NCERT Class-9 Science Solutions: Chapter 5-The Fundamental Unit Of Life Part 6

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Question 36:

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?

Answer:

Diffusion and osmosis respectively

Image of Osmosis

Image of Osmosis

Image of Osmosis

Question 37:

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?

Answer:

Exosmosis

Question 38:

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.

  1. Both the cells will swell.

  2. RBC will burst easily while cells of onion peel will resist the bursting to some extent.

  3. A and B both are correct.

  4. RBC and onion peel cells will behave similarly.

Answer:

Onion peel has cell wall and RBC does not have cell wall. 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.

Question 39:

Bacteria do not have chloroplast but some bacteria are photoautotrophic in nature and perform photosynthesis. Which part of bacterial cell performs this?

Answer:

Small vesicles associated with plasma membrane

Question 40:

Match the following A and B.

Match the Following a and B. (Q)
Match the following A and B. (Q)

A

B

Smooth endoplasmic reticulum

Amoeba

Lysosome

Nucleus

Nucleoid

Bacteria

Food vacuoles

Detoxification

Chromatin material and nucleolus

Suicidal bag

Answer:

Match the Following a and B. (A)
Match the following A and B. (A)

A

B

Smooth endoplasmic reticulum

iv Detoxification

Lysosome

v Suicidal bag

Nucleoid

iii Bacteria

Food vacuoles

i Amoeba

Chromatin material and nucleolus

ii Nucleus

Question 41:

Write the name of different plant parts in which chromoplast, chloroplast and leucoplast are present.

Answer:

Flower and Fruit— Chromoplast

Leaves of the plant— Chloroplast

Root of the plant— Leucoplast