BIOLOGY [3 marks Question Answer]

(i) neuron
(ii) 1. dendrite, 2nucleus, 3 axon,. 4.nerve ending
(iii) carry impulse

(i) phloem tissue
(ii) 1.plasmodesma, 2. companian, 3. cell sieve tube 4.sieve plate
(iii) conduct food

SMOOTH MUSCLES : These muscle fibers are smooth in nature because they do not have any striations. They do contain any dark and light bands occurring repeatedly.
SKELETAL MUSCLE : These muscles have stripes in it. Unlike smooth muscles, in this skeletal muscle there occurs alternating dark and light bands occurring repeatedly.
CARDIAC MUSCLE : These muscle fibers are branched. Cardiac muscle fiber has a very distinct characteristics from the two other muscle fibers that is they have intercalated disc present in them.
So, by observing all these character on the slides through microscope, we can distinguish which slide contains what type of muscle fibers.

Characteristics of Permanent tissue:
• Cells of these tissues have no power of division.
• Cells are well developed and properly shaped.
• Cell wall is comparatively thick.
• Nucleus of the cells are bigger and cytoplasm is dense.
• Usually there are vacuoles in the cell.
• There may have intercellular spaces in between cells
The permanent tissue in plants mainly helps in providing support, protection as well as in photosynthesis and conduction of water, minerals, and nutrients. Permanent tissue cells may be living or dead

The characteristics of meristematic tissue are as follows:
• Cells are small and usually cubical.
• Cell walls are thin and Nuclei are large.
• Vacuoles are almost absent.
• Cells tightly packed with almost intercellular spaces.
• The new cell produced is transformed into mature permanent tissues.
Its main function is to begin growth of new cells in young seedlings at the tips of roots and shoots

Striated muscles are the cylindrical, non-branched, multinucleated muscles with alternative light and dark bands while non-striated muscles are long, non-branched, uninucleated muscles without alternative light and dark bands

Bones are the hard, inelastic and a tough organ that forms part of the vertebral skeleton. Cartilage is a soft, elastic and flexible connective tissue that protects the bone from rubbing against each other

Lymph consists of only white blood cells, proteins, salts, glucose, fats, and water whereas blood consists of RBC's, WBC's and platelets and other substances such as glucose, amino acids etc.

Voluntary muscle is striated muscle
smooth muscle
Peristalsis Is the Contraction of Muscle Tissue That Helps Move and Break Down Foodstuffs