Question

9. Why is endocytosis found in animals only?
10. A person takes a concentrated solution of salt, after sometime, he starts vomiting. What is the
phenomenon responsible for such a situation? Explain.
11. Name any cell organelle which is non membranous.
12. We eat food composed of all the nutrients like carbohydrates, proteins, fats, vitamins, minerals and
water. After digestion, these are absorbed in the form of glucose, amino acids, fatty acids, glycerol etc.
What mechanisms are involved in absorption of digested food and water?
13. If you are provided with some vegetables to cook. You generally add salt into the vegetables during
cooking process. After adding salt, vegetables release water. What mechanism is responsible for this?
14. If cells of onion peel and RBC are separately kept in hypotonic solution, what among the following will
take place? Explain the reason for your answer.
15. (a) Both the cells will swell.
(b) RBC will burst easily while cells of onion peel will resist the bursting to some extent.
(c) a and b both are correct.
(d) RBC and onion peel cells will behave similarly.
16. Bacteria do not have chloroplast but some bacteria are photoautorophic in nature and perfor
photosynthesis. Which part of bacterial cell performs this?​

Answer 1

Answer:

Explanation:

9.Endocytosis refers to imagination of a small region of plasma membrane, forming an inter cellular membrane-bound vesicle. ... Endocytosis is not shown by plant cells because a rigid cell wall is present over the plasma membrane in them. Thus, this process is found in animals only.

10. When a solution containing excess of salt is taken, then due to osmosis water will move into the intestine, putting pressure on the intestinal walls. This also causes nausea. The intestinal wall is not able to tolerate this strain, and hence this excess water retention causes vomiting.

11.Ribosomes

12.Diffusion is a process in which the molecules intermingle due to their kinetic energy and movement of molecules is from higher concentration to lower concentration. Osmosis is a process in which the water molecules move from lower solute concentration to higher solute concentration through a semi-permeable membrane. Digested food can pass into the blood vessels in the wall of the small intestine through the process of diffusion and water present in the ingested food is absorbed by the process of osmosis.

13.Exosmosis is the process of movement of water molecules from the inner portions of the cell outside, where the solution is hypertonic due to the presence of salt and thus by adding salt to the vegetables it releases water.

The same principle is used in pickling, where the mangoes (or any other fruit) are soaked in a hypertonic solution of salt.

Then the mangoes will ooze out water and the cell becomes flaccid. This process is called as an exosmosis.

14. When kept in hypotonic solution the RBCs burst easily because they are animal cells and do not possess cell wall, while the RBC burst when kept in onion peel possess cell wall which makes it resistant to the bursting due to swelling caused by endosmosis.

15.  When kept in hypotonic solution the RBCs burst easily because they are animal cells and do not possess cell wall, while the RBC burst when kept in onion peel possess cell wall which makes it resistant to the bursting due to swelling caused by endosmosis.

16. Bacterial cell do not have chloroplast but yet some photoautotrophic bacteria perform photosynthesis due to the presence of chlorophyll in cooperated in the membrane. Embedded in the cell membrane are reaction centers which specifically absorb light energy.