STD 11 - 4. Animal kingdom — BIOLOGY STD 11 Science — Question

Lack of which organelle, steroid hormones do not synthesis in animal cell ?

Assertion : In the descending limb of loop of Henle, the urine is hypertonic, whereas in ascending limb of loop of Henle, the urine is hypotonic.
Reason : Descending limb is impermeable to sodium, while ascending limb is impermeable to water.

Failure of thyroid secretion from infancy leading to dwarfism and mental retardation is included under

The endosperm in angiosperms develops from

System of classification that employs numerical data to evaluate similarities and differences is known as:

When xylem and phloem are separated by a strip of cambium it is called

Patella is associated with

Thick-walled and lignified with simple pits in walls and non-prosenchymatous cells without living protoplasm usually isodiametric or irregular in shape are