Biology MCQS

651. Sapwood is formed from_____________?
A: Primary xylem
(B) Secondary xylem
C: Primary phloem
D: Secondary phloem

652. Conversion of ammonia or ammonium ion into nitrites during the nitrogen cycle occurs due_____________?
A: Rhizobium
(B) Nitrosomonas
C: Nitrobacter
D: Pseudomonas

653. Cellulose is the major component of__________?
(A) Primary wall
B: Secondary wall
C: Middle lamella
D: All of the above

654. Hummingbird is an example of________________?
A: Cold-blooded animal
B: Ectotherm
C: Endotherm
(D) Heterotherm

655. Number of cervical vertebrae is_____________?
(B) 7
A: 5
C: 9
D: 12

656. Autophagosomes are____________?
(D) Both a and b
A: Those lysosomes which eat parts of their own cells to generate energy.
B: Those lysosomes which eat old and worn-out cellular organelles.
C: Lysosomes which help in extracellular digestion

657. Rubisco content of the chloroplast is?
(A) 12%
(B) 19%
(C) 20%
(D) 16%

658. Which of the following is the example of Gram-negative bacteria?
(A) Lactobacillus
(B) Escherichia Coli
C: Staphylococcus aureus
D: Bacillus subtilis

659. Female sex organs of bryophytes are called?
(A) Archegonium
B: Antheridium
C: Corpogonium
D: Ascogonium

660. Splitting of an atom is also called?
(A) Moderating
B: Merging
C: Fusion
(D) Fission