Explanation

A series of mitotic divisions in the zygote is called cleavage, 

This rapidly divides the single-celled zygote into a multicellular structure known as the morula,

Composed of individual blastomeres.

Unlike typical cell division, the embryo's size does not increase during cleavage

Instead, the zygote's volume is divided into smaller cells. 

Explanation

Given:

• Cost Price (CP) = Rs. 500

• Selling Price (SP) = Rs. 700

Step 1: Profit

$$\text{Profit}=SP-CP=700-500=200$$

Step 2: Profit Percentage

Profit %=Profit/CP ​×100
=200/500​×100
$$=0.4\times 100=40\%$$

Explanation

Phenol was first isolated and extracted from coal tar in the 1830s as a by-product of coke manufacture.

Today, the majority of industrial phenol is synthesized from benzene, which is a petroleum-derived feedstock. 

Explanation

Step 1: Total Cost Price (CP)

$$CP=60+80=140$$

Step 2: Selling Price (SP)

$$SP=80$$

Step 3: Profit or Loss

$$text{Profit/Loss} = SP - CP = 80 - 140 = -60$$

This is a loss of Rs. 60, not a profit.

Step 4: Percentage Loss

Loss %=Loss/CP​×100= 60​/140×100

Calculate:

60​/140=0.42857
$$0.42857\times 100=42.857\%\approx 42.86\%$$

Explanation

Explanation

Explanation

The pH of the human body is maintained through several integrated mechanisms

Including:

• Chemical buffer systems,
• The respiratory system
• The renal system.

A blood pH range of 7.35 to 7.45 is essential for proper bodily function; deviations outside this range can lead to acidosis or alkalosis.

Explanation

Diatoms are a type of algae that are classified as "golden algae"

Due to their golden-brown color and the presence of a silica cell wall. 

Blue-green algae:

Blue-green algae, also known as cyanobacteria, are a distinct type of algae characterized by their distinctive blue-green color. 

Green algae:

Green algae are characterized by their green color, which is due to the presence of chlorophyll.

Diatoms do not have the same pigmentation as green algae. 

Red algae: Red algae are classified separately based on their red pigment.

Diatoms are not red algae. 

Explanation

In the cumene process, phenol is produced along with acetone.

This industrial method relies on the co-production of both valuable chemicals, which helps to make the process economically viable. 

Explanation

He goes onto foot.

It combines the idea of direction (to) + position (on).

Onto: Used to show movement toward the surface of something.

"He jumps onto one foot" means he was on two feet and is now landing on a single foot.