Transportation and Excretion
Which part of the heart carried oxygentated blood to different parts of the body?
Aorta
Give an example of a plant reproduce through stem.
Potato
Differentiate arteries and veins
Arteries: Carry oxygenated blood, thick-walled, valves absent
Veins: Carry deoxygenated blood, thin-walled, valves present
What is layering? give an example.
When a part of plant stem is bent and buried in the soil, which will develp roots over time , then the two plants are separated . Example: Rose.
What is ascent of sap?
Xylem carries water and nutrients from the soil through the root to the leaves. It carries in unidirection al the way. This process is called ascent of sap.
Name the male and female parts in a flower.
Stamen- has anther and filament. The pollen grains which is a male gamete are in the anther.
Pistil - has style, stigma and ovary.
How does urine act as an inidcator to diagnose illness?
Diabetes mellitus- when the urine shows the presence of glucose.
Diabetes insipidus- When the person is frequently urinating.
Kidney damage or tumours: When blood is passed along the urine.
Differentiate self-pollination and cross-polliantion
Self-pollination transfer of pollen grains from the anther to the stigma of the same flower.
Cross-pollination
The transfer of pollen grains from the anther to the stigma of the different flowers of the same kind.
Explain Structure of human excretory system
Kidneys , ureters, urinary bladder and urethra makes a human excretory system.
The blood along with nitrogenous waste passes through the kidney.
Nephrons are the filtering units which excretes urine from the blood .
The urine is passed along the tube like structures called ureters,
The urinary bladder stores the urine, untill it is full.
The urethra excretes the urine through the opening.
Explain the post-ferilisation changes in a flower.
The male and female gamete fuse to form a zygote.
The zygote undergoes repeated cell division to form an embryo.
The ovule develops into a seed.
The ovary develops into a fruit.
The petals will wither off.