What is/are the main reason(s) that some places on Earth are warmer than others?
I. Sun stays above the horizon 24 hours a day at some places.
II. The rays of the sun are more direct at some places and more slanting at other places.
CI and II
DNone of these
Refer to the given paragraph where few
words have been italicised. Hormones are produced by organs called endocrine glands. These are ductless glands. Very small quantity of different hormones is required by our body. Thyroxine is secreted when we are stressed or excited. Liver regulates the sugar metabolism in the body by its hormone insulin. Pituitary gland secretes melatonin while parathyroid
glands secrete calcitonin. Select the incorrect option regarding these.
AThyroxine should be replaced by adrenaline.
BLiver should be replaced with pancreas.
CPositions of pituitary and parathyroid should be interchanged.
DPituitary should be replaced by pineal.
Identify the parts labelled as P-T in the given figure and select the correct statement regarding them.
AThe part labelled as P produces male gametes and the part labelled as S produces androgen.
BThe sperms collect and mature in the part R.
CThe parts P and R have no role in reproduction.
DThe part T is located outside the abdominal cavity and protects parts P and Q inside it.
Which of the following statements is not true?
AWool is a natural protein fibre obtained from fleece of animals.
BSilk fibre is produced by the larvae of silkworms from their salivary glands for making a cocoon around them.
CThe quality of silk depends on the rearing (like the quality of leaves fed to the larvae and incubation temperature) and reeling practices followed.
DProcess of washing wool fibre to remove dust and grease is called ginning.