Explanation

In gymnosperms, the ovule is covered by an integument, which is a protective layer.

Explanation

The prothallus of Nephrolepis (a type of fern) is haploid.

The prothallus is haploid, since it grew from a spore which had been formed by meiosis.

It does not have any vascular tissue and uses small rhizoids to anchor it to the ground.

On the underside of the prothallus the sex organs form.

Explanation

Excessive irrigation can lead to the accumulation of salts in the soil, causing salinity.

Salinity causes salt stress in plants.

Prolonged liberal irrigation results in nutrient depletion in the soil so that the plants do not grow properly.

Explanation

Wind-pollinated flowers have a large, feathery stigma in order to trap the airborne pollen grains.

Examples of plants that participate in wind pollination are wheat, rice, corn, and barley.

Explanation

Soil pollution can be caused by various factors including acid rain, ozone, and aerosols.

Explanation

Hatch and Slack Pathway In C4 Plants.

To fix carbon dioxide, this pathway is the alternate to the C3 cycle.

The first formed stable compound – oxaloacetic acid is a 4 carbon compound,hence the name C4 cycle.

This pathway is a common sight in several grasses, maize, sugarcane, amaranthus, sorghum.

Explanation

Natural resistance refers to an organism's inherent ability to resist diseases or pests due to genetic factors.

Explanation

Gibberellins are plant hormones that promote cell elongation, especially in internodal regions.

Explanation

During phase 1 of this cycle, the CO2 molecule is incorporated into one of two 3-phosphoglycerate molecules (3-PGA).

This process requires the enzyme RuBisCO and both ATP and NADPH.

Once 3-PGA is formed, one of two molecules formed continues into the reduction phase (phase 2).

Explanation

 Imbibation is the absorption of water by materials, leading to swelling, such as in door wood during the rainy season.