Answer:
30
Explanation:
The seed of an angiosperm is formed as a result of fertilization (fusion of sperm in pollens and the ova from ovary). According to the question, the cells of the seed which will grow into the plant contains 20 chromosomes. Seeds of angiosperms contain a tissue called ENDOSPERM that forms as a result of the unique DOUBLE FERTILIZATION in angiosperms. It occurs when one haploid sperm cell fuses with two haploid polar nuclei to form a triploid endospermic structure that serves as food for the growing embryo in the seed.
Now based on the above explanation, the diploid plant cell with 20 chromosomes will have 10 chromosomes (half as much) in its gametes as a result of meiosis. This 10 chromosomes in each gamete (sperm and ovum) fuses to form a diploid zygote with 20 chromosomes, while one haploid sperm cell (10 chromosomes) also fuses with two haploid polar nuclei (10 chromosomes each) to form a triploid endosperm with 30 chromosomes i.e. 10+10+10.
Force required = F = ?
mass of the car = m = 1200 kg
initial velocity of the car = Vi = 10 m/sec
final velocity of the car = 0
time required to stop the car = t = 20 sec
Using Newton`s 2nd law of motion;
F = ma ………………………(1)
as a = Vf - Vi / t , put this value in equation (1)
F = m ( Vf - Vi /t ) ………………(2)
F = 1200 ( 0 - 10 /20) = - 600 N
here Negative sign shows that external force is acting in opposite direction of the motion to bring it to rest.
we can also calculate this force by using the relation
Rate of change of momentum = net force acting on the object …………(3)
m Vf - m Vi / t = net force acting on the object
m (Vf - Vi / t) = F
1200 ( 0 - 10 /20) = - 600 N = F
so, net force acting on the object =F = - 600 N
I have the same question right now and the correct answer is photosynthesis
As light intensity increases, the rate of photosynthesis increases, whereas a decrease in light intensity decreases the rate of photosynthesis, because light is a necessary factor for photosynthesis
Starch is a polymer composed of glucose units as monomers. Hydrolysis reaction can break down large molecules into smaller ones.
- Hydrolysis is a type of chemical reaction in which a water (H2O) molecule is used to break down large molecules into smaller ones.
- Starch is a complex polysaccharide composed of more than six (6) glucose molecules linked by alpha-glycosidic bonds.
- Glycosidic bonds can be hydrolyzed by specific enzymes known as glycosidases.
- A starch molecule composed of 300 glucose molecules contains 299 alpha-glycosidic bonds.
- In consequence, in this case, 299 water (H2O) molecules are required to completely hydrolyze the amylose starch polymer into glucose monomers.
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