The rod-shaped structures in nucleus, which are visible at the time of cell division, are known as chromosomes.

Nucleolus is a non-membrane-bound structure that is composed of proteins and nucleic acids. It is the largest structure in the nucleus of eukaryotic cells, where it primarily serves as the site of ribosome synthesis and assembly.

Apical meristems - These are situated at the growing tip of stems and roots. Lateral meristems - These are found beneath the bark and in vascular bundles of dicot roots and stems. Intercalary meristems - These are located at the base of leaves and internodes.

The plant tissues become woody by the process of lignification.

Sclerenchymatous tissue is present in the husk of coconut, which comprises of dead cells with thickened cell walls due to deposition of lignin and hemicellulose. This makes husk of coconut hard and stiff. That is why it is difficult to remove.

Endoplasmic reticulum helps in the transportation of material being synthesised and provides surface for some biochemical activities. It detoxifies poisons and drugs. However, the waste material of a cell is stored in vacuoles and lysosomes.

Both the statements are correct about cell wall. Cell wall is made of a complex carbohydrate called cellulose. It is hard and rigid.

White blood cells are amoeboid in shape as they can change their shape.

Cell walls permit the cells of plants, fungi and bacteria to withstand very dilute (hypotonic) external media without bursting. In such media, the cells tend to take up water by osmosis.

The cyton or "cell body" is the bulbous end of a neuron, containing the cell nucleus.  

The “waterproof” stratified squamous epithelium is present in the skin.

All are correctly matched.   Chloroplast : Involvement in photosynthesis Chromoplast : Imparting attractive colours to flowers and fruits Leucoplast : Storage of starch, oil and proteins

Haversian canals are a series of microscopic tubes in the outermost region of the bone called cortical bone that allow blood vessels and nerves to travel through them. Each haversian canal generally contains one or two capillaries and nerve fibres.

Mitochondrion has two membrane coverings. The outer membrane is very porous, while the inner membrane is deeply folded. These folds create a large surface area for ATP-generating chemical reactions.

The dark spot-like structure that helps in making ribosomes is called nucleolus and it is present in the nucleus.