Much like a cell, a virus is able to

Why pollen is important in fertilization?

alexandr402 [8]

Answer:

pollen is important in fertilization because pollen carries male gamete and it helps in transportation of male gamete during fertilization in mainly gymnosperms and angiosperms.

3 0

3 years ago

Soils contain small or trace amounts of many minerals, including the chemical elements phosphorus, calcium, potassium, magnesium

serg [7]

Answer:

Magnesium, calcium, phosphorous, sulfur these are essential nutrients for plants. These are required in trace quantity but are very important for plant life. Point A. will be correct answer.

Explanation:

As in B. starch n cellulose are composed of only carbon, oxygen and hydrogen.

As in C. These elements are not required on special occasion but are necessary throughout plant life.

As in D. C H N O is the primary component plants need but these secondary nutrients are equally necessary for growth n structure of plant.

<u><em>So answer A. Is the correct option.</em></u>

Calcium plays the most important role in structure formation of plants. Also act as messenger molecule in signaling. Deficiency of calcium caused wilting , weakened stem and ultimately death of plant.

Magnesium is the key element in chlorophyll molecule. It is necessary for chlorophyll formation.

Sulfur is another very important element in plant life, it is necessary for protein synthesis in plants.

Phosphorous plays an important role in process of cell devision , photosynthesis and respiration.

Potassium is very crucial in gaseous exchange ,it operates the opening and closing of stomata.

3 0

3 years ago

Can you identify the class of organic molecule to which these molecular structures and examples belong? Part A Sort these items

sattari [20]

There are four classes of organic molecules that are essential to all living organisms.

1. Carbohydrates:

Components: monosaccharides. Functions: energy for cell, raw material, energy storage, and plant cell support Ex: glucose, starch, glycogen, cellulose

2. Lipids (dont form polymers): Components: glycerol, fatty acid, components of a fat molecule Functions: energy storage, cell membrane components, and hormones Ex: fats, phospholipids, and steroids

3. Proteins:

Components: amino group, carboxil group, R group, and amino acid Function: enzyme, structural protein, movement, transport, communication, defense, storage, receive signals Ex: lactose, hair, tendons, muscles, hemoglobin, signal proteins, antibodies, egg albumin, receptor protein

4. Nucleic acids:

Components: phosphate group, nitrogeneous base, ribose or deoxyribose, nucleotide Functions: heredity, DNA

Ex: code for proteins, DNA and RNA

5 0

3 years ago

Ball-and-socket joints allow this gymnast to complete many of the routines that she performs.

AlexFokin [52]

Hip. the shoulder and hip form the only ball an socket joints in the body.

5 0

3 years ago

Read 2 more answers

Based on fossil data, the researcher estimates that humans and their most closely related species in the data set diverged appro

tester [92]

Answer:

Hello your question is incomplete attached below is the complete question

answer : = 1.25

Explanation:

i) Determine the rate of mtDNA percent divergence

From the data given the most closely related specie is Chimpanzee ( 8.8 sequence difference )

Note : Given that this divergence took place seven million years from now

∴The rate of mtDNA percent divergence per 1 millions years

= 8.8 / 7 = 1.25

5 0

3 years ago