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#biology practice questions

14 public questions tagged with this topic.

Which developmental phase is shortened by vernalization?

Answer: B) Adult vegetative phase. For VERNALIZATION & FLOWERING, remember the key idea and you’ll land on this option; the distractors usually swap cause and effect or confuse similar terms. Avoid: A) Juvenile phase; C) Reproductive phase; D) Embryonic phase. 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.

Plants requiring vernalization but not given cold treatment generally show:

Answer: C) Delayed flowering or remain vegetative. For VERNALIZATION & FLOWERING, remember the key idea and you’ll land on this option; the distractors usually swap cause and effect or confuse similar terms. Avoid: A) Early flowering; B) Normal flowering; D) Seed abortion. 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.

Primary site of cold perception during vernalization is:

That points to C: Shoot apical meristem. Compared with the other options, Shoot apical meristem is the one that correctly describes the VERNALIZATION & FLOWERING concept. The wrong ones are A) Leaves; B) Roots; D) Flowers. If you’re stuck, eliminate anything that contradicts a basic fact you already know for this topic.

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

At cellular level, the most dominant mode of transport for small molecules is:

That points to B: Diffusion. Compared with the other options, Diffusion is the one that correctly describes the BASICS of PLANT concept. The wrong ones are A) Active transport; C) Mass flow; D) Endocytosis. If you’re stuck, eliminate anything that contradicts a basic fact you already know for this topic.

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

Diffusion in plant cells refers to movement of molecules from high to low concentration due to:

The right choice is C: Their own kinetic energy. In BASICS of PLANT, that matches how the process or concept actually works — the other choices mix up related ideas or use the wrong mechanism. Skip these: A) ATP-driven pumps; B) Carrier proteins; D) Bulk flow. 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.

Humans are classified as endotherms because they:

Generate internal body heat (B) is the right choice. This sits at the heart of Thermoregulation: 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: cause and effect line up with Generate internal body heat — that is the mechanism or reason the stem is pointing to. That reasoning supports Generate internal body heat. 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 Generate internal body heat from memory, then reveal the letter — that habit builds real recall for Thermoregulation.

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.

Hormone responsible for maintenance of pregnancy in early stages is:

Progesterone (A) is the right choice. This sits at the heart of Reproductive System: 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: Progesterone is the option that correctly names the structure, process, or principle asked for in Reproductive System. That reasoning supports Progesterone. 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 Progesterone from memory, then reveal the letter — that habit builds real recall for Reproductive 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.

Primary oocytes are arrested in which stage?

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

Intrinsic factor secreted by stomach is essential for absorption of:

Answer: C) Set point. For Digestive System, once you lock onto the key mechanism or definition, Set point is the clear fit. If you restate the concept in your own words, Set point is the option that correctly names the structure, process, or principle asked for in Digestive System. So Set point 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.

The esophagus primarily functions in:

Go with D — Transport of food. Within Digestive System, that statement lines up with the standard definition and the usual exam wording you’ll see. In plain terms, the functional job described in the stem is exactly what Transport of food does in Digestive System. Holding that picture in mind makes Transport of food feel natural rather than something you only memorise. Link the term to a real body example (organ, tissue, or ion flow) so the idea stays concrete under exam pressure. A short mental diagram helps — start from stimulus or structure, follow the pathway, and stop at the functional result described by Transport of food.

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.