TNPSC - Group 4 Important Questions with Answers for Science

1. Maximum power of division is found in the skin layer ____

(A) Stratum granulosum 

(B) Stratum malpighi 

(C) Stratum spinosum 

(D) Stratum corneum

Answer:  B

2. Tube feet are characteristic of ____

(A) Star fish 

(B) Cuttle fish 

(C) Cray fish 

(D) Jelly fish 

Answer: A

3. The parts of neurons that perform basic cellular functions, such as protein synthesis, are the ____ 

(A) Somas 

(B) Axons

(C) Dendrites 

(D) Synaptic knobs

Answer: A

4. Lewy bodies are found in ____

(A) Brain 

(B) Plasma 

(C) Lymph 

(D) Kidneys 

Answer: A

5. A hormone that stimulates the secretion of pancreatic secretions to neutralize the acid chyme from the stomach, is ____

(A) Insulin 

(B) Secretin 

(C) Oxytocin 

(D) Glucagon 

Answer: B

6. Which of the following pair is correctly matched ? 

(A) Excessive perspiration—Xeric adaptation 

(B) Parasitism—Interspecific relationship 

(C) Uricotelism—Aquatic habitat 

(D) Streamline body—Aquatic adaptation

Answer: D

7. Enzymes promote chemical reaction by ___

(A) Reducing the activation energies 

(B) Causing the release of heat which acts as a primer

(C) Increasing molecular motion 

(D) Changing the free energy difference between substrate and product 

Answer: A

8. The modification of hind pair of wings into haltered is the characteristic of ___ 

(A) Lepidoptera 

(B) Orthoptera 

(C) Hemiptera 

(D) Diptera 

Answer: D

9. A molecule of ATP is structurally similar to a molecule of ____

(A) RNA molecule 

(B) DNA molecule 

(C) Amino acid 

(D) Fatty acid 

Answer: A

10. Class Trematoda belongs to the phylum ____

(A) Platyhelminthes 

(B) Arthropoda 

(C) Mollusca 

(D) Annelida 

Answer: A

11. Albinism is caused due to lack of production of ____

(A) Tyrosine 3-monooxygenase 

(B) Homogentisic acid oxidase

 (C) Thiamine pyrophosphate 

(D) Phenylalanine hydroxylase 

Answer: A

12. Which of the following is egg laying mammal ? 

(A) Pangolin 

(B) Porcupine 

(C) Tachyglossus 

(D) Bat 

Answer: C

13. Acetylcholine is responsible for transmission of nerve impulses through ____ 

(A) Dendrites 

(B) Axons 

(C) Cytons 

(D) Synapses

Answer:  D

14. Loss of ability to speak due to defect of vocal organs, is called ____ 

(A) Alalia 

(B) Alaorina 

(C) Alate 

(D) Albidus 

Answer: A

15. Heparin is secreted by ___

(A) Fibroblasts 

(B) Mast cells 

(C) Plasmocytes 

(D) Adipocytes 

Answer: B

16. Interdependent genes with related functions, form ___

(A) A coadapted gene complex 

(B) An inversion 

(C) A fitness set 

(D) A super mutation 

Answer: A

17. Which of the following animal has rhabditiform larva in its life cycle ? 

(A) Ascaris 

(B) Liverfluke

(C) Hydra 

(D) Taenia 

Answer: A

18. Which of the following Mollusc is cultured in water for producing pearls in India ? 

(A) Pinctada 

(B) Heliotis 

(C) Anodonta 

(D) Mytilus 

Answer: A

19. ‘A tube within a tube’ body plan is met within ____ 

(A) Hydra

(B) Plannaria 

(C) Ascaris 

(D) Fasciola 

Answer: C

20. Termination of amino acid chain requires codons ____ 

(A) UAG, UAA, UGA 

(B) UUU, GGU, UGG 

(C) GUG, UGG, AUG 

(D) UGG, GGG, AUG 

Answer: A