Year-wise Biology practice

NEET 2023 Biology PYQs

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100 questions in this collection · Page 9 of 10

Question 81 of 100
🟢 NEET 2023 📘 CLASS XII

Biotechnology Principles And Processes

Which of the following is not a cloning vector?
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Question 82 of 100
🟢 NEET 2023 📘 CLASS XII

Biotechnology And Its Applications

Which one of the following techniques does not serve the purpose of early diagnosis of a disease for its early treatment?
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Question 83 of 100
🟢 NEET 2023 📘 CLASS XII

Organisms And Populations

Match List-I with List-II.
List-I (Interacting species) List-II (Name of Interaction)
(A)A Leopard and a Lion in a forest/ grassland (I)Competition
(B)A Cuckoo laying egg in a Crow's nest (II)Brood parasitism
(C)Fungi and root of a higher plant in Mycorrtizae (III)Mutualism
(D)A cattle egret and a Cattle in a field (IV)Commensalism
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Question 84 of 100
🟢 NEET 2023 📘 CLASS XII

Environmental Issues

Which of the following statements is correct?
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Question 85 of 100
🟢 NEET 2023 📘 CLASS XII

Environmental Issues

Given below are two statements:
Statement I: Electrostatic precipitator is most widely used in thermal power plant.
Statement II: Electrostatic precipitator in thermal power plant removes ionising radiations
In the light of the above statements, choose the most appropriate answer from the options given below:
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Question 86 of 100
🟢 NEET 2023 📘 CLASS XI

Animal Kingdom

The unique mammalian characteristics are:

AI-generated explanation. Check against your textbook.

Explanation:

The unique mammalian characteristics listed by NCERT include the presence of hairs, pinna (external ears), and mammary glands. These features are characteristic of mammals and help in identification. Among the options, only option 3 mentions hairs, pinna and mammary glands, making it the correct choice.

🧠 Did You Know?

Monotremes (egg-laying mammals) also have these features, but the combination of hairs, pinna, and mammary glands is broadly used to define mammals in NCERT texts.

💡 NCERT Memory Line:

Hairs, pinna and mammary glands are characteristic features of mammals.

Question 87 of 100
🟢 NEET 2023 📘 CLASS XI

Animal Kingdom

Select the correct statements with reference to chordates.
A. Presence of a mid-dorsal, solid and double nerve cord.
B. Presence of closed circulatory system.
C. Presence of paired pharyngeal gills
D. Presence of dorsal heart
E. Triploblastic pseudocoelomate animals.
Choose the correct answer from the options given below:

AI-generated explanation. Check against your textbook.

Explanation:

Correct statements: B and C. Chordates have a closed circulatory system (blood confined to vessels). They possess pharyngeal gill slits (often paired) at some life stage. A is incorrect because the nerve cord in chordates is a dorsal hollow nerve cord, not a solid or double one. D is incorrect since the heart is typically ventral in chordates. E is incorrect because chordates are triploblastic and coelomate, not pseudocoelomate. Thus, B and C only are correct.

🧠 Did You Know?

NCERT emphasizes the five distinguishing features: notochord, dorsal hollow nerve cord, pharyngeal slits, post-anal tail, and segmented body plan with a closed circulatory system in chordates.

💡 NCERT Memory Line:

Chordates: triploblastic coelomates with a dorsal hollow nerve cord and closed circulatory system, plus pharyngeal gill slits in at least some life stage.

Question 88 of 100
🟢 NEET 2023 📘 CLASS XI

Structural Organisation In Animals

Which of the following is characteristic feature of cockroach regarding sexual dimorphism?
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Question 89 of 100
🟢 NEET 2023 📘 CLASS XI

Structural Organisation In Animals

Match List-I with List-II.
List-I List-II
(A)Mast cells (I)Ciliated epithelium
(B)Inner surface of bronchiole (II)Areolar connective tissue
(C)Blood (III)Cuboidal epithelium
(D)Tubular parts of nephron (IV)specialised connective tissue
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Question 90 of 100
🟢 NEET 2023 📘 CLASS XI

Structural Organisation In Animals

In cockroach, excretion is brought about by:
A.Phallic gland
B.Urecose gland
C.Ncphrocytes
D.Fat body
E.Collatcrial glands
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