The balloon-shaped structures called tyloses:

1. originate in the lumen of vessels

2. characterise the sapwood

3. are extensions of xylem parenchyma cells into vessels

4. are linked to the ascent of sap through xylem vessels

A non-proteinaceous enzyme is:

1. lysozyme

2. ribozyme

3. ligase

4. deoxyribonuclease

Select the mismatch:

Select the wrong statement:

A cell organelle containing hydrolytic enzyme is:

1. lysosome

2. microsome

3. ribosome

4. mesosome

During cell growth, DNA synthesis takes place in:
1. S phase
2. G₁ phase
3. G₂ phase
4. M phase

Which of the following biomolecules is common to respiration-mediated breakdown of fats, carbohydrates and proteins?

A few drops of sap were collected by cutting across a plant stem by a suitable method. The sap was tested chemically. Which one of the following test results indicates that it is phloem sap?

1.  Acidic

2.  Alkaline

3.  Low refractive index

4.  The absence of sugar

You are given a tissue with its potential for differentiation in an artificial culture. Which of the following pairs of hormones would you add to the medium to secure shoots as well as roots?

1. IAA and gibberellin

2. Auxin and cytokinin

3. Auxin and abscisic acid

4. Gibberellin & abscisic acid

Phytochrome is a:

1. flavoprotein

2. glycoprotein

3. lipoprotein

4. chromoprotein