Mineral Nutrition — BIOLOGY STD 11 Science — Question

From the point of view of evolution, which are the first plants to grow on land in which vascular tissue- xylem and phloem are found?

In Alstonia, the phyllotaxy is called whorled. Why?

In which epidermis of dicotyledon leaves are stomata present?

Correct the statement given below by the right option shown in the bracket against them. The faeces in the rectum initiate a reflex causing an urge for its removal. (neural/ hormonal).

Name the two hormones secreted by the follicular cells of thyroid.

Name the dinoflagellate that causes red tide in the oceans.

Which area decreases during muscle contraction?

What is the term given to multinucleated condition? Explain briefly.

Name the tissue represented by jute fibres used in making ropes.OR
Name the dead elements present in phloem.

Name the main arena of cellular activities in plant and animal cells.