Download App

Cell The Unit of Life — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYCell The Unit of Life5 Marks
Question
Structure and function are correlatable in living organisms. Can you justify this by taking plasma membrane as an example?
✓

Answer

This is true that structure and function are correlated in living organisms. Following aspects of structure and function of plasma membrane justify this fact.
  • Plasma membrane provides a boundary to the cell contents. This is made possible because of its ability to segregate the inside of the cell with the external environment.
  • Plasma membrane is a semi-permeable membrane. This attribute helps the plasma membrane to allow exchange of some selected materials between the cell and its external environment.
  • We know that plasma membrane is composed of a lipid bilayer which has proteinintersperse in a mosaic like pattern. The protein molecules serve as channels for those substances which need active transport mechanism to enter or exit a cell.
  • The fluid layer of lipid allows those molecules to pass through the membrane which can easily travel through osmosis.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "5 Marks Questions" from Cell The Unit of Life→Cell The Unit of Life — all question types→BIOLOGY STD 11 Science question papers→Rajasthan Board STD 11 Science question papers→Rajasthan Board question paper generator→

Similar questions

Fill up the blank spaces appropriately:
Phylum/ Class
Excretory Organ
Circulatory Organ
Respiratory Organ
Arthropoda
-
-
Lungs/ Gills/ Tracheal System
-
Nephridia
Closed
Skin/parapodia
-
Metanephridia
Open
-
Amphibia
-
Closed
Lung
→
What is cell cycle?
→
Make a labelled diagram of air alveoli. Explain the mechanism of respiration.
→
What is a centromere? How does the position of centromere form the basis of classification of chromosomes. Support your answer with a diagram showing the position of centromere on different types of chromosomes.
→
Mention the ploidy of the following: protonemal cell of a moss; primary endosperm nucleus in dicot, leaf cell of a moss; prothallus cell of a fern; gemma cell in Marchantia; meristem cell of monocot, ovum of a liverwort, and zygote of a fern.
→
What is called respiratory organ? Describe the following structures for exchange of gases in animals:
(i) General body surface, (ii) Trachea, (iii) Gills.
→
Describe the different levels of organisation of body of animals, with an example for each.
→
Explain the structure of human respiratory system with the help of suitable diagram.
→
How is a key helpful in the identification and classification of an organism?
→
How various PGRs were discovered? Describe.
→