• It is made up of tightly packed cells that form a continuous sheet.
• It has no blood vessels, so it relies on diffusion to get nutrients and oxygen.

Collenchyma tissue is a type of tissue that provides support and flexibility to plant organs. Two functions of collenchyma tissue are:

• It helps to keep plant organs from collapsing.
• It allows plant organs to bend without breaking.

Two differences between plant cells and animal cells are:

• Plant cells have a cell wall, while animal cells do not.
• Plant cells have chloroplasts, which allow them to make their own food through photosynthesis. Animal cells do not have chloroplasts.

Examples of prokaryotic and eukaryotic cells:

• Prokaryotic cells: Bacteria are prokaryotic cells.
• Eukaryotic cells: Animal and plant cells are eukaryotic cells.

(d) Chemonasty

(c) Oestrogen

(d) Receptor → Afferent nerve → Nerve centre → Efferent nerve → Effector

(b) Prophase

(b) Uracil base

(a) Haploid gamete formation is essential in sexual reproduction

1. 1 : 2 :1
2. 3 : 1
3. 9 : 3 : 3 : 1
4. 2 : 1 : 2

(b) Hemophilia