2.Why it is that onion leaf epidermal cell do not contain chloroplast?

Question

1. State the similarities and differences between animal cells and plant cells.
2. Why the nucleus is called the “control centre” of the cell?
3. What is tissue? What word means collection of tissues doing one particular job?
4. Name the type of cells which lines the inner cheek
5.when cells were discovered and by whom.

Answer 1

first: onions are underground, and are root-like, and do not need to perform photosynthesis to produce organic compounds for food for the rest of the plant. The onion bulb stores the organic product made by the onion plant's leaves which are above surface.
1. animal cells and plant cells have many of the same organelles, some including cell membrane, nucleus (generally), cytoplasm, and they're both eukaryotic cells. some differences include that no animal cells have chloroplasts and animal cells don't do photosynthesis....there are a lot of similarities and differences...found in a bio textbook.
2. nucleus has DNA and controls the functions of the cell, ie response to external stimuli and cell replication
3. tissue means collection of cells performing the same operation, eg. tissue in stomach secretes digestive enzymes, or tissue in epidermis acts to protect internal organs and contents of body from infection etc.
4. epithelial
5. Robert Hooke. He saw cork cells under the microscope.

Answer 2

Onions are the root of the plant and do not perform photosynthesis. The shoots above ground do contain chloroplasts.

1. Animal and plant cells share many of the same organelles and carry on life processes such as cellular respiration.

2. The nucleus regulates the cell's activities.

3. Tissues are groups of like cells working together. Groups of tissues form organs.

4. Epithelial cells line the inner cheek.
5. Cells were discovered around 1665 by Robert Hooke. He was looking at a piece of cork and named them cells because of their room-like appearance.

Answer 3

Stainless steel can remove the scent of onion or garlic, if you have a metal sink, try rubbing your hands against the side