The exact homework question text from the image. If multiple questions, state the main one. Under 200 characters.

Here are the solutions to the biology questions:

1. The point of attachment of the leaf to the stem is the:
The point on a stem where a leaf is attached is called a node.

• B. Node

2. The contractile vacuole in Amoeba helps in:
The contractile vacuole in Amoeba is crucial for expelling excess water from the cell, a process known as osmoregulation.

• D. Osmoregulation

3. Choose the correct order of events in the Nitrogen Cycle:
The nitrogen cycle begins with atmospheric nitrogen being fixed by bacteria, then assimilated by plants, which are consumed by animals, and finally, animals die and decompose, returning nitrogen to the soil.

• D. Nitrogen in the air $\to$ Bacteria fix Nitrogen $\to$ Animals get Nitrogen from plants $\to$ Animals die and decompose

4. A solution obtained from crushed germinating bean seeds was tested with Millon's reagent and a red colour was observed. This indicates the presence of:
Millon's reagent is used to detect proteins, and a red color indicates a positive result.

• A. Proteins

5. Which part of the alimentary canal produces bile?
Bile is produced by the liver, which then sends it to the gall bladder for storage before it is released into the duodenum.

• B. Liver

6. Which layer of the skin produces melanin?
The Malpighian layer (also known as the basal layer) contains melanocytes, which are cells responsible for producing the pigment melanin.

• B. Malpighian layer

7. What structure protects the lizard's body from mechanical injury?
Lizards have scales covering their bodies, which provide a protective barrier against physical damage and environmental factors.

• A. Scales

8. The diagram below is that of a plant cell. Which of the numbered structures contain chlorophyll?
Chlorophyll, the pigment essential for photosynthesis, is found within the chloroplasts. In the diagram, structure 4 points to a chloroplast.

• D. 4

9. The part of the eye responsible for image formation is the:
The retina is the light-sensitive layer at the back of the eye where light is converted into neural signals, forming the image.

• C. Retina