Regarding cross-linked or network polymers, which of the following statements is incorrect?
a.
They contain covalent bonds between various linear polymer chains.
b.
Examples are bakelite and melamine.
c.
They are formed from bi- and tri-functional monomers.
d.
They contain strong covalent bonds in their polymer chains.
Correct Answer
Step-by-Step AI Explanation
Verified Method
Statement (4) is incorrect because while cross-linked polymers have covalent bonds between chains, the statement 'they contain strong covalent bonds in their polymer chains' is vague and less characteristic than the primary definition of cross-linked networks being 3D structures. Often, this question targets the distinction that cross-linking usually refers to covalent bridges between chains, not just the chains themselves.
Q85mcq
Which oxide of nitrogen is not a common pollutant introduced into the atmosphere both due to natural and human activity?
a.
N2O5
Correct Answer
b.
N2O
c.
NO2
d.
NO
Step-by-Step AI Explanation
Verified Method
N2O5 is highly reactive and not a common primary pollutant in the troposphere compared to NO, NO2, and N2O.
Q91mcq
Which of the following statements is correct?
a.
Ovules are not enclosed by ovary wall in gymnosperms.
Correct Answer
b.
Horsetails are gymnosperms.
c.
Selaginella is heterosporous, while Salvinia is homosporous.
d.
Stems are usually unbranched in both Cycas and Cedrus.
Step-by-Step AI Explanation
Verified Method
Gymnosperms are characterized by naked seeds as they lack an ovary wall.
Q92mcq
Pneumatophores occur in
a.
Halophytes
Correct Answer
b.
Carnivorous plants
c.
Free-floating hydrophytes
d.
Submerged hydrophytes
Step-by-Step AI Explanation
Verified Method
Pneumatophores are specialized roots found in plants like Rhizophora (mangroves) growing in swampy/saline areas to assist in respiration.
Q93mcq
Sweet potato is a modified
a.
Stem
b.
Tap root
c.
Adventitious root
Correct Answer
d.
Rhizome
Step-by-Step AI Explanation
Verified Method
Sweet potato (Ipomoea batatas) is a modified tuberous adventitious root.
Q94mcq
Plants having little or no secondary growth are
a.
Grasses
Correct Answer
b.
Conifers
c.
Deciduous angiosperms
d.
Cycads
Step-by-Step AI Explanation
Verified Method
Secondary growth is characteristic of dicots and gymnosperms; monocots like grasses typically show little or no secondary growth.
Q95mcq
Casparian strips occur in
a.
Epidermis
b.
Cortex
c.
Pericycle
d.
Endodermis
Correct Answer
Step-by-Step AI Explanation
Verified Method
Casparian strips are composed of suberin and are found in the endodermis of roots.
Q96mcq
Secondary xylem and phloem in dicot stem are produced by
a.
Apical meristems
b.
Phellogen
c.
Vascular cambium
Correct Answer
d.
Axillary meristems
Step-by-Step AI Explanation
Verified Method
The vascular cambium is responsible for secondary growth in dicot stems, producing secondary xylem and secondary phloem.
Q97mcq
Select the wrong statement :
a.
Cell wall is present in members of Fungi and Plantae.
b.
Pseudopodia are locomotory and feeding structures in Sporozoans.
Correct Answer
c.
Mushrooms belong to Basidiomycetes.
d.
Mitochondria are the powerhouse of the cell in all kingdoms except Monera.
Step-by-Step AI Explanation
Verified Method
Sporozoans are non-motile; pseudopodia are found in Sarcodina (Amoeboid protozoans).
Q98mcq
The experimental proof for semiconservative replication of DNA was first shown in a
a.
Fungus
b.
Plant
c.
Bacterium
Correct Answer
d.
Virus
Step-by-Step AI Explanation
Verified Method
Meselson and Stahl first demonstrated semiconservative DNA replication using E. coli (a bacterium).
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Which one of the following plants shows a very close relationship with a species of moth, where none of the two can complete its life cycle without the other?
a.
Hydrilla
b.
Banana
c.
Yucca
d.
