NEET SECTION - A [BOTANY - MCQ]

C

(A) Brassica
Bicarpellary, Syncarpous ovary is seen in Brassica.

(D) Degenerate, Non-overlapping, Non ambiguous
the correct combination of salient features of Genetic Code

(C) rRNAs - 28 S, 18 S and 5.8 S
In the process of transcription in Eukaryotes, the RNA polymerase I transcribes -

B

(C) Hershey and Chase
Hershey and Chase – scientist experimentally proved that DNA is the sole genetic material in bacteriophage

(C) Klinefelter's Syndrome
Klinefelter's Syndrome – each cell in the affected person, has three sex chromosomes XXY

(B) AIDS and Hepatitis B
AIDS and Hepatitis B – sexually transmitted diseases do not specifically affect reproductive organs

C

(D) Both FSH and LH levels are low in the luteal phase
No new follicles develop in the luteal phase of the menstrual cycle b ecause
(D) Both FSH and LH levels are low in the luteal phase

(A) Endemic
Endemic – Western Ghats have a large number of plant and animal species that are not found anywhere else.

B

(B) Biopiracy
Exploitation of bioresources of a nation by multinational companies without authorization from the concerned country is referred to as Biopiracy

(A) Ampicillin and Tetracycline
The two antibiotic resistance genes on vector pBR 322 are for (A) Ampicillin and Tetracycline

(B) Papaya
Papaya – both autogamy and geitonogamy are prevented

(C) has natural killer cells which can phagocytose and destroy microbes
Humans have acquired immune system that produces antibodies to neutralize pathogens. Still innate immune system is present at the time of birth because it

A

(A) Pollination occurs in submerged condition by water.
The type of pollination takes place in Vallisneria

C

(B) Monosporic with three sequential mitotic divisions
The most common type of embryo sac in angiosperms

(B) passive transport requires a concentration gradient across a biological membrane whereas active transport requires energy to move solutes.
The main difference between active and passive transport across cell membrane is :
(2) passive transport requires a concentration gradient across a biological membrane whereas active transport requires energy to move solutes.

(B) Double stranded circular naked DNA
Double stranded circular naked DNA – nucleic acids is present in an organism having 70 S ribosomes only

(C) Alstonia
Alstonia – shows whorled phyllotaxy

(D) Annelids
Annelids are true coelomates with bilateral symmetry

(C) Aquatic arthropods - Gills
(A) Flatworms – General body surface
(B) Sponges – General body surface
(C) Aquatic arthropods – Gills
(D) Coelenterates – General body surface

B

B

(A) Myasthenia gravis
Myasthenia gravis diseases is an auto-immune disorder

(B) Abnormally folded protein
Mad cow disease in cattle is caused by an agent which has Abnormally folded protein

D

D

(B) Vital Capacity
The maximum volume of air a person can breathe in after a forced expiration is known as Vital Capacity

(C) Gibberellins
In order to increase the yield of sugarcane crop, Gibberellins plant growth regulators should be sprayed

(C) Inner mitochondrial membrane
the respiratory electron transport system (ETS) located in Inner mitochondrial membrane of cell in plants

(D) Blue and red light
One scientist cultured Cladophora in a suspension of Azotobacter and illuminated the culture by splitting light through a prism. He observed that bacteria accumulated mainly in the region of Blue and red light

(B) twice the amount of DNA in comparison to haploid gametes
After meiosis I, the resultant daughter cells have
(2) twice the amount of DNA in comparison to haploid gametes

(B) Non-sister chromatids of homologous chromosomes at Pachytene stage of prophase I.
Crossing over takes place between Non-sister chromatids of homologous chromosomes at Pachytene stage of prophase I of the cell cycle

(B) they (prosthetic groups) are tightly bound to apoenzymes.
prosthetic groups are tightly bound to apoenzymes while coenzyme is loosely bound

(A) Both Statement I and Statement II are incorrect
Statement I:
During the chemical reaction no changed in enzyme molecule.
Statement II :
In some enzymes A non protein constituents called cofactors are bound to the enzyme to make the
enzyme catalytically active.

(B) Phospholipid
Phospholipid – organic compounds is the main constituent of Lecithin

(C) rRNA
Non-membranous nucleoplasmic structures in nucleus are the site for active synthesis of Rrna