Home
Class 11
BIOLOGY
Green algae usually have a rigid cell wa...

Green algae usually have a rigid cell wall made of an inner layer of ____and an outer layer of_____.

A

cellulose,cellulose

B

pectose,pectose

C

pectose,cellulose

D

cellulose,pectose

Text Solution

Verified by Experts

The correct Answer is:
D

Cell wall of green algae is thin, transparent and firm and consists of outer pectic and inner cellulosic layers. It is smooth but in most of species it gets thickened at the anterior end to form an apical popilla.
Promotional Banner

Similar Questions

Explore conceptually related problems

Algae have cell wall made up of

Which of the following made of several layers of cells?

I am the outer most layer of an animal cell. Who am I?

An embryologist interested in studying the morphogenetic movements in chick embryo, during 3 cells layer stage of the embryo, added some vital stains as embryonic fate markers (embryonic fate markers usually stain the cells and in future development of embryo the stained cells differen tiate into developing organ. Thus the movement of the cell can be traced). He gave the upper layer green colour, middle layer orange and innermost layer blue. a. Name the 3 layers mentioned above. b. Based on your knowledge regarding the development of an embryo predict three organs with these respective colours.

Read the given paragraph about human eye carefully and correct the mistakes. Our eye is cylindrical shaped. The wall of the eyeball is composed of five layers.The outermost layer is cornea. The innermost layer is called sclera. The eyeball consists of elastic nerves and biconcave lens.The pupil attaches lens to iris . Iris has rod and cone shaped cells. Aqueous humour is present between lens and retina. The vitreous humour is present between cornea and lens . The brain changes the light into nerve impulses and sends them to retina.

Which cell wall layer of plant cell is laid during maturation? Mention its role.

An electric heater is used in a room of total wall area 137m^(2) to maintain a temperature of 20^(@)C inside it, when the outside temperature is -10^(@)C .The walls have three different layers of materials. The innermost layer is of wood of thickness 2.5cm, the middle layer is of cement of thickness 1.0cm and the outermost layer is of brick of thickness 25.0cm. Find the power of the electric heater. Assume that there is no heat loss through the floor and the celling. The thermal conductivities of wood, cement and brick are 0.125Wm^(-1)C^(-1) , 1.5Wm^(-1)C^(-1) . and 1.0Wm^(-1)C^(-1) respectively.

Consider the following statements. Organization of vascular cambium (i) The cells of vascular cambium do not fit into the usual description (ii) vascular cambium possesses Cells with large central vacuole surounded by a thin, layers of dense cytoplasm (iii) The vascular combium is the presence of three kinds of initials.