Explanation

Accord  اتفاق

Concurrence  اتفاق

Explanation

Intermediate filaments have a diameter of about 10 nm,

Which is intermediate between the diameters of the two other principal elements of the cytoskeleton:

1. actin filaments (about 7 nm) 
2. microtubules (about 25 nm).

Additional informational:

The intermediate filaments are not directly involved in cell movements.

They appear to play a structural role by providing mechanical strength to cells and tissues.

Explanation

intercalary meristems are found at the bases of young leaves and internodes.

They are mainly responsible for further lengthening of stems and leaves.

Additional informational:

Meristematic cells are also responsible for keeping the plant growing.

The Shoot Apical Meristem (SAM):

• SAM gives rise to organs like the leaves and flowers

The Root Apical Meristem (RAM):

• RAM provides the meristematic cells for future root growth.
  

Explanation

The stop codons are :

1. UAA
2. UAG
3. UGA

A stop codon is a sequence of three nucleotides (a trinucleotide) in DNA or messenger RNA (mRNA)

That signals a halt to protein synthesis in the cell.

There are 64 different trinucleotide codons:

• 61 specify amino acids 
• 3 are stop codons
  

Explanation

Color blindness is inherited as a recessive trait on the X chromosome.

This is known in genetics as X-linked recessive inheritance.

Males have only one X chromosome and are hemizygous for X-linked traits.

Additional informational:

Colorblindness is an X-linked chromosome (criss-cross inheritance)

The man has XY chromosomes (1 X chromosome)

and female having XX chromosome (2 X chromosome). 

Explanation

If the male is colorblind but the mother is normal then there is a 50% chance to reproduce the colorblind disease progeny and 50% other.

Colorblindness is an X-linked chromosome (criss-cross inheritance)

The man has XY chromosomes (1 X chromosome)

and female having XX chromosome (2 X chromosome). 

Explanation

Devonian Period is spanning between about 419.2 million and 358.9 million years ago 

It was In geologic time, an interval of the Paleozoic Era

It is sometimes called the “Age of Fishes”

Plants, invertebrates, and other vertebrate lifeforms also experienced major changes in the Devonian

Additional informational:

The name of the Devonian Period is derived from the county of Devon, Eng.

During most of the Devonian Period, North America, Greenland, and Europe were united into a single Northern Hemisphere landmass

Explanation

Leaves with iron chlorosis will develop a yellow color with a network of dark green veins

iron chlorosis is a yellowing of plant leaves caused by iron deficiency,

It causes usually in high-pH soils (pH above 7.0)

Additional informational:

Iron is an essential nutrient for plants.

It functions to accept and donate electrons

They play important roles in the electron-transport chains of photosynthesis and respiration.

Explanation

The epidermis covers the stem, root, leaf, flower, fruit, and seed parts of a plant.

It is the outermost, protoderm-derived layer of cells 

Additional informational:

Its waxy cuticle provides a protective barrier against mechanical injury, water loss, and infection.

It regulates the gas exchange in plant cells.

They regulate the secretion of metabolic substances.

Explanation

The sporophyte of Riccia is the simplest among bryophytes.

It consists of only a capsule, missing both foot and seta

It does not perform photosynthesis.

Additional informational:

Riccia belongs to the class Liver Worts.

They have dorsoventrally flattened lobed plant bodies with unicellular rhizoids.

The mature sporophyte of Riccia is a globular capsule, embedded within the gametophytic plant and is without foot and seta