Explore topic-wise MCQs in UPSC IAS Exam.

This section includes 274 Mcqs, each offering curated multiple-choice questions to sharpen your UPSC IAS Exam knowledge and support exam preparation. Choose a topic below to get started.

251.

Cloves, used as a spice, are derived from which of the following plant parts? [CDS]

A. Seeds
B. Fruits
C. Flower buds
D. Young leaves
Answer» D. Young leaves
Discussion
252.

Alternate type of phyllotaxy is found in

A. china rose
B. mustard
C. sunflower
D. all of these
Answer» E.
Discussion
253.

Root hairs develop from

A. region of maturation
B. region of elongation
C. region of meristematic activity
D. root cap
Answer» B. region of elongation
Discussion
254.

Roots develop from parts of the plant other than radicle are called

A. tap roots
B. fibrous roots
C. adventitious roots
D. nodular roots
Answer» D. nodular roots
Discussion
255.

A tissue is a group of cells which are

A. similar in origin, but dissimilar in form and function.
B. dissimilar in origin, form and function.
C. dissimilar in origin, but similar in form and function.
D. similar in origin, form and function.
Answer» E.
Discussion
256.

The chief function of vessels in the plant body is

A. to translocate food material
B. to conduct water and mineral salts
C. to support living cells
D. all above
Answer» C. to support living cells
Discussion
257.

Find the true statement:

A. Meristematic cells are not compactly arranged.
B. Collenchyma is not a simple tissue.
C. the term histology was coined by Meyer
D. None of these
Answer» D. None of these
Discussion
258.

The process of formation of blood corpuscles is called

A. haemopoiesis
B. heamolysis
C. heamozoin
D. None of these
Answer» B. heamolysis
Discussion
259.

Meristematic tissues are found in

A. only stems of the plants
B. both roots and stems
C. in all growing tips of the plant body
D. only roots of the plants
Answer» D. only roots of the plants
Discussion
260.

Which of the following statement is incorrect regarding PCR?

A. In PCR, two primers are used.
B. Taq DNA polymerase is related for PCR.
C. Taq DNA polymerase is not thermostable.
D. Multiple copies of gene can be synthesized in PCR.
Answer» D. Multiple copies of gene can be synthesized in PCR.
Discussion
261.

The enzyme used for joining two DNA fragments is called

A. ligase
B. restriction endonuclease
C. DNA polymerase
D. gyrase
Answer» B. restriction endonuclease
Discussion
262.

Which of the following is known as specific molecular scissors?

A. Ligase
B. Helicase
C. Restriction endonuclease
D. DNA polymerase
Answer» D. DNA polymerase
Discussion
263.

Which of the following are associated with Diabetes mellitus, a common disease in adults? [IAS Prelim] 1. Higher sugar level in blood 2. Lower sugar level in blood 3. Lower insulin level in blood 4. Higher insulin level in blood Select the correct answer by using the codes given below: Codes:

A. 2 and 4
B. 1 and 2
C. 2 and 3
D. 1 and 3
Answer» E.
Discussion
264.

"Athlete's Foot" is a disease' caused by [IAS Prelim]

A. Bacteria
B. Fungus
C. Protozoan
D. Nematode
Answer» C. Protozoan
Discussion
265.

According to the World Health Organisation (WHO), the disease which causes the death of the largest number of people today is [IAS Prelim]

A. AIDS
B. Tuberculosis
C. Malaria
D. Ebola
Answer» C. Malaria
Discussion
266.

Select the statement which does not occur during the process of photosynthesis. A. Absorption of light energy by chlorophyll. B. Conversion of chemical energy to light energy and splitting of water molecules into hydrogen and oxygen. C. Oxidation of carbon dioxide to carbohydrates.

A. A and B
B. A and C
C. B and C
D. All of the above
Answer» D. All of the above
Discussion
267.

'Black death' is related with

A. plague
B. cancer
C. tuberculosis
D. measles
Answer» B. cancer
Discussion
268.

Column-I (Drug/Cure)Column-II (Diseases)A.StreptomycinP.Viral DiseaseB.ChloroquineQ.Diabetes MellitusC.PenicillinR.Disease caused by BacteriaD.insulinS.Malaria

A. A-R; B-S; C-P; D-Q
B. A-R; B-S; C-Q; D-P
C. A-R; B-Q; C-P; D-S
D. A-P; B-Q; C-R; D-S
Answer» B. A-R; B-S; C-Q; D-P
Discussion
269.

Autotrophic nutrition occurs in

A. fungi
B. plants
C. some protists and prokaryotes
D. Both [b] and [c]
Answer» E.
Discussion
270.

Column-IColumn-IIA.Small poxP.BacteriaB.CholeraQ.VirusC.MalariaR.Deficiency of mineralsD.AnaemiaS.Female mosquito

A. A-S; B-Q; C-R; D-P
B. A-Q; B-P; C-S; D-R
C. A-S; B-R; C-Q; D-P
D. A-R; B-S; C-P; D-Q
Answer» C. A-S; B-R; C-Q; D-P
Discussion
271.

Select the correct statement.

A. Heterotrophs do not synthesise their own food.
B. Heterotrophs utilise solar energy for photosynthesis.
C. Heterotrophs synthesise their own food.
D. Heterotrophs are capable of converting carbon dioxide and water into carbohydrates.
Answer» B. Heterotrophs utilise solar energy for photosynthesis.
Discussion
272.

Which of the following statements is not correct about macro- nutrients?

A. They are present in plant tissues in excess of 100 m mole per kg of dry matter.
B. They include C, H, O, N, P, S, K, Ca, Mg.
C. Some elements attained from \[C{{O}_{2}}\] and \[{{H}_{2}}O\] while the others are absorbed from the soil.
D. C, H & O are mainly obtained from \[C{{O}_{2}}\] and \[{{H}_{2}}O\].
Answer» B. They include C, H, O, N, P, S, K, Ca, Mg.
Discussion
273.

Nitrogen fixation is a process of

A. converting nitrogen in the air to form a usable form by plants.
B. recycling nitrogen from organic matter in the soil.
C. absorbing nitrogen from the soil.
D. conversion of \[N{{O}_{3}}\] to \[{{N}_{2}}\].
Answer» B. recycling nitrogen from organic matter in the soil.
Discussion
274.

Which of the following elements are constituents of protein?

A. Nitrogen and phosphorus
B. Nitrogen and chlorine
C. Phosphorus and boron
D. Chlorine and potassium
Answer» B. Nitrogen and chlorine
Discussion