Explanation

Androecium is the collective term for the male reproductive parts of a flower, called stamens.

Each stamen typically consists of an anther (pollen-producing) and a filament.

Explanation

Xylem transports water and dissolved mineral salts upward from the roots to the leaves.

It plays a key role in plant hydration and nutrient distribution for photosynthesis.

Explanation

Beneficial bacteria in the large intestine, especially E. coli, help synthesize Vitamin K.

This vitamin is essential for blood clotting and maintaining bone health.

Explanation

P(A) is the power set of A = {1, 2}, which includes all subsets: ∅, {1}, {2}, {1, 2}.

So, {2} is one of the subsets, hence it is an element of P(A).

Explanation

Vaccination involves introducing weakened or dead forms of pathogens into the body.

This helps the immune system recognize and fight the real pathogen in the future.

Explanation

Cost per student: 1 3/8 = 11/8

Total amount: 13 3/4 = 55/4

Now, divide the total amount by the cost per student:

Number of students = Total amount ÷ Cost per student

= (55/4) ÷ (11/8)

= (55/4) × (8/11)

= 55 × 2 / 11

= 110 / 11

= 10

Explanation

The third class in the frequency distribution corresponds to the class limits 15-19, and its frequency is given as 50.

Therefore, the frequency of the third class is 50.

Explanation

The sum of the values is calculated as the average multiplied by the number of values: 30 * 4 = 120.

Therefore, the sum of the values is 120.

Explanation

To find the length of marks on dust when the wheel completes one rotation, we need to calculate the circumference of the wheel:

Circumference = π × diameter

= π × 35 cm

≈ 3.14 × 35 cm

≈ 109.9 cm

Rounding to the nearest whole number:

≈ 110 cm

Explanation

The area of a trapezium is given by:

Area = (1/2) × (sum of bases) × altitude

Given:

Area = 153 m^2

Altitude = 9 m

One base = 13 m

Let's denote the other base as 'b'. Then:

153 = (1/2) × (13 + b) × 9

Multiply both sides by 2:

306 = (13 + b) × 9

Divide both sides by 9:

34 = 13 + b

Subtract 13 from both sides:

b = 21