Soham investigates the water holding capacity of four different types of soils. He sets up an experiment for each type of soil as shown in the diagram. Soham records his observation in a table.

	Soil type
	Clay	Loam	Sand	Silt
Amount of water added to the soil (ml)	$150$	$150$	$150$	$150$
Amount of water collected in the measuring cylinder (ml)	$30$	$60$	$105$	$50$

Soham added the same amount of water to each type of soil. State one more thing that Soham needs to keep the same in his experiment.

Nisha performs an experiment with two potted plants. She keeps the pots in sunlight and waters them equally. She adds manure to the soil in Pot 1.

She creates a table to record her observations.

What is Nisha investigating?

Nila performs an experiment with two potted plants. She keeps the pots in sunlight and waters them equally. She adds manure to the soil in Pot 1. After a few days, she can see changes in the Pot 1 plant. 

What is Nila investigating?

An experiment was conducted to study the effect of a new fertilizer on the growth of two varieties of wheat. The data for growth of the plants from germination to next 10 days is shown in the figure. All other growing conditions such as water and sunlight were kept the same for both the varieties. Which of the following is the most reasonable conclusion you can draw from the data?

Read the statements given below.

(i) Seeds require moisture for germination.
(ii) Plants can absorb nutrients mostly in dissolved form.
(iii) Irrigation protects crops from both frost and hot air currents.
(iv) Irrigation improves soil texture.

Choose the combination of statements that indicate the need to irrigate crops.

In the given picture of a hoe, the part that is placed on the bullock's neck is