Plant Kingdom — 17 Biology PYQs with Answers | UKPSC PYQ Hub

Question 1

Which of the following helps some hydrophytes to thrive in wetlands and marshes where water level fluctuates time to time?

Accepted Answer

Aerenchyma tissue. Aerenchyma tissue is a type of tissue found in hydrophytes that helps them survive in areas with fluctuating water levels such as lands and marshes.

Question 2

In the photosynthesis process which of the following gas is used?

Accepted Answer

Carbon dioxide. Green plants carry out photosynthesis, a physic-chemical process by which they use light energy to drive the synthesis of organic compounds. Chlorophyll (green pigment of the leaf), light and Carbon dioxide are required for photosynthesis to occur. Photosynthesis is important for two reasons: it is the primary source of all food on Earth. It is also responsible for releasing of oxygen into the atmosphere by green plants.

Question 3

The transformation of light energy into chemical energy is carried through–

Accepted Answer

Photosynthesis. Photosynthesis is the process by which organisms that contain the pigment chlorophyll convert light energy into chemical energy which can be stored in the molecular bonds of organic molecules.

Question 4

To which of the following chemical groups - Cellulose belongs ?

Accepted Answer

Carbohydrates. Cellulose belongs to a group of polysaccharide Carbohydrates. Carbohydrates are organic compounds comprised of carbon, hydrogen, and oxygen, usually in the ratio of 1:2:1. They are one of the major classes of biomolecules. Polysaccharides are carbohydrates made up of multiple saccharide units.

Question 5

Symptoms of sulphur deficiency in plants are visible first and foremost in–

Accepted Answer

Upper leaves. Sulphur deficiency in plants typically manifests first in the younger, upper leaves. This is because sulphur is not as mobile within the plant as some other nutrients, so newer growth is affected first. Symptoms include yellowing (chlorosis) of the these upper leaves.

Question 6

Which of the following three conditions are most significant for the germination of a seed?

Accepted Answer

Water, Ambient temperature, Oxygen. Water, Ambient temperature, Oxygen are three conditions that are most significant for the germination of a seed. The beginning of the growth of a seed into a seedling is known as germination. All seeds need water, oxygen and the right temperature to germinate. Dormancy is a state of suspended animation in that seeds delay germination until conditions are right for survival and growth.

Question 7

'Red-Rust' disease of tea is a/an:

Accepted Answer

Algal disease. Red rust disease of tea is caused by algae of the genus Cephaleuros. Cephaleuros is a genus of parasitic simple green algae. Red rust of tea is caused by Green Algae.

Question 8

One of the common characteristic of Bryophytes and Pteridophytes is

Accepted Answer

Embryo formation. Bryophytes and Pteridophytes share embryo formation, where the zygote develops into a protected embryo within the parent plant.