1 Gita Sloka Every Day - Chapter 14 - Gunatraya Vibhaga Yoga - Sloka 4

The entire content of this mail is from Swami Adidevananda's translation of Ramanuja's  Gita  Bhashya and Swami Chidbhavananda's Bhagavad Gita, both published by Ramakrishna Mission

The next stanza clarifies further

The Process of Birth 3-4

1 Gita Sloka  Every Day - Chapter 14 - Gunatraya Vibhaga Yoga - Sloka 4

Sarva yonishu kaunteya murtayah sambhavanti yah I

Tasam brahma mahat yonih aham beeja pradah pita II sloka 4

सर्व योनिषु कौन्तेय मूर्तयः संभवन्ति याः  I

तासां ब्रह्म महत् योनिः अहं बीज प्रदः पिता II श्लोक 4 

Whatever forms are produced, O Kaunteya, in any wombs whatsoever, the great Brahman (prakriti) is their womb, I the seed-giving father.

The wombs of prakriti are infinitely graded providing scope for all types of beings to sprout forth. The celestials, the human beings, the beasts, birds, insects vegetables, bacteria - all these have their suitable wombs to take birth and thrive The prakriti is the cosmic womb for the entire creation. And Iswara the father. 

How does the prakriti bind the jivas? The process is explained next