Biology Mcqs

Why skeletal muscles are called striated muscles?

A. They appear darker than smooth muscles by naked eye.
B. Alternating dark and light bands appear on their surface when visualized by naked eye.
C. Alternating dark and light bands appear on their surface when visualized via a microscope.
D. All of these

Roots of a plant show______________?

A. Positive phototropism and negative geotropism
B. Negative phototropism and positive geotropism
C. Negative tactic movement and positive tropic movement
D. Positive geotropism of stem and roots

The contraction of which of the following muscle fibers, is controlled by hormones?

A. A smooth muscle
B. A cardiac muscle
C. A skeletal muscle.
D. All of these

Rapid movement of leaves of mimosa on touching is an example of _____________?

A. Turgor movement
B. Nastic movement
C. Tropic movements.
D. Growth movement

Which of the following is a uni-nucleated cell?

A. A smooth muscle cell.
B. A cardiac muscle cell.
C. A skeletal muscle cell.
D. All of these

The place of attachment of leaf with the shoot is called__________?A. Pith.
B. Pit.
C. Petiole
D. Ecdysone

 

Bony callus formation completes in___________?

A. 2-3 weeks
B. 3-4 weeks.
C. 2-3 months.
D. 3-4 months.

Which of the following cells are involved in soft callus formation?

A. Fibroblast and osteoblast.
B. Osteoblast and osteoclast.
C. Osteoclast and osteocyte
D. Onteocyte and osteoblast

Sperms of liverworts, mosses, ferns move towards archegonia, in response to uncleic acid released by the ovum. This is an example of ____________?

A. Chemotropic movement
B. Chemotactic movement
C. Chemosastic movement
D. Haptonastic movement

A fracture hematoma has____________?

A. Healing properties.
B. Destructive properties.
C. Neutralizing properties.
D. Dead cells