Natural Resources — Science STD 9 — Question

Collenchyma mainly forms __________.

Simple epithelium is a tissue in which cells are:

1. Hardened and provide support to organs.
2. Continuously dividing to provide to form an organ.
3. Cemented directly to one another to form a single layer.
4. Loosely connected to one another to form an irregular layer.

Schwann and Schleiden were:

To which height is ozonosphere present over the equator:

1. 11–16km
2. 23–25km
3. 16–20km
4. 10–12km

Which of the following tissues has dead cells?

While preparing a slide for observing onion peel under a microscope, the onion peel is immediately kept in a watch-glass containing a drop of water. Why this is done?

Living organisms vary widely in size. However, even the largest organisms such as the giant redwood and the blue whale have cells that are roughly the same size as those in smaller organisms. Why are all cells small?

In intercropping, there is maximum utilization of the supplied nutrients because:

Animal cell lacking nuclei would also lack in:

1. Chromosome.
2. Ribosome.
3. Lysosome.
4. Endoplasmic reticulum.

Epithelial tissue always has an exposed outer surface and an inner surface anchored to connective tissue by a thin, non-cellular structure called the: