Tissues — Science STD 9 — Question

In a plant cell, structure, support, and protection of the cell are provided by the:

Mitochondria are seats of:

1. Aerobic respiration.
2. Krebs cycle of aerobic respiration.
3. Glycolysis of aerobic respiration.
4. Anaerobic respiration.

What is pulse rate of buffalo/ minute?

1. 6-18/ minute
2. 40-50/ minute
3. 40-60/ minute
4. 70-72/ minute

Which of the following are covered by a single membrane?

Find out the correct sentence about manure.

1. Manure contains large quantities of organic matter and small quantities of nutrients.
2. It increases the water holding capacity of sandy soil.
3. It helps in draining out of excess of water from clayey soil.
4. Its excessive use pollutes environment because it is made of animal excretory waste.

1. (i) and (iii)
2. (i) and (iii)
3. (ii) and (iii)
4. (iii) and (iv)

Photochemical smog is formed by:

1. NO₂
2. SO₂
3. CO₂
4. CO

Define cell.

Whose living cells provide tensile and mechanical strength?

1. Collenchymas.
2. Sclerenchyma.
3. Phloem.
4. Sclereids.

Whichis useful for the study of a typical plant cell?

Plants can be made disease-resistant by: