Weather data of a week
Rainfall
Min.
temp. (c) humidity (96)
Max.
humidity(96)
temp. (c)
3-08-06
27.5
Rainfall may not be recorded for all the days since it may not rain everyday. Leave
e space for rainfall blank if the data is not available.)
ainfall is measured by an
Oreo strument called the rain gauge. It
me basically a measuring cylinder with
funnel on top to collect rainwater.
d. Do all the seven days have the same
minimum temperatures.
weather is too humid", or "the weather
was warm last week".
The weather is such a complex
phenomenon that it can vary over very
short periods of time. It can happen
sometimes that it is sunny in the
hidden clouds appear
Answers
will you observe?
Answer:
If the filament of Spirogyra are broken into fragments, then each fragment will develop into a new plant.
Question 3.
Boojho had the following parts of a rose plant-a leaf, roots, a branch, a flower, a bud and pollen grains. Which of them can be used to grow a new rose plant?
Answer:
Branch can be used to grow a new rose plant. As, rose reproduces by vegetative propagation, i.e. stem cutting method.
Question 4.
In which part of flower does fertilisation occur?
Answer:Question 2.
If the filament of Spirogyra is broken into fragments. What will you observe?
Answer:
If the filament of Spirogyra are broken into fragments, then each fragment will develop into a new plant.
Question 3.
Boojho had the following parts of a rose plant-a leaf, roots, a branch, a flower, a bud and pollen grains. Which of them can be used to grow a new rose plant?
Answer:
Branch can be used to grow a new rose plant. As, rose reproduces by vegetative propagation, i.e. stem cutting method.
Question 4.
In which part of flower does fertilisation occur?
Answer:
Ovary is the part where male and female gametes fuse together.
Question 5.
Name two plants in which pollination occurs by water.
Answer:
Vallisneria and Hydrilla.
Question 6.
Banana is a fruit without seeds. Give reason.
Answer:
Banana forms from one parent only. There is no seed production.
Question 7.
What is meant by the term fertilisation? List the stepwise manner leading to formation of an embryo.
Answer:
The process in which the male gamete fuses with female gamete to form a new cell (called zygote) is called fertilisation.
*When the pollens are deposited on the stigma of the pistil, it begins to germinate. *After sometime, a long pollen tube is developed from the pollen grain which passes through the style towards the female gametes in the ovary.
*The male gametes move down the pollen tube and the tube enters the ovule present inside the ovary.
*The tip of pollen tube bursts and the male gamete comes out of the pollen tube. *Inside the ovary, the male gametes fuse with the female gametes present in the ovule to form a fertilised egg cell which is called zygote.
*The zygote develops into an embryo which is a part of a seed that develops into a