stem appears later, start from the same core fact and you will land on the same kind of answer. In class notes, highlight this same phrase next to the related diagram so the wording and the picture reinforce each other. When you practise, cover the choices first, write Ammonia from memory, then reveal the letter — that habit builds real recall for Excretory System.

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.

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Digestive System

Which part of pharynx functions only in respiration?

Correct option is C, Nasopharynx. In Digestive System, the accurate description is Nasopharynx, and that is what you should commit to memory. Keep the definition tight and the role clear — the functional job described in the stem is exactly what Nasopharynx does in Digestive System. Then Nasopharynx 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 Nasopharynx. 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.

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