Class 4-Science test solved (Making of food and Adaptations in plants)

Answer: Option C

Explanation

Sunken stomata helps the cactus plant to adapt in its habitat. Sunken stomata ensure less water loss, thus reduces the rate of transpiration.

Answer: Option C

Explanation

Water loss from the leaves is called transpiration. 

Most of the water a plant loses is lost due to a natural process called transpirationThe process where plant roots will take up water and then release water vapor through pores (stomata) in the leaves.. Plants have little pores (holes or openings) on the underside of their leaves, called stomataLittle holes in the lower surface of a leaf through which water and gas can move in and out of a plant.. Plants will absorb water through their roots and release water as vapor into the air through these stomata. To survive in drought conditions, plants need to decrease transpiration to limit their water loss.

Answer: Option C

Explanation

Crotons are the plants that have chlorophyll hidden by the red or yellow coloured pigment.

Croton plants have chlorophyll but other red pigments are more in number than the chlorophyll so they are not in green in colour they can perform photosynthesis.

Answer: Option B

Explanation

Some leaves are modified into sensitive thread like structures called tendrils.

Tendrils are present in pea plant. In some plants leaves turn into curved stiff claw like hooks helping in the support.

Answer: Option D

Explanation

The plant shown below is water hyacinth. The roots of this plant are freely floating.