Biology Botany Online Mock Test CBSE NEET UG,AIIMS,JIPMER

NEET UG Botany MCQ-20

Question No:1

Genetic material of TMV is

(A) ss- DNA
(B) ds-DNA
(C) ss-RNA
(D) ds-RNA

Question No:2

Which of these are viral diseases

(A) influenza, mumps and measles
(B) smallpox and chickenpox
(C) polio and hydrophobia
(D) all of the above

Question No:3

Virus multiplies in

(A) living tissue
(B) soil
(C) culture medium
(D) dead tissue

Question No:4

The literal meaning of virus is

(A) Venom
(B) Poison
(C) Secretion
(D) all of these

Question No:5

A virus can be considered as living entity because it

(A) Reproduces (inside the host)
(B) Can cause disease
(C) Response to touch stimulus
(D) shows metabolism

Question No:6

(A):Plasmids are small extra chromosomal rings of DNA present in monerans

(R): Plasmids are called transfer plasmids.

(A) Both ( A ) and (R) are true and (R) is the correct explanation of ( A )
(B) Both (A) and (R) are true and (R) is not the correct explanation of (A)
(C) (A) is true but (R) is false.
(D) Both (A) are (R) wrong.

Question No:7

(A): Biological nitrogen fixation is shown by monerans only.

(R):In monera, all membrane -bound cell organelles are absent.

(A) Both ( A ) and (R) are true and (R) is the correct explanation of ( A )
(B) Both (A) and (R) are true and (R) is not the correct explanation of (A)
(C) (A) is true but (R) is false.
(D) Both (A) are (R) wrong.

Question No:8

(A):Monerans are most primitive organisms

(R): Monerans include only bacteria.

(A) Both ( A ) and (R) are true and (R) is the correct explanation of ( A )
(B) Both (A) and (R) are true and (R) is not the correct explanation of (A)
(C) (A) is true but (R) is false.
(D) Both (A) are (R) wrong.

Question No:9

(A):Photoautotrophic bacteria live comfortably near the bottom of ponds and lakes

(R): Photoautotrophic bacteria do not require oxygen.

(A) Both ( A ) and (R) are true and (R) is the correct explanation of ( A )
(B) Both (A) and (R) are true and (R) is not the correct explanation of (A)
(C) (A) is true but (R) is false.
(D) Both (A) are (R) wrong.

Question No:10

(A): Antibiotics are substances produced by micro-organisms.

(R): Majority of antibiotics are produced by bacteria.

(A) Both ( A ) and (R) are true and (R) is the correct explanation of ( A )
(B) Both (A) and (R) are true and (R) is not the correct explanation of (A)
(C) (A) is true but (R) is false.
(D) Both (A) are (R) wrong.

Question No:11

(A): Several cyanobacteria have the ability of nitrogen fixation.

(R):They possess heterocyst with dinitrogenase enzymes

(A) Both ( A ) and (R) are true and (R) is the correct explanation of ( A )
(B) Both (A) and (R) are true and (R) is not the correct explanation of (A)
(C) (A) is true but (R) is false.
(D) Both (A) are (R) wrong.

Question No:12

(A)Bacteria contain linear and single stranded DNA

(R) Bacterial DNA shows more guanine-cytosine content than adenine -thymine content.

(A) Both ( A ) and (R) are true and (R) is the correct explanation of ( A )
(B) Both (A) and (R) are true and (R) is not the correct explanation of (A)
(C) (A) is true but (R) is false.
(D) Both (A) are (R) wrong.

Question No:13

(A)Bacterial cell walls are made of peptidoglycan.

(R)Bacterial cell walls are same as cell walls of plants and fungi.

(A) Both ( A ) and (R) are true and (R) is the correct explanation of ( A )
(B) Both (A) and (R) are true and (R) is not the correct explanation of (A)
(C) (A) is true but (R) is false.
(D) Both (A) are (R) wrong.

Question No:14

(A) Photosynthesis in bacteria is oxygenic

(R) Water is used as a source of reducing power in bacteria.

(A) Both ( A ) and (R) are true and (R) is the correct explanation of ( A )
(B) Both (A) and (R) are true and (R) is not the correct explanation of (A)
(C) (A) is true but (R) is false.
(D) Both (A) are (R) wrong.

Question No:15

(A) Yeasts are a group of nonmycelial or pseudomycelial ascomycetes.

(R) Yeasts in which ascus formation is known are named as true yeasts.

(A) Both ( A ) and (R) are true and (R) is the correct explanation of ( A )
(B) Both (A) and (R) are true and (R) is not the correct explanation of (A)
(C) (A) is true but (R) is false.
(D) Both (A) are (R) wrong.

Question No:16

(A) In Deuteromycetes sexual stages are either absent or not known.

(R) These are called as fungi imperfecti

(A) Both ( A ) and (R) are true and (R) is the correct explanation of ( A )
(B) Both (A) and (R) are true and (R) is not the correct explanation of (A)
(C) (A) is true but (R) is false.
(D) Both (A) are (R) wrong

Question No:17

(A)Lichens are formed by association of a fungus and an alga.

(R)Among both the partners of lichen, fungus alone contributes to reproduction

(A) Both ( A ) and (R) are true and (R) is the correct explanation of ( A )
(B) Both (A) and (R) are true and (R) is not the correct explanation of (A)
(C) (A) is true but (R) is false.
(D) Both (A) are (R) wrong.

Question No:18

(A)Mycorrhiza are useful for the plants mainly due to fixing of atmospheric nitrogen.

(R)Mycorrhiza exhibits the phenomenon of antagonism.

(A) Both ( A ) and (R) are true and (R) is the correct explanation of ( A )
(B) Both (A) and (R) are true and (R) is not the correct explanation of (A)
(C) (A) is true but (R) is false.
(D) Both (A) are (R) wrong.

Question No:19

(A) Phytophthora infestans infects only leaf part of plants.

(R)Phytophthora infestans is the causal organisms of Bengal famine of 1942-

(A) Both ( A ) and (R) are true and (R) is the correct explanation of ( A )
(B) Both (A) and (R) are true and (R) is not the correct explanation of (A)
(C) (A) is true but (R) is false.
(D) Both (A) are (R) wrong.

Question No:20

(A) In the sexual reproduction of primitive fungi, plasmogamy is followed by karyogamy and meiosis. In higher forms of fungi, the karyogamy is delayed.

(R)Candida is an example of false yeast. Rhizopus is commonly known as dung mould.

(A) Both ( A ) and (R) are true and (R) is the correct explanation of ( A )
(B) Both (A) and (R) are true and (R) is not the correct explanation of (A)
(C) (A) is true but (R) is false.
(D) Both (A) are (R) wrong.