Plant Kingdom — BIOLOGY STD 11 Science — Question

Through which organ does respiration takes place in scorpion?

Name the monomers of:

1. Myosin (thick) filament.
2. 'F' actin (thin) filament.

What causes fatigue in voluntary muscles?

Name the phase of nuclear division which is described by each of the following sentences:
(i) Disappearance of nuclear membrane.
(ii) Reappearance of nuclear membrane and nucleus.
(iii) Due to division of centromere and shortening of spindle fibres, chromatids reach towards opposite poles.
(iv) Chromosomes establish themselves on the equatorial plate of spindle and spindle fibres get attached to the centromere.

Name the protein which forms the intercellular ground substance.

Name any two accessory/ additional excretory organs of cockroach.

Name the tissue represented by jute fibres used in making ropes.

OR

Name the dead elements present in phloem.

Name the two sub-phyla referred to as Protochordates.

The animals of Aschelminthes are circular in cross section, hence what are they called?

What is formed by the unicellular elongations of the epidermal cells?