1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Tom [10]
3 years ago
7

Do you think that all pollen germinates indiscriminately on all stigmas?

Biology
1 answer:
r-ruslan [8.4K]3 years ago
4 0
Pollen tube growth is one of the most fascinating—and essential—phenomena in the life cycle of flowering plants. After a compatible interaction between pollen grains and the stigma surface, the pollen germinates and forms the pollen tube, which grows through the stigma, style, and transmitting tract to deliver the sperm cells to the ovule." 
2) Although pollens of many species germinate in simple aqueous media, stigmas do not provide satisfactory sites for the germination of most foreign pollen... Stigmas not only provide the proper conditions for the germination of pollen from their particular species, they actively inhibit the germination of pollen of many unrelated species.
You might be interested in
Roller coasters, with their twists, turns, and loops, seem to defy everything we know about how objects move. Roller coaster des
Contact [7]

Answer:

The answer is D

Explanation:

and can you pls post a lil more points

pls thanks

4 0
3 years ago
A small child gives a plastic frog a big push at the bottom of a slippery 2.0 meter long, 1.0 meter high ramp, starting it with
lesya692 [45]
First, let's find the angle of inclination using the tangent function.

sin θ = opposite/hypotenuse = 1 m/2 m
θ = 30°

Assuming the ramp is frictionless, the force balance is:
F = mgsinθ = ma
Cancelling out m,
a = gsinθ = (9.81 m/s²)(sin 30°) = 4.905 m/s²

Using the equation for rectilinear motion at constant acceleration,
x = v₀t + 0.5at²
2 m = (6 m/s)(t) + 0.5(4.905 m/s²)(t²)
Solving for tm
t = 0.297 seconds

Using the equation for acceleration:
a = (v - v₀)/t
4.905 m/s² = (v - 6 m/s)/0.297 s
Solving for v,
v = 7.46 m/s
8 0
2 years ago
3) With what other idea of his time was Cuvier's theory of catastrophism most in conflict?
barxatty [35]
<span>uniformitarianism, You should probably create notes or look up more informative sources.</span>
7 0
3 years ago
What is a factor that can stop normal cells from growing?
zmey [24]
In terms of cell division, normal cells differ from cancer cells in at least four ways. Normal cells require external growth factors to divide. When synthesis of these growth factors is inhibited by normal cell regulation, the cells stop dividing.
6 0
2 years ago
Read 2 more answers
What is the purpose of MITOSIS?
Mumz [18]

Answer:

D

Explanation:

A: to create sex cells of reproduction.

This is the purpose of meiosis: a cell division process. It creates gametes, or sperm and eggs.

B. to provide the cells with food

This would be eating for animals, or photosynthesis for plants. When animals eat, it provides their cells with food. When plants photosynthesize, they create their own food in the form of glucose.

C. To give the cell energy

This would be cellular respiration. It turns food and glucose into usable energy called ATP.

D.

This is the correct choice. Mitosis is cell division, which means it creates new cells. This allows organisms to grow and repair.

7 0
3 years ago
Read 2 more answers
Other questions:
  • Whats the outtermost layer of the brain
    5·1 answer
  • For the average young adult female resting in a reclined position, the heart pumps out approximately 5 liters of blood per minut
    6·1 answer
  • An animal cell hat is surrounded by fresh water will burst because the osmotic pressure causes?
    13·2 answers
  • How many of each kind of atom is in one molecules of water
    15·2 answers
  • Certain preparations contain killed or weakened live biological agents that, upon injection into our body, protect the body agai
    13·2 answers
  • Ben was training for a cross-country bicycle race. During his practice run, Ben's tire went flat and he fell off of his bike, cu
    8·2 answers
  • Under what conditions are capsules formed? select one:
    11·1 answer
  • Anorexia nervosa is characterized by the maintenance of unusually low body weight and ____.
    14·1 answer
  • Compare the properties of the parent and daughter cells in mitosis and meiosis and explain the reason for any differences. it ne
    5·1 answer
  • what difference between bacteria and viruses shows that bacteria are living organisms and viruses are not
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!