Year-wise Biology practice

RE-NEET 2026 Biology PYQs

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90 questions in this collection · Page 6 of 9

Question 51 of 90
🟢 Re NEET 2026 📘 CLASS XII

Sexual Reproduction In Flowering Plants

How many theca are present in each lobe of a typical bilobed angiosperm anther?
A typical angiosperm anther is bilobed, and each lobe contains two theca (dithecous anther).
Question 52 of 90
🟢 Re NEET 2026 📘 CLASS XII

Locomotion And Movement

Muscle contraction is initiated by a signal sent by the central nervous system by the release of _______.
Acetylcholine is released at the neuromuscular junction and initiates muscle contraction.
Question 53 of 90
🟢 Re NEET 2026 📘 CLASS XII

Biotechnology Principles And Processes

Which of the following statements about lac-operon is correct?
The regulatory gene (i) is constitutively expressed. Allolactose, not galactose, acts as the inducer by inactivating the repressor.
Question 54 of 90
🟢 Re NEET 2026 📘 CLASS XII

Sexual Reproduction In Flowering Plants

Which of the following in the female gametophyte of an angiosperm helps in guiding the pollen tube for fertilizing the egg?
Synergids possess a filiform apparatus that guides the pollen tube towards the egg apparatus.
Question 55 of 90
🟢 Re NEET 2026 📘 CLASS XII

Sexual Reproduction In Flowering Plants

Which of the following plants produces non-albuminous seeds?
Pea produces non-albuminous (exalbuminous) seeds because the endosperm is consumed during embryo development.
Question 56 of 90
🟢 Re NEET 2026 📘 CLASS XII

Sexual Reproduction In Flowering Plants

If the diploid chromosome number of a typical angiosperm is 36, what would be the chromosome number in its endosperm?
The endosperm is triploid (3n). If the diploid chromosome number is 36 (2n), then n = 18 and the endosperm chromosome number is 3n = 54.
Question 57 of 90
🟢 Re NEET 2026 📘 CLASS XII

Excretory Products And Their Elimination

Which of the following statements about the reabsorption process in Henle's loop are correct?

(a) The descending limb of Henle's loop is permeable to water but almost impermeable to electrolytes.
(b) Urine gets concentrated in Henle's loop.
(c) Reabsorption of Na+ and water takes place in Henle's loop.
(d) Active or passive transport of electrolytes occurs in the ascending limb of Henle's loop.

Choose the correct answer from the options given below:
The descending limb reabsorbs water, whereas the ascending limb reabsorbs electrolytes and is impermeable to water. The filtrate becomes concentrated in the descending limb.
Question 58 of 90
🟢 Re NEET 2026 📘 CLASS XII

Locomotion And Movement

Which of the following is the correct order of arrangement of vertebral column from head to toe?
The vertebral column is arranged from top to bottom as cervical, thoracic, lumbar, sacral and coccygeal vertebrae.
Question 59 of 90
🟢 Re NEET 2026 📘 CLASS XII

Evolution

Which of the following is not evidence for evolution?
Haeckel's biogenetic law has been discredited and is no longer accepted as valid evidence for evolution.
Question 60 of 90
🟢 Re NEET 2026 📘 CLASS XII

Evolution

Given below are two statements:

Statement I: Modern Homo sapiens arose in Australia and moved across continents.

Statement II: Homo sapiens arose around 75000 to 10000 years ago.

In the light of the above statements, choose the most appropriate answer from the options given below:
Modern Homo sapiens originated in Africa. NCERT states that Homo sapiens arose in Africa about 2 lakh years ago and later spread to other continents.
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