MCQ
The letter 'T' in T-lymphocyte refers to:
- AThyroid
- BThalamus
- CTonsil
- DThymus
Explanation:
T- cell (also called T lymphocyte), is a type of leukocyte that is an essential part of the immune system. 'T' cells originate in the bone marrow and mature in the thymus. In the thymus, T cells multiply and differentiate into helper, regulatory, or cytotoxic T cells. They are then circulated in the blood or lymphatic system. Hence, the letter 'T' means thymus gland.
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$\begin{array}{|l|l|} \hline Column\;-\;I & Column\;-\;II \\ \hline A.\;Caecum\;in\;earthworm & 1.\;Tubular \\ \hline B.\;Caecum\;in\;cockroach & 2.\;Forgut \\ \hline C.\;Gizzard\;in\;earthworm & 3.\;26^{th}\;segment \\ \hline D.\;Gizzard\;in\;cockroach & 4.\;8-9\;segment \\ \hline \end{array}$
$(i)$ Excretion is performed by malphigian tubules.
$(ii)$ They absorb nitrogenous waste products and convert them into uric acid which is excreted out through hindgut.
$(iii)$ In addition, fat body, nephrocytes and urecose glands also help in excretion.