Viola
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Which of the following characteristics represent ‘Inheritance of blood groups’ in humans? a. Dominance b. Co-dominance c. Multiple allele d. Incomplete dominance e. Polygenic inheritance
a.
b, c and e
b.
b, d and e
c.
a, b and c
d.
a, c and e
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Match the items given in Column I with those in Column II and select the correct option given below:
Column I: a. Eutrophication, b. Sanitary landfill, c. Snow blindness, d. Jhum cultivation
Column II: i. UV-B radiation, ii. Deforestation, iii. Nutrient enrichment, iv. Waste disposal
a.
(1) ii i iii iv
b.
(2) iii iv i ii
c.
(3) i iii iv ii
d.
(4) i ii iv iii
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Match the items given in Column I with those in Column II:
Column I: a. Tricuspid valve, b. Bicuspid valve, c. Semilunar valve
Column II: i. Between left atrium and left ventricle, ii. Between right ventricle and pulmonary artery, iii. Between right atrium and right ventricle
a.
(1) iii i ii
b.
(2) i ii iii
c.
(3) i iii ii
d.
(4) ii i iii
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Match the items given in Column I with those in Column II:
Column I: a. Tidal volume, b. Inspiratory Reserve volume, c. Expiratory Reserve volume, d. Residual volume
Column II: i. 2500–3000 mL, ii. 1100–1200 mL, iii. 500–550 mL, iv. 1000–1100 mL
a.
(1) iii ii i iv
b.
(2) i iv ii iii
c.
(3) iii i iv ii
d.
(4) iv iii ii i
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Match the items given in Column I with those in Column II and select the correct option given below:
Column I | Column II
a. Tidal volume | i. 2500 – 3000 mL
b. Inspiratory Reserve volume | ii. 1100 – 1200 mL
c. Expiratory Reserve volume | iii. 500 – 550 mL
d. Residual volume | iv. 1000 – 1100 mL
a.
(1) iii ii i iv
b.
(2) i iv ii iii
c.
(3) iii i iv ii
d.
(4) iv iii ii i
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Match the items given in Column I with those in Column II:
Column I: a. Glycosuria, b. Gout, c. Renal calculi, d. Glomerular nephritis
Column II: i. Accumulation of uric acid in joints, ii. Mass of crystallised salts within the kidney, iii. Inflammation in glomeruli, iv. Presence of glucose in urine
a.
(1) iii ii iv i
b.
(2) ii iii i iv
c.
(3) i ii iii iv
d.
(4) iv i ii iii
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Match the items given in Column I with those in Column II and select the correct option given below:
Column I | Column II
a. Glycosuria | i. Accumulation of uric acid in joints
b. Gout | ii. Mass of crystallised salts within the kidney
c. Renal calculi | iii. Inflammation in glomeruli
d. Glomerular nephritis | iv. Presence of glucose in urine
a.
(1) iii ii iv i
b.
(2) ii iii i iv
c.
(3) i ii iii iv
d.
(4) iv i ii iii
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Match the items given in Column I with those in Column II and select the correct option given below:
Column I (Function) | Column II (Part of Excretory System)
a. Ultrafiltration | i. Henle’s loop
b. Concentration of urine | ii. Ureter
c. Transport of urine | iii. Urinary bladder
d. Storage of urine | iv. Malpighian corpuscle
a.
(1) iv v ii iii
b.
(2) v iv i ii
c.
(3) iv i ii iii
d.
(4) v iv i iii
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Match the items given in Column I with those in Column II and select the correct option given below:
Column I | Column II
a. Proliferative Phase | i. Breakdown of endometrial lining
b. Secretory Phase | ii. Follicular Phase
c. Menstruation | iii. Luteal Phase
a.
(1) iii ii i
b.
(2) ii iii i
c.
(3) i iii ii
d.
(4) iii i ii
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Match the items given in Column I with those in Column II and select the correct option given below:
Column I | Column II
a. Fibrinogen | i. Osmotic balance
b. Globulin | ii. Blood clotting
c. Albumin | iii. Defence mechanism
a.
(1) iii ii i
b.
(2) i iii ii
c.
(3) i ii iii
d.
(4) ii iii i
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Match the items given in Column I with those in Column II and select the correct option given below:
Column I: a. Fibrinogen, b. Globulin, c. Albumin
Column II: i. Osmotic balance, ii. Blood clotting, iii. Defence mechanism
a.
a-iii, b-ii, c-i
b.
a-i, b-iii, c-ii
c.
a-i, b-ii, c-iii
d.
a-ii, b-iii, c-i
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